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Journal articles on the topic 'EPR spectral measurements'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Gafurov, Marat R., Andrey A. Ponomarev, Georgiy V. Mamin, et al. "Application of pulsed and high-frequency electron paramagnetic resonance techniques to study petroleum disperse systems." Georesursy 22, no. 4 (2020): 2–14. http://dx.doi.org/10.18599/grs.2020.4.2-14.

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The spectral and relaxation characteristics of “free” organic radicals (FR) and vanadyl-porphyrin (VP) complexes in various petroleum disperse systems (PDS) like bitumen, petroleum, their high-molecular components and solutions were studied using stationary (conventional) and pulsed electron paramagnetic resonance (EPR) techniques in two frequency ranges (X- and W-bands, with the microwave radiation frequencies of about 9 GHz and 95 GHz, respectively). The features of the pulsed approaches (electron spin echo, modulation of the electron spin echo signal decay, electronic relaxation times) and

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2

Bansal, Usha, Samta Goyal, and Swati Agrawal. "Synthesis and Spectral Characterization of Mn(II) and Co(II) Complexes with Tetradentate Macrocyclic Ligand." Asian Journal of Chemistry 33, no. 9 (2021): 2207–11. http://dx.doi.org/10.14233/ajchem.2021.23275.

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Manganese(II) and cobalt(II) complexes were synthesized with [N4] tetradentate macrocyclic ligand using different metal salts i.e. MnCl2, Mn(NO3)2, CoCl2 and Co(NCS)2. The ligand was prepared by condensation of glyoxal and carbahydrazide. All these were characterized by elemental analysis, molar conductance measurements, magnetic moment, IR, mass, electronic and EPR spectral studies. Elemental analysis indicates that the complexes have composition MLX2 where (X = Cl–, NO3 –,NCS–). All the complexes were found to be non-electrolytic in nature so can be formulated as [MLX2]. Infrared spectra of

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3

Umendra, Komar, and Chandra Sulekh. "A study on the mononuclear bivalent manganese and copper complexes of twelve membered hexaaza [N6] macrocyclic ligand : Synthesis, spectral and in vitro antifungal screening." Journal of Indian Chemical Society Vol. 88, May 2011 (2011): 647–52. https://doi.org/10.5281/zenodo.5769010.

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Department of Chemistry, J. V. College (C. C. S. University, Meerut), Baraut (Baghpat), Uttar Pradesh, India <em>E-mail</em> : umendra_khokhar@rediffmail.com Department of Chemistry, Zakir Husain College (University of Delhi), J.L.N. Marg, New Delhi-110 002, India <em>E-mail</em> : schandra_00@yahoo.com <em>Manuscript received 21 January 2010, revised 06 May 2010, accepted 06 September 2010</em> New manganese(ll) and copper(II) complexes of 12-membered macrocyclic Schiff base ligand containing thiosemicarbazone moiety have been prepared having general composition IMLX2I where M = Mn<sup>II</su

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4

Gudasi, Kalagouda, Siddappa Patil, Ramesh Vadavi, Rashmi Shenoy, and Manjula Patil. "Synthesis and spectral studies of Cu(II), Ni(II), Co(II), Mn(II), Zn(II) and Cd(II) complexes of a new macroacyclic ligand n,n’-bis(2-benzothiazolyl)-2,6-pyridinedicarboxamide." Journal of the Serbian Chemical Society 71, no. 5 (2006): 529–42. http://dx.doi.org/10.2298/jsc0605529g.

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A new macroacyclic amide ligand N,N?-bis(2-benzothiazolyl)-2,6-pyridinedicarboxamide (BPD), formed by the condensation of 2,6-pyridinedicarbonyldichloride with 2-aminobenzothiazole and its Cu(II), Ni(II), Co(II), Mn(II), Zn(II) and Cd(II) complexes were synthesized. Their structures were elucidated on the basis of elemental analyses, conductance measurements, magnetic moments, spectral (IR, NMR UV-Visible, EPR and FAB) and thermal studies. The complexes exhibit an octahedral geometry around the metal center. Conductance data of the complexes suggested them to be 1:1 electrolytes. The pentadent

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5

Antuzevics, A., A. Fedotovs, and U. Rogulis. "Epr Spectrum Angular Dependences In Liyf4 Crystal / Epr Spektru Leņķiskās Atkarības Liyf4 Kristālā." Latvian Journal of Physics and Technical Sciences 49, no. 6-I (2012): 49–54. http://dx.doi.org/10.2478/v10047-012-0034-0.

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Abstract Electron paramagnetic resonance (EPR) measurements have been made for two perpendicular planes in a LiYF4 crystal before and after x-ray irradiation at room temperature. Analysis of the EPR spectrum angular dependence shows the presence of two defects - an impurity ion, which was embedded during the crystal growth process, and an x-ray induced defect with the g-factor of approx. 2.0. Spectral parameters and possible defect models are discussed.

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6

Kowalkowska-Zedler, Daria, Natalia Nedelko, Katarzyna Kazimierczuk, et al. "Novel tetrahedral cobalt(ii) silanethiolates: structures and magnetism." RSC Advances 10, no. 49 (2020): 29100–29108. http://dx.doi.org/10.1039/d0ra06036d.

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Structural, spectral and thermal properties of three tetrahedral Co(ii) silanethiolates were established by XRD, FTIR for solid samples and TGA. The magnetic properties were investigated by static magnetic measurements and X-band EPR spectroscopy.

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7

Weil, John A., and Brian C. S. Wong. "Energy-level crossing of atomic hydrogen spin states." Canadian Journal of Physics 88, no. 12 (2010): 947–49. http://dx.doi.org/10.1139/p10-075.

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Atomic hydrogen 1H0 has four spin states. It is not well known that the upper two, in its electronic ground state, cross at a sufficiently high externally applied magnetic field Bx (ca. 17 T). The magnetic resonance spectra show particular effects in the crossing region. In the present work, we predict the relevant field-swept spectra at selected fixed frequencies, for 1H0 encapsulated in crystalline alpha-quartz powder, using the known spin Hamiltonian parameters derived from single-crystal EPR measurements. It was found that there is a 5 GHz frequency region in which spectral effects from th

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8

Anitha, C., C. D. Sheela, P. Tharmaraj, and R. Shanmugakala. "Studies on Synthesis and Spectral Characterization of Some Transition Metal Complexes of Azo-Azomethine Derivative of Diaminomaleonitrile." International Journal of Inorganic Chemistry 2013 (January 16, 2013): 1–10. http://dx.doi.org/10.1155/2013/436275.

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New complexes of 2,3-bis(5-(4-chlorophenyl)diazenyl)-2-hydroxybenzylideneamino)maleonitrile (CDHBDMN) with VO(II), Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) were synthesized and characterized by analytical and physicochemical techniques, that is, elemental analyses, molar conductivity, UV, IR, EPR, 1H-NMR spectra, magnetic susceptibility and also by aid of scanning electron microscopy (SEM), nonlinear optical study (NLO), fluorescence spectral studies, and solvatochromic behaviors. Electronic and magnetic susceptibility measurements of the complexes indicate square pyramidal geometry for VO(I

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9

Wackerbarth, Ines, Ni Nyoman Agnes Tri Widhyadnyani, Simon Schmitz, et al. "CuII Complexes and Coordination Polymers with Pyridine or Pyrazine Amides and Amino Benzamides—Structures and EPR Patterns." Inorganics 8, no. 12 (2020): 65. http://dx.doi.org/10.3390/inorganics8120065.

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Isonicotine amide, picoline amide, pyrazine 2-amide, 2- and 4-amino benzamides and various CuII salts were used to target CuII complexes of these ligands alongside with 1D and 2D coordination polymers. Under the criterion of obtaining crystalline and single phased materials a number of new compounds were reliably reproduced. Remarkably, for some of these compounds the ideal Cu:ligand ratio of the starting materials turned out to be very different from Cu:ligand ratio in the products. Crystal and molecular structures from single-crystal XRD were obtained for all new compounds; phase purity was

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10

Charitos, Alexander, Vassilis Tangoulis, John Parthenios, et al. "Monitoring of Fe(II) Spin Transition in Cu(II)-Doped Spin-Crossover Nanoparticles." Molecules 30, no. 6 (2025): 1258. https://doi.org/10.3390/molecules30061258.

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Experimental protocols based on Electron Paramagnetic Resonance (EPR) and Raman spectroscopy are presented for the investigation of the Fe(II) spin transition in Cu(II)-doped 1-D spin-crossover (SCO) nanoparticles of the type [Fe1−xCux(NH2trz)3]Br2 where x = 0.03 and 0.06 and NH2trz = 4-amino-1, 2, 4-triazole. The resulting nanoparticles were characterized using Transmission Electron Microscopy (TEM), Infrared (IR) spectroscopy, and powder X-ray diffraction (p-XRD). Magnetic susceptibility measurements revealed a dependence on the scan rate, with critical temperatures and hysteresis widths var

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11

Chandra, Sulekh, Smriti Raizada, Monika Tyagi, and Archana Gautam. "Synthesis, Spectroscopic, and Antimicrobial Studies on Bivalent Nickel and Copper Complexes of Bis(thiosemicrbazone)." Bioinorganic Chemistry and Applications 2007 (2007): 1–7. http://dx.doi.org/10.1155/2007/51483.

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A series of metal complexes of Cu(II) and Ni(II) having the general composition[M(L)X2]with benzil bis(thiosemicarbazone) has been prepared and characterized by element chemical analysis, molar conductance, magnetic susceptibility measurements, and spectral (electronic, IR, EPR, mass) studies. The IR spectral data suggest the involvement of sulphur and azomethane nitrogen in coordination to the central metal ion. On the basis of spectral studies, an octahedral geometry has been assigned for Ni(II) complexes but a tetragonal geometry for Cu(II) complexes. The free ligand and its metal complexes

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12

Dianu, M. L., A. Kriza, N. Stanica, and A. M. Musuc. "Transition metal M(II) complexes with isonicotinoylhydrazone-9-anthraldehyde." Journal of the Serbian Chemical Society 75, no. 11 (2010): 1515–31. http://dx.doi.org/10.2298/jsc091113121d.

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New complexes of isonicotinoylhydrazone-9-anthraldehyde with Cu(II), Co(II) and Ni(II) have been prepared and characterized by analytical and physico-chemical techniques, such as elemental and thermal analyses, magnetic susceptibility and conductivity measurements, and electronic, EPR and IR spectral studies. The infrared spectral studies revealed the bidentate or monodentate nature of the Schiff base in the complexes; the pyridine nitrogen does not participate in the coordination. A tetrahedral geometry is suggested for the nitrate-complexes and an octahedral geometry for the others. Thermal

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13

Stanila, Andreea, and Sorin Stanila. "Spectroscopic Studies of Aminoacids Complexes with Biometals." Chemistry Journal of Moldova 7, no. 1 (2012): 140–44. http://dx.doi.org/10.19261/cjm.2012.07(1).26.

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The [Cu(L)2]·H2O, [Co(L)2]·2H2O, [Zn(L)2]·H2O complexes with methionine (L) as ligand, were synthesized in water solution and analyzed by means of: elemental analysis, atomic absorption spectroscopy, thermogravimetry, FT-IR, UV-VIS and EPR spectroscopies. The atomic absorption spectroscopy and elemental measurements confi rm the ratio 1:2 metal ion: methionine composition for the synthesised compounds.The IR spectra show that amino acids act as bidentate ligands with coordination involving the carboxylic oxygen and the nitrogen atom of the amino group. Spectral UV-VIS data confi rmed the coval

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14

Nath, P. K., N. C. Mishra, V. Chakravortty, and K. C. Dash. "Spectral, Magnetic and Thermogravimetric Studies of Some Dimeric Oxovanadium(IV) Complexes." Zeitschrift für Naturforschung B 41, no. 11 (1986): 1443–46. http://dx.doi.org/10.1515/znb-1986-1120.

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Abstract The tridentate dibasic Schiff base anthranilic acid salicylideneimine (H2SB) reacts with VOCl2 in the presence o f NaOAc and imidazole (or its derivatives) to form dimeric oxovanadium (IV) complexes of the type [VO(S B)(D)]2. These green or yellow -green compounds have a magnetic moment of 1.4 B.M . at room temperature, and are non-electrolytes in MeOH . The compounds are characterised on the basis of electronic and IR spectra as well as EPR spectroscopy. The IR spectra shows a strong band due to v(V = O) at 880 cm-1 in addition to the bands of H2SB and imidazole. [VO(SB)(Im)]2 shows

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15

Sulekh, Chandra, and Gautam Archana. "Synthesis, spectral characterization and biological screening of a tetraaza-macrocyclic ligand and its complexes with CoII, NiII and CuII." Journal of Indian Chemical Society Vol. 85, Oct 2008 (2008): 980–84. https://doi.org/10.5281/zenodo.5820493.

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Department of Chemistry, Zakir Husain College (University of Delhi), JLN Marg, New Delhi-110 002, India <em>E-mail :</em> schandra_00@yahoo.com <em>Manuscript received 12 March 2008, revised 23 June 2008, accepted 25 June 2008</em> Complexes of cobalt(ll), nickel(ll) and copper(ll) with a 12-membered 1,3,7,9-tetlraaza-4,6,10,12-tetraphenyl-2,8-diketocyclododecane macrocyclic ligand (L) have been synthesized. These complexes are characterized by the elemental analysis, molar conductance measurements, magnetic susceptibility measurements, mass, IR, electronic and EPR spectral studies. All the co

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16

Monika, Tyagi, and Chandra Sulekh. "Chromium(III) and manganese(II) complexes of macrocyclic ligand containing thiosemicarbazide moiety : Spectroscopic and biological studies." Journal of Indian Chemical Society Vol. 89, Feb 2012 (2012): 147–54. https://doi.org/10.5281/zenodo.5751848.

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Department of Chemistry, Zakir Husain College (University of Delhi), 1. L. N. Marg, New Delhi-110 002, India <em>E-mail</em> : schandra_OO@yahoo.com, mnk02tyg@yahoo.co.in Fax : 91-11-232I5906 <em>Manuscript received 09 June 2010, revised 31 May 2011, accepted 20 June 2011</em> Complexes of Cr<sup>III</sup> and Mn<sup>II</sup> were synthesized with a macrocyclic ligand i.e. 5,6,11,12-tetrafuryl-3,8-dithione-1,2,4,7,9,10-hexaazacyclododeca-1,4,6,10-tetraene. The ligand (L) was prepared by [2+2) condensation of furil and thiosemicarbazide. Their structures were determined by the elemental analyse

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17

El‐Boraey, Hanaa A., Randa M. Abdel‐Rahman, Ensaf M. Atia, and Ohyla A. EL‐Gammal. "Synthesis, spectral and thermal studies of new Schiff base copper(II) complexes with their biological effect on Entomopathogenic nematodes." Vietnam Journal of Chemistry 60, no. 2 (2022): 140–56. http://dx.doi.org/10.1002/vjch.202100080.

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AbstractNew Schiff base ligands; (Z)‐1,5‐diphenyl‐2‐((thiophen‐2‐ylmethylene)amino)‐1H‐pyrrole‐3‐carbonitrile (L1); or (Z)‐2‐((2,4‐dihydroxybenzylidene)amino)‐1,5‐diphenyl‐1H‐pyrrole‐3‐carbonitrile (H2L2) and their Cu(II) complexes have been isolated and characterized using elemental analysis, spectral (FT‐IR, 1H NMR, UV/vis, EPR), molar conductivity and magnetic moment measurements, in addition to thermal techniques. FT‐IR spectra established that the Schiff base L1 coordinates as neutral bidentate or tridentate ligand. While the Schiff base H2L2 ligates as neutral or monobasic bidentate liga

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18

Reiss, A., G. Bratulescu, A. Kriza, and N. Muresan. "TRANSITION METAL COMPLEXES OF HETEROCYCLIC LIGANDS. PART VI. COMPLEXES OF 5-HYDROXY-6-MERCAPTO-BENZO[a]PHENAZINE WITH Co(II), Ni(II), Cu(II), Zn(II) AND Cd(II)." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 10, no. 11 (2002): 33–38. http://dx.doi.org/10.48141/sbjchem.v10.n11.2002.34_2002.pdf.

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The paper reports the conclusions about the structure of jive new romp/exes of Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) with the heterocyclic ligand, 5-hydroxy-6-mercapto- benzo[a] phenazine (H2L). These were obtained by elemental analysis, IR, UV-VIS and EPR spectral analysis, conductivity and magnetic susceptibility measurements, and thermal analysis. Bacteriological studies revealed that the ligand and the complexes possess moderate antimicrobial activity.

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19

Matei, Iulia, Cristina Maria Buta, Ioana Maria Turcu, Daniela Culita, Cornel Munteanu, and Gabriela Ionita. "Formation and Stabilization of Gold Nanoparticles in Bovine Serum Albumin Solution." Molecules 24, no. 18 (2019): 3395. http://dx.doi.org/10.3390/molecules24183395.

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The formation and growth of gold nanoparticles (AuNPs) were investigated in pH 7 buffer solution of bovine serum albumin (BSA) at room temperature. The processes were monitored by UV-Vis, circular dichroism, Raman and electron paramagnetic resonance (EPR) spectroscopies. TEM microscopy and dynamic light scattering (DLS) measurements were used to evidence changes in particle size during nanoparticle formation and growth. The formation of AuNPs at pH 7 in the absence of BSA was not observed, which proves that the albumin is involved in the first step of Au(III) reduction. Changes in the EPR spec

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20

Chandra, Sulekh, and Amit Kumar Sharma. "Antifungal and Spectral Studies of Cr(III) and Mn(II) Complexes Derived from 3,3′-Thiodipropionic Acid Derivative." Research Letters in Inorganic Chemistry 2009 (August 23, 2009): 1–4. http://dx.doi.org/10.1155/2009/945670.

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The Cr(III) and Mn(II) complexes with a ligand derived from 3,3′-thiodipropionic acid have been synthesized and characterized by elemental analysis, molar conductance measurements, magnetic susceptibility measurements, IR, UV, and EPR spectral studies. The complexes are found to have [Cr(L)X]X2 and [Mn(L)X]X, compositions, where L = quinquedentate ligand and X=NO3−, Cl− and OAc−. The complexes possess the six coordinated octahedral geometry with monomeric compositions. The evaluated bonding parameters, Aiso and β, account for the covalent type metal-ligand bonding. The fungicidal activity of t

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21

Chandra, Sulekh, and Archana Gautam. "Spectroscopic and biological approach in the characterization of Cr(III), Mn(II) and Co(II) complexes with a novel hexaazamacrocyclic ligand derived from semicarbazide." Journal of the Serbian Chemical Society 74, no. 12 (2009): 1413–22. http://dx.doi.org/10.2298/jsc0912413c.

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Complexes of Cr(III), Mn(II) and Co(II) with a novel 5,7,12,14-tetraphenyl- 1,2,4,8,10,11-hexaazacyclotetradecane-3,9-dione macrocyclic ligand, THTD (L), were synthesized and characterized by elemental analysis, molar conductance and magnetic susceptibility measurements, as well as by mass, 1H-NMR, IR, electronic and EPR spectral studies. Based on the spectral studies, an octahedral geometry was assigned for the Cr(III), Mn(II) and Co(II) complexes. The ligand and its complexes were screened in vitro against some species of bacteria and plant pathogenic fungi. The metal complexes were found to

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Ramgeetha, L., and K. Arunsunai Kumar. "Exploring the DNA Interaction and Antimicrobial Screening of Mixed Ligand Transition Metal(II) Complexes containing Isoniazid-Lawsone Schiff Base: Synthesis, Structural Elucidation and Molecular Docking." Asian Journal of Chemistry 37, no. 6 (2025): 1271–81. https://doi.org/10.14233/ajchem.2025.33699.

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Designing of novel metal-based molecular drugs is an effective approach to fight against the ongoing threat of antimicrobial, anticancer and antioxidant resistance. With this objective, in current work, novel mixed ligand Cu(II), Co(II), Ni(II) and Zn(II) complexes have been designed and prepared by coordinating isoniazid Schiff base as main ligand and lawsone as co-ligand. Moreover, the synthesis of these complexes have been explored with the purpose of creating stable and planar co-ligand (lawsone), thereby investigating their DNA interaction ability and other biological applications. The ge

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23

Shanmugakala, R., P. Tharmaraj, C. D. Sheela, and C. Anitha. "Synthesis and Studies on S-Triazine-Based Ligand and Its Metal Complexes." International Journal of Inorganic Chemistry 2012 (December 17, 2012): 1–7. http://dx.doi.org/10.1155/2012/301086.

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Tridentate chelate complexes of ML type (where M = Cu(II), Ni(II), and Co(II)) have been synthesized from triazine-based ligand 4,6-bis(5-mercapto-1,3,4-thiadiazol-amine)2-phenylamino-1,3,5-triazine (BMTDT). Microanalytical data, magnetic susceptibility measurements, IR, 1H NMR, UV-vis, mass, and EPR spectral techniques were used to characterise the structure of chelates. The electronic absorption spectra and magnetic susceptibility measurements suggest that metal complexes show square pyramidal geometry. The electrochemical behavior of copper(II) complex is studied by cyclic voltammetry. All

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24

Kumar, Umendra, and Sulekh Chandra. "Biological Active Cobalt(II) and Nickel(II) Complexes of 12-Membered Hexaaza [N6] Macrocyclic Ligand Synthetic and Spectroscopic Aspects." E-Journal of Chemistry 7, no. 4 (2010): 1238–45. http://dx.doi.org/10.1155/2010/518723.

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New cobalt(II) and nickel(II) complexes of 12-membered macrocyclic Schiff - base ligand containing thiosemicarbazone moiety as a part of ring have been prepared having general composition [MLX2] where M = Co(II) or Ni(II), L=3,4,9,10–tetra-2-furanyl-1,2,5,6,8,11- hexaazacyclododeca-7,12- dithione - 2,4,8,10 – tetraene, X = Cl-, NO3-, NCS-. The complexes have been characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, spectral (IR, electronic, EPR) techniques and thermal analysis. Spectroscopic studies suggested a six coordinated octahedral geometry for al

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Sulekh, Chandra, Shukla Deepak, and Kumar Gupta Lokesh. "Synthesis and spectroscopic studies of cobalt(II), nickel(II) and copper(II) complexes with N-donor (N4) macrocyclic ligand (DSLF)." Journal of Indian Chemical Society Vol. 85, Aug 2008 (2008): 800–806. https://doi.org/10.5281/zenodo.5819448.

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Department of Chemistry. Zakir Husain College (University of Delhi), JLN Marg, New Delhi-110 002, India <em>E-mail :</em> schandra _ 00@yahoo .com           Fax : 91-11-23215906 <em>Manuscript received 21 January 2008. revised 13 May 2008, accepted 16 May 2008</em> Complexes of Co<sup>II</sup> , Ni<sup>II</sup> and Cu<sup>ll</sup> containing a tetradentate macrocyclic nitrogen ligand have been prepared via template reaction of 2,3-pentanedione, <em>m</em>-phenylenediamine and transition metal ions. The complexes have been characterized on the basis of elemental an

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L., S. Sbirna, Mursesan V., Sbirna S., Mursesan N., and I. Lepadatu C. "Complex compounds of ions with d6-10 electronic configuration with bidentate heterocyclic ligands (N, S)." Journal of Indian Chemical Society Vol. 81, Feb 2004 (2004): 150–52. https://doi.org/10.5281/zenodo.5830169.

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Faculty of Chemistry, University of Craiova, Calea Bucuresti 165, Craiova, Romania <em>E-mail</em> : albatros@dahas.ro        <em>Fax</em>: 3-010-40-51-19-70-48 lnstitute of Physical Chemistry, Romanian Academy, Splaiul Independentei, 202 B Bucharest, Romania <em>Manuscript received 4 December 2002, revised 2 July 2003, accepted 22 August 2003</em> Some new complexes of Fe<sup>II</sup>, Co<sup>II</sup>, Ni<sup>II</sup>, Cu<sup>II</sup> , Zn<sup>II</sup>, Cd<sup>II</sup> and Hg<sup>II</sup> have been synthesized with bidentate heterocyclic ligand (N, S) of the

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Shukla, S., S. Gautam, S. Chandra, and A. Kumar. "SYNTHESIS, SPECTRAL STUDIES, STRUCTURAL EVALUATION AND ANTIMICROBIAL ACTIVITY OF SOME NOVEL C R(III) COMPLEXES CONTAINING TETRADENTATE MACROCYCLIC LIGANDS." INDIAN DRUGS 54, no. 06 (2017): 20–29. http://dx.doi.org/10.53879/id.54.06.10962.

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A string of novel coordination compounds of Cr(III) complexes have been derived and characterized from the macrocyclic ligands (L 1 -L 2 ) carried out by condensation reaction between ligands and the subsequent metal salt. The chemical composition of ligand was determined by analytical and spectral techniques i.e. elemental analysis, IR and Mass spectrocopy. Spectral techniques revealed tetradentate [N 4 ] the nature of ligand and its coordination mode to metal ion through nitrogen donor atoms. Metal complexes were characterized by elemental analyses, molar conductance, magnetic susceptibility

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Sulekh, Chandra, and Kumar Anil. "Synthesis, spectral and physicochemical studies of CoII, NiII and CuII complexes with thiosemicarbazone (L1) and semicarbazone (L2) derived from 2-acetyl thiophene." Journal of Indian Chemical Society Vol. 83, Oct 2006 (2006): 993–98. https://doi.org/10.5281/zenodo.5830869.

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Department of Chemistry, Zakir Husain College, J. L. N. Marg, New Delhi-110 002, India E-mail: schandra_OQ@yahoo.com; anil_sharma957@yahoo.com <em>Manuscript received 18 May 2006, accepted 31 July 2006</em> Co<sup>II</sup>, Ni<sup>II</sup> and Cu<sup>II</sup> complexes are synthesized with thiosemicarbazone (L<sup>1</sup>) and semicarbazone (L<sup>2</sup>) derived from 2-acetyl thiophene. These complexes are characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, mass, IR, electronic and EPR spectral studies. The molar conductance measurements of the compl

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Olalekan, Temitope E., Adeniyi S. Ogunlaja, and Gareth M. Watkins. "SN-Donor Methylthioanilines and Copper(II) Complexes: Synthesis, Spectral Properties, and In Vitro Antimicrobial Activity." Heteroatom Chemistry 2019 (March 3, 2019): 1–7. http://dx.doi.org/10.1155/2019/9203435.

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Methylthioanilines, a series of sulfur-nitrogen donor ligands substituted with OCH3, CH3, Cl, and Br, and their copper(II) complexes have been synthesized and characterized by 1H and 13C NMR, elemental analysis, FTIR, UV-Vis and EPR spectra, molar conductance, and magnetic susceptibility measurements. The NMR spectra of the ligands revealed that the para/ortho protons and para carbon were sensitive to the electronic effect of substituents. The CHNS analysis presented CuLCl2 (L = OCH3, CH3, Cl) and CuL2Cl2 (L = Br) stoichiometries for the copper complexes. FTIR spectra showed that the bidentate

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Belahmar, Ayoub, Mohammed Mikou, and Mohammed El Ghalmi. "Analysis by EPR measurements and spectral deconvolution of the dosimetric properties of lithium formate monohydrate." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 431 (September 2018): 19–24. http://dx.doi.org/10.1016/j.nimb.2018.06.028.

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El-Boraey, Hanaa, Randa Abdel-Rahman, Ensaf Atia, and Khalid Hilmy. "Spectroscopic, thermal and toxicity studies of some 2-amino — 3- cyano — 1, 5 -diphenylpyrrole containing Schiff bases copper (II) complexes." Open Chemistry 8, no. 4 (2010): 820–33. http://dx.doi.org/10.2478/s11532-010-0046-7.

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AbstractTwo novel Schiff base ligands of 2-amino-3-cyano-1,5-diphenylpyrrole and salicylaldehyde (HL1) or 2- hydroxy1-naphthylaldehyde (HL2) and their copper(II) complexes have been synthesized and characterized by elemental analyses, spectral (UV-Vis, IR, EPR, Mass (for ligands)), thermal (DTA-TGA) methods, magnetic and conductance measurements. IR results demonstrate the bidentate binding of the Schiff base ligands involving azomethine nitrogen, phenolic or naphtholic oxygen and suggest the presence of HL2 and complexes (1, 2, 4 and 8) in enolimine-ketonamine tautomeric forms in the solid st

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32

Soumendra, Nath Nandi, Roy Suman, Das Kuheli, Datta Amitabha, and Sinha Chittaranjan. "Synthesis and spectral characterization of some mixed ligand complexes of CuII containing NNS and NN/NO/OO chelating ligands." Journal of Indian Chemical Society Vol. 93, Nov 2016 (2016): 1253–60. https://doi.org/10.5281/zenodo.5639144.

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Inorganic Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata-700 032, India <em>E-mail</em> : c_r_sinha@yahoo.com <em>Fax</em> : 91-033-24137121 Present address : Institute of Chemistry, Academia Sinica, Nankang, Taipei-115, Taiwan <em>Manuscript received 09 August 2016, revised 19 September 2016, accepted 20 September 2016</em> Cu(NN´S)Cl2 (NN´S : 1-alkyl-2-{(o-thioalkyl)phenylazo}imidazole) reacts with some bidentate chelating ligands like, N,N (2,2´-bipyridine, 1,10-phenanthroline), N,O (oxine, picolinic acid) and O,O (salicylic acid, oxalic acid) to

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33

Umendra, Komar, and Chandra Sulekh. "Synthesis, physical characterization of bivalent cobalt and copper complexes of 12-membered quadridentate [N4] macrocyclic ligand." Journal of Indian Chemical Society Vol. 88, Jun 2011 (2011): 853–57. https://doi.org/10.5281/zenodo.5770219.

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Department of Chemistry, J. V College (C. C. S. University, Meerut), Baraut (Baghpat), Uttar Pradesh, India <em>E-mail</em> : uchemkhokhar@gmail.com Department of Chemistry, Zakir Husain College (University of Delhi), JLN Marg, New Delhi-110 002, India <em>E-mail</em>: schandra_00@yahoo.com Fax: 91-11-23215906 <em>Manuscript received 26 July 2010, revised 18 November 2010, accepted 13 December 2010</em> The structures of new cobalt(ll) an copper(ll) complexes derived from 12-membered tetraaza macrocyclic ligand namely dibenzo-[b,g]-5,6,11,12-tetramethyl-1,4, 7,10-tetraazacyclododeca-4, 7-10,12

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34

Sulekh, Chandra, and Gupta Sunita. "Copper(II) complexes with twelve to fourteen membered ring macrocyclic ligands." Journal of Indian Chemical Society Vol. 82, Dec 2005 (2005): 1087–90. https://doi.org/10.5281/zenodo.5823827.

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Department of Chemistry, Zakir Husain College, University of Delhi, J. L. Nehru Marg, New Delhi-110 002, India <em>E-mail</em> : schandra_00@yahoo.com                       <em> Fax</em>: 91-11-23215906 <em>Manuscript received 6 June 2005</em> Copper(II) complexes of general composition Cu(L)X<sub>2</sub> [where L = 3,9-diethyl-2, 10-dimethyl-1 ,4,8, 11-tetraazacyclotetradeca- 1,3,8, 10-tetraene (DSLB); 2,9-diethyl-2,10-dimethyl-1,4, 7, 10-tetraaza-5,6: 11,12-dibenzotricyclo[2,4,4]dodeca-1 ,3, 7 ,9-tetraene (DSLC); 3 ,8-diethyl-2,6,9,

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35

Anitha, C., C. D. Sheela, P. Tharmaraj, and V. V. Hema. "Synthesis, Spectroscopic Characterization, and Biological Activities of Metal Complexes of 4-((4-Chlorophenyl)diazenyl)-2-((p-tolylimino)methyl)phenol." Journal of Chemistry 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/724163.

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Azo Schiff base complexes of VO(II), Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) have been synthesized from 4-((4-chlorophenyl)diazenyl)-2-((p-tolylimino)methyl)phenol (CDTMP). The nature of bonding and the structural features of the complexes have been deduced from elemental analysis, molar conductance, magnetic susceptibility measurements, IR, UV-Vis,1H-NMR, EPR, mass, SEM, and fluorescence spectral studies. Spectroscopic and other analytical studies reveal square-planar geometry for copper, square-pyramidal geometry for oxovanadium, and octahedral geometry for other complexes. The EPR spectr

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36

Chandra, Sulekh, Monika Tyagi, and Moamen Refat. "Spectroscopic, thermal and antibacterial studies on Mn(II) and Co(II) complexes derived from thiosemicarbazone." Journal of the Serbian Chemical Society 74, no. 8-9 (2009): 907–15. http://dx.doi.org/10.2298/jsc0909907c.

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Mn(II) and Co(II) complexes having the general composition [M(L)2X2] (where L = 2-pyridinecarboxaldehyde thiosemicarbazone, M = Mn(II) and Co(II), X = Cl- and - NO3 ) were synthesized. All the metal complexes were characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, mass, IR, EPR, electronic spectral studies and thermogravimetric analysis (TG). Based on the spectral studies, an octahedral geometry was assigned for all the complexes. Thermal studies of the compounds suggest that the complexes are more stable than the free ligand. This fact was supported

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37

Rafat, Fouzia, M. Y. Siddiqi, and K. S. Siddiqi. "Synthesis and characterization of Ni(II), Cu(II) and Co(III) complexes with polyamine-containing macrocycles bearing an aminoethyl pendant arm." Journal of the Serbian Chemical Society 69, no. 8-9 (2004): 641–49. http://dx.doi.org/10.2298/jsc0409641r.

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Reaction of [M(ppn)2]X2 (where M = Cu(II), Ni(II), Co(II) and ppn = 1,3-diaminopropane) with formaldehyde and ethylenediamine in methanol results in the ready formation of a 16-membered macrocyclic complex. The complexes were characterized by elemental analysis, IR, EPR, electronic spectral data magnetic moments and conductance measurements. The Cu(II), Ni(II) and Co(III) complexes are coordinated axially with both pendant groups of the hexadentate macrocycle. These pendant donors are attached to the macrocycle by a carbon chain. The electrical conductivities of the Cu(II) and Ni(II) chelates

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38

Sulekh, Chandra, and Kumar Gupta Lokesh. "Designing and synthesis of macrocyclic Schiff base ligand Study of interaction with MnII, CoII, NiII and Cull and biological screening." Journal of Indian Chemical Society Vol. 82, May 2005 (2005): 454–58. https://doi.org/10.5281/zenodo.5830213.

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Department of Chemistry, Zakir Husain College ( University of Delhi ). J. L. N. Marg, New Delhi- 11 0 002. India <em>E-mail</em>: schandra_OO@yahoo.com; lokesh_kg@rcdillmail.com    Fax: 91-11-23215906 <em>Manuscript received 17 June 2003, revised 28 July 2004, accepted 2 February 2005</em> The synthesis of a tetradentate ligand i.e. 3,4,12,13-tetrapheny1-2,5,11,1-1,19,20-hexaaza tricyclo[13.3.1.1<sup>6-10</sup>]cosa 1(19),2,4,6,8,10(20),11,13,15,17-decaene (L) and its complexes with manganese(II), cobalt(II), nickel(II) and copper(II) have been reported. The complexes are charac

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39

Cyril, A., G. Senthamilselvan, B. Sithi, and A. Dhanalakshmi. "POTENTIALLY ACTIVE METAL OF COBALT, COPPER AND ZINC COMPLEXES DERIVED FROM SCHIFF BASE LIGAND OF 3-ETHOXY-2-HYDROXY-BENZALDEHYDE AND ANILINE FOR THEIR ANTICANCER ACTIVITY." Journal of Advanced Scientific Research 13, no. 02 (2022): 76–84. http://dx.doi.org/10.55218/jasr.202213211.

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New Schiff base transition metal complexes derived from 3-ethoxy-2-hydroxy-benzaldehyde and aniline were characterized by magnetic susceptibility measurements, molar conductance, MS, FT-IR, 1H-NMR, 13C-NMR, Absorbance and EPR spectra. The spectral evidences clearly showed that all the metal chelates distorted octahedral geometry except Zn(II) complex which exist square planar geometry. Electron Spin Resonance (ESR) spectrum of [CuL] complex was coinciding with proposed geometries and other reported complexes. All the synthesized compounds were studied for anticancer studies by MTT method using

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40

Sulekh, Chandra, Jain Deepali, Sarkar Anjana, and Anupama. "Spectroscopic studies and characterization of Nill and Cull complexes with a nitrogen donor new azamacrocyclic ligand with pendent arms." Journal of Indian Chemical Society Vol. 86, Mar 2009 (2009): 220–24. https://doi.org/10.5281/zenodo.5808679.

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Department of Chemistry, Zakir Husain College (University of Delhi), JLN Marg, New Delhi-110 002, India <em>E-mail</em>: schandra_00@yahoo.com Department of Chemistry, D. N. College, Meerut, Uttar Pradesh. India <em>E-mail</em> : deepali 101@yahoo.com NSIT (University of Delhi), Sector-3, Dwarka, Uttar Pradesh, India <em>Manuscript received 17 June 2008. revised 23 September 2008, accepted 12 November 2008</em> The newly synthesised azamacrocyclic ligand L [2,6,12,16,21,22-hexaaza-3,4,5, 13,14, 15-hexamethyltricyclo- [15,3,1,1<sup>7-11</sup>]-docasa-1(2,10,2,5, 7,9,11(22),12,15, 17, 19-decene]

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41

Alan, Ionela, Angela Kriza, Olguta Dracea, and Nicolae Stanica. "New complexes of Co(II), Ni(II), Cu(II) with Schiff base N,N’-bis-(3-methoxy-saliciliden)-3,3’-dimethylbenzidine." Journal of the Serbian Chemical Society 78, no. 7 (2013): 947–57. http://dx.doi.org/10.2298/jsc120613121a.

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The new N,N?-bis-(3-methoxy-saliciliden)-3,3?-dimetilbenzidine (H2L) Schiff base and complexes with Co(II), Ni(II) and Cu(II) of type [M(HL)Cl(H2O)] (M=Co(II), Cu(II)) [M2L(H2O)4]X2 (M=Co(II), X=ClO4 and M=Cu(II), X=NO3) and [M2L(CH3COO)2] (M=Co(II), Ni(II), Cu(II)) were synthesised. The ligand and complexes were characterized by elemental analysis, conductibility measurements, magnetic moments at room temperature, IR, NMR, UV-VIS-NIR, EPR spectra and thermogravimetric analysis. A molar ratio of 1:1 or 1:2 between ligand and metal was determined from the elemental analysis. Except for perchlor

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42

Sulekh, Chandra, and Kumar Anil. "Spectral and physicochemical studies of Ni11 complexes with some nitrogenoxygen and nitrogen-sulphur donor ligands." Journal of Indian Chemical Society Vol. 84, Jan 2007 (2007): 55–58. https://doi.org/10.5281/zenodo.5810349.

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Department of Chemistry, Zakir Husain College, J. L. N. Marg, New Delhi-110 002, India <em>E-mail</em> : schandra_OO@yahoo.com, anil_sharma957@yahoo.com <em>Manuscript received 30 August 2006, accepted 3 November 2006</em> Ni<sup>II</sup> complexes are synthesized with thiosemicarbazones (L<sup>1</sup>, L<sup>3</sup> and L<sup>5</sup>) and semicarbazones (L<sup>2</sup>, L<sup>4</sup> and L<sup>6</sup>) derived from pyrrole-2-carboxyaldchyde, 2-acetyl furan and 2-acetyl thiophene. These complexes are characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, m

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43

Sharma, Yudhvir Singh, Shramila Yadav, and Magan Prasad. "Synthesis, Analytical, and Spectral Studies on Manganese (II) complexes of Redox-active Schiff base Ligands, Bis (2,5-dihydroxyacetophenone) ethylenediamine and Bis (2,5-dihydroxyacetophenone) propylenediamine." Oriental Journal Of Chemistry 40, no. 6 (2024): 1597–602. https://doi.org/10.13005/ojc/400610.

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This study explores the synthesis, analytical characterization, and spectral properties of manganese (II) complexes derived from redox-active Schiff base ligands, specifically bis(2,5-dihydroxyacetophenone) ethylenediamine (DAen) and bis(2,5-dihydroxyacetophenone) propylenediamine (DApn). These ligands were synthesized by condensing 2,5-dihydroxyacetophenone with ethylenediamine and 1,3-propylenediamine, respectively. The resulting manganese (II) complexes were prepared through reactions with Mn(II) salts under controlled conditions. Comprehensive analytical techniques, including elemental ana

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44

Al-Mohaimeed, Amal M., and Asma A. Alothman. "Characterization by Potentiometric Procedures of the Stability Constants of the Binary and Ternary Complexes of Cu(II) and Duloxetine Drug with Amino Acids." Journal of Chemistry 2019 (April 22, 2019): 1–13. http://dx.doi.org/10.1155/2019/1064942.

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Potentiometric titration method has been used to define stoichiometries and stability constants of ternary complexes of Cu(II) with duloxetine (D) and some selected amino acids (L). The protonation constants of the ligands and the stability constants of the binary and ternary complexes of Cu(II) with the ligands were calculated from the potentiometric data using the HYPERQUAD program. The formation constants of the complexes formed in aqueous solutions and their concentration distributions as a function of pH were evaluated at 25°C and ionic strength 0.10 mol·L−1 NaNO3. Respective stabilities

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45

Geetha, R., K. Rajasekar, S. Balasubramaniyan, R. Selvarani, and C. Veeravel. "Cu(II) and Ni(II) Complexes of Bidentate E-N-(4-Isopropyl benzylidene)isonicotinohydrazide: Synthesis, Characterization, DNA Cleavage and Antioxidant Activity." Asian Journal of Chemistry 34, no. 7 (2022): 1693–97. http://dx.doi.org/10.14233/ajchem.2022.23721.

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The reaction of Cu(NO3)2·3H2O and Ni(NO3)2·6H2O with E-N-(4-isopropylbenzylidine)isonicotinohydrazide derived from isonicotinic acid hydrazide with 4-isopropyl benzaldehyde were synthesized and characterized structurally by physico-chemical and spectral techniques. The metal-ligand ratio in metal complexes is in the order of metal:ligand1:ligand2 (1:1:1) indicating the formulae of the complexes as [M(SB)2(NO2)2] (where M = Cu2+ & Ni2+, SB = C16H17N3O). The magnetic moment and electronic spectral data suggest tetragonal geometry for Cu(II) complex and octahedral geometry for Ni(II) complex

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46

Salomanravi, A., R. Nandini Asha, V. Veeraputhiran, and P. Muthuselvan. "NOVEL Co(II) Ni(II) AND Cu(II) COMPLEXES OF TRIDENTATE ONS DONOR SCHIFF BASE LIGANDS: SYNTHESIS, CHARACTERIZATION, DNA CLEAVAGE, MOLECULAR DOCKING, ANTIOXIDANT AND ANTIMICROBIAL STUDIES." Journal of Advanced Scientific Research 13, no. 01 (2022): 167–76. http://dx.doi.org/10.55218/jasr.202213118.

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A new Schiff base ligand 2-((2-furylmethylene)amino)benzenethiol of the type ONS has been synthesized from 2- aminothiophenol and 2-furfuraldehyde and complexed with Co(II), Ni(II) and Cu(II) metal ions. The synthesized ligand and complexes [Co(II),Ni(II) 8Cu(II)] were characterized using various spectral techniques viz., IR, NMR, EI-MS and thermogravimetric analysis. The geometry of the synthesized complexes was confirmed by electronic spectra, magnetic moment measurements and EPR analysis. DNA cleavage studies were performed using Gel electrophoresis method. The antibacterial activity of all

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N., Raman. "Synthesis, spectral characterization, in vitro antimicrobial evaluation and DNA cleavage studies of few macrocyclic complexes." Journal of Indian Chemical Society Vol. 86, Nov 2009 (2009): 1143–49. https://doi.org/10.5281/zenodo.5820689.

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Research Department of Chemistry, VHNSN College, Virudhunagar-626 001, Tamilnadu, India <em>E-mail </em>: drn_raman@yahoo.co.in <em>Manuscript received 19 March 2008, revised 24 June 2009, accepted 3 July 2009</em> Few macrocyclic complexes of the composition, [ML]X [M = Cu<sup>ll</sup>, con, Ni<sup>ll</sup>, Mo<sup>ll</sup>, zn<sup>II</sup>, VO<sup>IV</sup>, Cd<sup>ll</sup> and Hg<sup>ll</sup>; X = Cl<sub>2</sub>/SO<sub>4</sub>] have been designed and synthesized by the template condensation of malonic acid with 4,4'- diaminodiphenylmethane in ethanol medium. All the synthesized complexes

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48

B., S. Manhas, K. Sardana A., and B. Kalia S. "Synthesis of copper(II) toluate adducts with substituted morpholines." Journal of Indian Chemical Society Vol. 80, Aug 2003 (2003): 747–50. https://doi.org/10.5281/zenodo.5835872.

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Department of Chemistry, Punjabi University, Patiala-14 7 002, India Department of Chemistry, H. P. University, Summer Hill, Shimla-171 005, India <em>Manuscript received 1 October 2002, accepted 27 February 2003</em> Some new complexes of Cu(RCOO)<sub>2</sub> (where R = 4-CH<sub>3</sub>C<sub>6</sub>H<sub>4</sub>, 3-CH<sub>3</sub>C<sub>6</sub>H<sub>4</sub> and 2-CH<sub>3</sub>C<sub>6</sub>H<sub>4</sub>) with the saturated diheterocyclic bases (L-L) = 4-methylmorpholine, 4-ethylmorpholine and 2,6 dimethylmorpholine have been synthesized. All the complexes are antiferromagnetic with these bases.

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49

Baligar, Rajesh, and Vidyanand Revankar. "Coordination diversity of new mononucleating hydrazone in 3d metal complexes: synthesis, characterization and structural studies." Journal of the Serbian Chemical Society 71, no. 12 (2006): 1301–10. http://dx.doi.org/10.2298/jsc0612301b.

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The mononucleating hydrazone ligand LH3, a condensation product of salicyloylhydrazine and (2-formylphenoxy)acetic acid, was synthesized and its coordination behavior with first row transition metal(II) ions was investigated by isolating and elucidating the structure of the complexes using elemental analysis, conductivity and magnetic susceptibility measurements, as well as IR, 1H-NMR, electronic and EPR spectral techniques. The ligand forms mononuclear metal(II) complexes of the type [CoLH(H 2O)2], [NiLH(H 2O)2], [CuLH] and [ZnLH]. The ligand field parameters, Dq, B and ? values, in the case

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50

Sykuła, Anna, Adriana Nowak, Eugenio Garribba, et al. "Spectroscopic Characterization and Biological Activity of Hesperetin Schiff Bases and Their Cu(II) Complexes." International Journal of Molecular Sciences 24, no. 1 (2023): 761. http://dx.doi.org/10.3390/ijms24010761.

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The three Schiff base ligands, derivatives of hesperetin, HHSB (N-[2,3-dihydro-5,7-dihydroxy-2-(3-hydroxy-4-methoxyphenyl)chromen-4-ylidene]isonicotinohydrazide), HIN (N-[2,3-dihydro-5,7-dihydroxy-2-(3-hydroxy-4-methoxyphenyl)chromen-4-ylidene]benzhydrazide) and HTSC (N-[2,3-dihydro-5,7-dihydroxy-2-(3-hydroxy-4-methoxyphenyl)chromen-4-ylidene]thiosemicarbazide) and their copper complexes, CuHHSB, CuHIN, and CuHTSC were designed, synthesized and analyzed in terms of their spectral characterization and the genotoxic activity. Their structures were established using several methods: elemental ana

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