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Journal articles on the topic 'Metal Complexing Ligand'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

El-Gahami, Mohamed A., and Maher F. El-Zohry. "Complexing Ability of Some 2-Spirothiazolid-4-one Derivatives." Zeitschrift für Naturforschung B 49, no. 4 (1994): 551–55. http://dx.doi.org/10.1515/znb-1994-0418.

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The complexes of some 2-spirothiazolid-4-one derivatives have been prepared with Cu(II), N i(II), C o(II) and Cd(II) salts. The complexes all have a metal to ligand ratios of 1:1 or 1:2 and are all believed to have tetrahedral structures with chelating ligands. Their structures are suggested on the basis of analysis, X-ray diffraction techniques, spectral (UV-VIS, IR, 1H NMR), and thermal decomposition as well as conductivity measurements. The ligands are coordinated to the metal ions as monovalent bidentate ligands through the OCO groups. Electrical conductivity studies indicated that these c

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2

Wang, Jun, Peng Zhang, Shuai Chen, and Cui Qin Li. "Synthesis and Characterization of Cu(II), Zn(II) Dendritic Metal Complexes." Advanced Materials Research 160-162 (November 2010): 529–35. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.529.

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A new kind of dendritic-salicylaldehydeimine ligand was synthesized with 1.0G polyamidoamine and salicylaldehyde through schiff reaction, and further formed two kinds of dendritic metal complexes by complexing Cu and Zn. The dendritic-salicylaldehydeimine ligand and its metal complexes were characterized by elemental analysis, IR, NMR and UV. The results indicate that two kinds of dendritic metal complexes with stable structure have been synthesized by complexing Cu and Zn, the yield were 88.2% and 65.2% respectively; Intra-molecular hydrogen bond between the hydroxyl H atom of ph-OH and the N

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3

Hussein, Mohammed Bahreldin, Muna Mahdi Mohammed, and Yousif Sulfab. "Synthesis, Characterization And Antimicrobial Study of Pd(II) and Pt(II) complexes of 4-methyl-5-Imidazolecarboxaldehyde Thiosemicarbazone." Scholars International Journal of Chemistry and Material Sciences 6, no. 1 (2023): 1–17. http://dx.doi.org/10.36348/sijcms.2023.v06i01.001.

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Schiff bases are regarded as “privileged ligands” due to their capability to form complexes with a wide range of transition metal ions yielding stable and intensely colored metal complexes. In this study, equimolar amounts of 4-methyl-5-imidazolecarboxaldehyde and thiosemicarbazide were combined and the Schiff base 4-methyl-5-imidazolecarboxaldehyde thiosemicarbazone was prepared as a new bidentate complexing agent. The synthesized ligand was reacted with palladium (II) and platinum (II) ions yielding air-stable complexes. For characterization purpose, mass spectra and x-ray analysis of the li

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4

Limaye, Sudhir N., and Mahesh C. Saxena. "Relative complexing tendencies of O—O, O—N, and O—S donor (secondary) ligands in some lanthanide–EDTA mixed-ligand complexes." Canadian Journal of Chemistry 64, no. 5 (1986): 865–70. http://dx.doi.org/10.1139/v86-143.

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Metal–ligand association constants of 1:1 binary (ML) and 1:1:1 ternary (MAL) complexes of the type [Formula: see text] (where M = La3+, Ce3+, Pr3+, Nd3+, or Sm3+; A = primary ligand = EDTA; L = secondary ligand = O—O, O—N, O—S donor aliphatic or aromatic ligand) have been determined potentiometrically by the Irving–Rossotti titration technique at ionic strength 0.2 (mol dm−3 NaClO4) and 25 °C. Differences between log KML and log KMAL are negative; this may be chiefly due to electrostatic repulsion between the primary binary complex and the incoming secondary ligand during the formation of the

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5

Murray, Hollydawn, Guillaume Meunier, Constant M. G. van den Berg, Rachel R. Cave, and Dagmar B. Stengel. "Voltammetric characterisation of macroalgae-exuded organic ligands (L) in response to Cu and Zn: a source and stimuli for L." Environmental Chemistry 11, no. 2 (2014): 100. http://dx.doi.org/10.1071/en13085.

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Environmental context Identifying the source and stimuli responsible for organic ligands in seawater is crucial to understanding trace metal availability. Voltammetric techniques were employed to characterise the water chemistry of seaweed cultures exposed to low levels of Cu or Zn over 7 days. The results suggest that seaweeds are a potential source of metal complexing ligands and Cu and Zn appear to stimulate ligand production; further research is required to determine if this is applicable to macroalgae and metals outside this study. Abstract It is widely accepted that organic ligands contr

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6

Bagchi, Anindya, Anusree Raha, Prosenjit Mukherjee, et al. "A Statistically Validated Electrochemical (Conductometric) and Spectroscopical Study of Some Metal Ligand Complexes for Prospective Biological Action." Saudi Journal of Medical and Pharmaceutical Sciences 9, no. 02 (2023): 94–128. http://dx.doi.org/10.36348/sjmps.2023.v09i02.006.

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The present electrochemical study deals with the evaluation of a complexation process involving different metal and ligands and its physicochemical properties to find out the ligand- metal ratio of complex in solution. For the determination of complexing nature “Monovariation method” have been used to ascertain the ligand metal ratio in the complex. The stability constant of the formed complexes were calculated by conductance measurement using Modified Job’s method (Turner Anderson Method). The analysis had been carried out by using conductometric principle and the final outcome of the experim

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7

Výprachtický, Drahomír, Věra Cimrová, Stanislav Kukla, and Luďka Machová. "Luminescent Terbium Complexes with Polymer Ligands." Collection of Czechoslovak Chemical Communications 69, no. 2 (2004): 309–21. http://dx.doi.org/10.1135/cccc20040309.

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Alternating and statistical copolymers of 9-vinylcarbazole with diethyl fumarate (1), diethyl maleate (2), methacrylic acid (3), maleic anhydride (4), or maleic acid (5) were synthesized and characterized. These copolymers were tested as polymer ligands, that might be able to suppress the environmental vibronic quenching of a lanthanide ion and, simultaneously, to function as energy donors in the ligand-to-metal energy transfer processes. Time-resolved luminescence of a series of [Tb(III)-ligand] complexes in common and deuterated solvents revealed that the complexing properties of copolymers

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8

Ren, Hongji, Byron Kratochvil, and Xiwen He. "Spectrophotometric determination of free, ionized, metal ion concentrations in solution by an indicator increment method. Application to the determination of free Mg2+ with calmagite." Canadian Journal of Chemistry 73, no. 2 (1995): 296–302. http://dx.doi.org/10.1139/v95-040.

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A spectrophotometric method, called the Indicator Increment Method, is described in which varying amounts of a complexing indicator are added to a sample and the visible spectra recorded after each addition. Through multiple equilibrium calculations the free metal ion concentration, as well as total metal and total ligand concentrations, can be estimated in systems that contain a single metal ion and one ligand. The technique was tested successfully for the determination of free magnesium in the presence of NTA, phosphate, or oxalate using calmagite as indicator. The method requires the approx

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9

Hussein, Mohammed Bahreldin, Muna Mahdi Mohammed, Abdalla Gobara, Asha Fadllallah Wady, and Awad Salim Ibrahim Holy. "Synthesis, characterization, and antimicrobial activity of 4-imidazolecarboxaldehyde thiosemicarbazone and its Pt(II) and Pd(II) complexes." European Journal of Chemistry 12, no. 1 (2021): 56–59. http://dx.doi.org/10.5155/eurjchem.12.1.56-59.2070.

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Schiff bases are versatile ligands, synthesized via condensation of primary amines with carbonyl compounds. In this study, equimolar amounts of 4-imidazolecarboxaldehyde and thiosemicarbazide were combined and the Schiff base 4-imidazolecarboxaldehyde thiosemicarbazone was prepared as a new bidentate complexing agent. The synthesized ligand was reacted with palladium (II) and platinum (II) ions yielding air-stable complexes. For characterization purpose, infrared spectra, mass spectra, electronic spectra, thermal analysis, proton nuclear magnetic resonance and 13-carbon nuclear magnetic resona

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10

(Miss), Shailey Gupta, and N. Ansari M. "Complexing behavior of 2-amino-4-benzamidothiosemicarbazide towards some 3d-metals." Journal of Indian Chemical Society Vol. 80, Oct 2003 (2003): 907–8. https://doi.org/10.5281/zenodo.5839328.

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Department of Chemistry, S. D. (P. G.) College, Muzaffarnagar-251 001, India <em>Fax ; </em>91-0131-2602354 <em>Manuscript received 15 March 2002, revised 1 April 2003, accepted 13 June 2003</em> Some new complexes of Mn<sup>II</sup>, Fe<sup>lII</sup>, Co<sup>II</sup>, Ni<sup>II</sup> and Cu<sup>II</sup> have been synthesized with 2-amino-4-benzamidothiosemicarbazide. All the complexes have 1 : 2 metal-ligand ratio with non-ionic nature except the Fe<sup>III</sup> complex, which is 1 : 1 electrolyte. All are found to be paramagnetic high spin complexes with octahedral geometry involving <em>sp

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11

Rita Aparecida Dutra, Maria Isabel Cristina Batista Mayrink, Gabriel Henrique Sperandio, Iterlandes Machado Junior, Alexsandro Antônio Matias, and Efraim Lázaro Reis. "Didactic experiment for voltametric determination the complexing capacity of natural waters." World Journal of Advanced Engineering Technology and Sciences 11, no. 1 (2024): 337–44. http://dx.doi.org/10.30574/wjaets.2024.11.1.0069.

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The titration method can be applied to determine the complexation capacity between metal ions and ligands in natural water samples. The process involves the incremental addition of the metal to the sample containing a specific ligand, resulting in a titration curve that reflects the formation of complexes. The change in the curves slope indicates the saturation of the complexation capacity. In this study, the copper (II) ion was used due to its stability with organic ligands. The titration curve was analyzed to determine the complexation capacity (CC) and conditional formation constant (K) of

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12

T., Manikanda Kumaran, Jothilakshmi S., and Rekha S. "Influences of bath chemistry and complexing agent on plating rate in electroless copper methane sulphonate bath." Journal of Indian Chemical Society Vol. 97, No. 11b, Nov 2020 (2020): 2427–32. https://doi.org/10.5281/zenodo.5656266.

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R&D, Bharathiar University, Coimbatore-641 046, Tamil Nadu, India RMK College of Engineering and Technology, Puduvoyal, Chennai-601 206, India RMD Engineering College, Kavaraipettai, Chennai-601 206, India <em>E-mail</em>: rekhaperichiappan@gmail.com <em>Manuscript received online 12 October 2020, revised and accepted 27 November 2020</em> In electroless bath the ingredient which can change the kinetics of the plating process is called a complexing agent. The complexing agent slows down the rate of deposition and improves the deposit qualities. Dietheylene triamine pentaacetic acid (DTPA)

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13

Denizli, Adil, Bora Garipcan, Abdülkerim Karabakan, Rıdvan Say, Sibel Emir, and Süleyman Patır. "Metal-complexing ligand methacryloylamidocysteine containing polymer beads for Cd(II) removal." Separation and Purification Technology 30, no. 1 (2003): 3–10. http://dx.doi.org/10.1016/s1383-5866(02)00094-1.

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14

Oruma, Uchechukwu Susan, Pius Oziri Ukoha, Nkechinyere Nwanneka Ukwueze, et al. "Synthesis, Biological and In Silico Studies of (1H-Indol-3-ylmethylene)-naphthalen-1-ylamine and its Os(VIII), Pd (II), Ni(II), Cr (III) and Fe(III) Complexes." Oriental Journal Of Chemistry 40, no. 6 (2024): 1715–22. https://doi.org/10.13005/ojc/400624.

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(1H-Indol-3-ylmethylene)-naphthalen-1-ylamine, INDNA was synthesized by the condensation of 1- naphthylamine with indole-3-carboxaldehyde. Additionally, the complexes of Os(VIII), Pd (II), Ni(II), Cr (III) and Fe(III) were synthesized. ESI-MS spectroscopic techniques, 1H and 13C NMR, UV-VIS, IR and elemental analysis were used to characterize the ligand and metal complexes. According to spectral data, INDNA binds as a bidentate ligand to the metal ions via the nitrogens in the imine and indole chains. The ligand to metal stoichiometry of the compounds is 2:1. The metal complexes exhibit tetrah

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15

G., N. MUKHERJEE, and SEN A. "A Study of some Sulphonamidobenzimidazoles (BzH) as Metal Complexing Ligands. Part-III. Equilibrium Study of the Formation of Ternary M( Glycinate )(Bz) Complexes with Cobalt(II), Nickel(II), Copper(II) and Zinc(II)." Journal of Indian Chemical Society Vol. 64, Jun 1987 (1987): 325–30. https://doi.org/10.5281/zenodo.6236978.

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Department of Chemistry, University College of Science, 92 Acharya Prafulla Chandra Road, Calcutta-700 009 <em>Manuscript received 19 March 1986, revised 19 August 1986, accepted 19 May 1987</em> Equilibrium study of the ternary interaction of Co<em><sup>II</sup>, </em>Ni<em><sup>II</sup>, </em>Cu<em><sup>ll</sup></em> and Zn<em><sup>II</sup></em>  ions with glycinate (Gly<sup>-</sup>) as the primary ligand and a few sulphonamidobenzimidazoles (BzH), <em>viz. </em>2-<em>N</em>-benzenesulphonylaminomethylbenzimidazole (SMBzH), 2-<em>N</em>-benzenesulphonylaminoethylbenzimidazole

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16

M., Sivasankaran Nair, Ravi Samuel Raj C., Arish D., and Sudha Kumari S. "Molecular modeling and potentiometric study of some metal complexes of o-vanilineglutamate Schiff base." Journal of Indian Chemical Society Vol. 87, Jun 2010 (2010): 729–34. https://doi.org/10.5281/zenodo.5791931.

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Department of Chemistry, Manonmaniam Sundaranar University, Tirunelveli-627 012, Tamilnadu, India <em>E-mail :</em> msnairchem@rediffmail.com <em>Manuscript received 26 June 2009, revised 6 November 2009, accepted 17 November 2009</em> The complexing behaviour of <em>o</em>-vanilineglutamate Schiff base ligand with Co<sup>II</sup> , Ni<sup>II</sup> , Cu<sup>II</sup> and Zn<sup>II</sup> were investigated by semiempirical (AMI), molecular mechanics (MM +) and potentiometric methods. The results demonstrate that the Schiff base ligand is tertradentate in the MAB complexes. Both the molecular mode

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17

Şahin, Deniz, and Senay Tascıoglu. "Removal of Pb(II) ions from aqueous solution using complexation-ultrafiltration." Polish Journal of Chemical Technology 20, no. 2 (2018): 80–84. http://dx.doi.org/10.2478/pjct-2018-0026.

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Abstract Ligand-modified micellar-enhanced ultrafiltration (LM-MEUF) is a membrane technique based on a separation process which can be used for removal of target metals from an aqueous solution. This method involves adding both a metal complexing ligand and surfactant molecule to the aqueous solution under conditions where most of the molecules are present as micelles. This ligand can be attached to the surface of micelles by solubilization and forms the ligand complexes with the metal ion. The aqueous solution is then treated through a membrane which has to be smaller pore sizes than those o

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18

Smith, E. H., and S. Chatterjee. "Impact of solution variables on the removal of heavy metals from wastewaters by a recycled iron sorbent." Water Science and Technology 42, no. 1-2 (2000): 347–52. http://dx.doi.org/10.2166/wst.2000.0337.

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Waste shot-blast fines from surface finishing processes have been demonstrated to be effective for removing heavy metals from solution by adsorption.The technology offers the potential for inexpensive recovery and reuse of a material normally discarded as a solid waste. While metal removals compare favorably with those achieved by commercial sorbents, applications issues such as the impact of background metal-complexing agents require investigation. The presence of oxalic acid, a complexing organic compound, impacted cadmium and lead adsorption in accordance with predictions from metal speciat

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19

Leffek, Kenneth T., and Arnold Jarczewski. "Study of the properties of pyridine-2-azo-p-phenyltetramethylguanidine as a metal ion complexing agent." Canadian Journal of Chemistry 69, no. 8 (1991): 1238–44. http://dx.doi.org/10.1139/v91-185.

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Pyridine-2-azo-p-phenyltetramethylguanidine (PAPT) was synthesized and the properties of this compound examined. The dissociation constants of the conjugate acids in H2O are [Formula: see text] and [Formula: see text] at 25 °C at I = 0.1, and in acetonitrile are [Formula: see text] and [Formula: see text]. The properties of metal–ligand chelates in acetonitrile have been examined and the stability constants for Ni2+, Co2+, and Zn2+ complexes measured. The rates of reaction of PAPT with Ni2+, Co2+, and Zn2+ in acetonitrile have been determined and the activation parameters measured for the comp

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20

Sharma, N., V. K. Vashistha, and U. R. Sharma. "Computer Assisted Thermal Complexation Studies of Vanadium with Benzodiazepine Drugs." Asian Journal of Chemistry 31, no. 10 (2019): 2351–56. http://dx.doi.org/10.14233/ajchem.2019.21998.

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The complexing tendency of vanadium with nifoxipam and lorazepam were carried out by pH metric titration technique in aqueous acid media at different temperatures (298, 308 and 318 K) and an ionic strength of 0.2 M. The degree of complexation was investigated at different pH values. Potentionmetric measurement of hydrogen ion concentration was also studied with the degree of complex formation. The proton-ligand and metal-ligand stability constants were resolved by modified Calvin-Bjerrum pH titration technique (Irving and Rossitti) using computer programming. The important thermodynamic parame

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21

Hussein, Tasneem Ibrahim, Musa Abduelrahman Ahmed, Ismail Adam Arbab, et al. "Synthesis, characterization and biological activity of a Schiff base derived from o-amino benzoic acid and its Co(II), Cd(II) and Ni(II) complexes." European Journal of Chemistry 11, no. 1 (2020): 15–20. http://dx.doi.org/10.5155/eurjchem.11.1.15-20.1941.

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Equimolar amounts of imidazoleacetophenone and 2-aminobenzoic acid were combined together and the Schiff base 4(1H-imidazole-yl)acetophenoneanthranilic acid was prepared as a new bidentate complexing agent. The synthesized ligand was reacted with cobalt(II), cadmium(II), and nickel(II) ions yielding air stable complexes. For quantification and characterization purposes, elemental analysis, infrared spectra, electronic spectra, proton nuclear magnetic resonance spectra and mass spectra studies were carried out on the obtained complexes and ligand. Thermogravimetric analysis and magnetic suscept

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22

Merola, Joseph S., та Arthur W. Grieb. "Crystal structure of chlorido(η2-phenyl isothiocyanate-κ2C,S)-mer-tris(trimethylphosphane-κP)iridium(I)". Acta Crystallographica Section E Structure Reports Online 70, № 11 (2014): 352–54. http://dx.doi.org/10.1107/s160053681402162x.

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The molecule of the title compound, [IrCl(C7H5NS)(C3H9P)3], is a distorted octahedral iridium complex with three PMe3ligands arranged in a meridional geometry, a chloride ioncisto all three PMe3groups and the phenyl isothiocyanate ligand bonded in an η2-fashion through the C and S atoms. The C atom istransto the chloride ion and the S atom is responsible for a significant deviation from an ideal octahedral geometry. The geometric parameters for the metal-complexing phenyl isothiocyanate group are compared with other metal-complexed phenyl isothiocyanates, as well as with examples of uncomplexe

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23

Amigoni-Gerbier, Sonia, Sylvain Desert, Thadée Gulik-Kryswicki, and Chantal Larpent. "Ultrafine Selective Metal-Complexing Nanoparticles: Synthesis by Microemulsion Copolymerization, Binding Capacity, and Ligand Accessibility." Macromolecules 35, no. 5 (2002): 1644–50. http://dx.doi.org/10.1021/ma0113632.

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24

Radaelli, Marta, Elisa Scalabrin, Giuseppa Toscano, and Gabriele Capodaglio. "High Performance Size Exclusion Chromatography-Inductively Coupled Plasma-Mass Spectrometry to Study the Copper and Cadmium Complexation with Humic Acids." Molecules 24, no. 17 (2019): 3201. http://dx.doi.org/10.3390/molecules24173201.

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Dissolved organic matter (DOM) plays an important role in the environment by influencing the transport and distribution of organic and inorganic components through different processes: the retention, mobilization, and bio-availability of potentially toxic elements (PTEs). The aim of the present study is to examine the dimensional characterization of humic acids (HA) extracted from soil matrix, as well as to analyze the metal distribution among different ligand classes. The molecular size distribution of the HA extract from soil showed three dimensional classes: 52 KDa, 4.5 KDa, and 900 Da. HPS

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Godwin, J., L. S. Tella, A. N. Ebelegi, and N. Ayawei. "Acids and Anions Effects on the Distrubution of Cadmium Between Buffered Aqeuous Phases and 4,4´-(1e,1e´)-1,1´-(Ethane-1,2-Diylbis (Azan-1-Yl-1ylidene)) Bis(5-Methyl-2-Phenyl-2,3-Dihydro-1h-Pyrazol-3-Ol) Solutions." Oriental Journal of Chemistry 35, no. 6 (2019): 1702–11. http://dx.doi.org/10.13005/ojc/350611.

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The effect of some acids, anions and auxiliary complexing agents on the extraction of Cadmium (II) from aqueous solutions buffered to pH 7.5 using a chloroform solution of the Schiff base ligand 4,4´-(1E,1E´)-1,1´-(ethane-1,2-diylbis(azan-1-yl-1ylidene))bis(5-methyl-2-phenyl-2,3-dihydro-1H-pyrazol-3-ol) (H2BuEtP) alone and in the presence of 1-(3-hydroxy-5-methyl-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl) butan-1-one (HBuP) after an equilibration time of sixty minutes was investigated. Working concentration of Cd(II) was 50mgL-1, while a range from 0.001M-3.0M was used for acid and 0.001M-1.0M for

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Malesev, Dusan, and Vesna Kuntic. "Investigation of metal-flavonoid chelates and the determination of flavonoids via metal-flavonoid complexing reactions." Journal of the Serbian Chemical Society 72, no. 10 (2007): 921–39. http://dx.doi.org/10.2298/jsc0710921m.

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Flavonoids constitute a large group of polyphenolic phytochemicals with antioxidant properties which are overwhelmingly exerted through direct free radical scavenging. Flavonoids also exhibit antioxidant properties through chelating with transition metals, primarily Fe(II), Fe(III) and Cu(II), which participate in reactions generating free radicals. Metal-flavonoid chelates are considerably more potent free radical scavengers than the parent flavonoids and play a prominent role in protecting from oxidative stress. To unravel the origin of their potent biological action extensive physico-chemic

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Minazzi, Paolo, Luciano Lattuada, Ivan G. Menegotto, and Giovanni B. Giovenzana. "Enzymatic Approach to Bifunctional Chelating Agents." Org Biomol Chem. 12, no. 35 (2014): 6915–21. https://doi.org/10.1039/c4ob00810c.

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Bifunctional chelating agents (BFCAs) combine the complexing properties of a multidentate ligand with the presence of a free reactive functional group, mainly devoted to conjugation purposes. Indeed, products obtained by conjugation of a BFCA to a biomolecule and coordination of a suitable metal ion are widely applied in medicine nowadays as diagnostic and therapeutic agents. BFCAs are generally prepared through multi-step syntheses and with extensive application of protection-deprotection strategies, due to the large number of functional groups involved. Hydrolytic enzymes, with their unique

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Bala, Madhu, and L. K. Mishra. "Complexing Behaviour and Antifungal Activity of N-[(1E)-1-(1H-Benzimidazol-2-yl)ethylidene]morpholine-4-carbothiohydrazide and Related Ligand with Metal Ions." International Journal of Inorganic Chemistry 2014 (April 22, 2014): 1–10. http://dx.doi.org/10.1155/2014/902575.

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The coordination complexes of bivalent metal ions with N-[(1E)-1-(1H-Benzimidazol-2-yl)ethylidene]morpholine-4-carbothiohydrazide (H2bmctz, H2L-1) and N-[(1E)-1-(1H-Benzimidazol-2-yl)(phenyl)methylidene] morpholine-4-carbothiohydrazide (H2bpmctz, H2L-2) were prepared and their neutral, monoanionic, and dianionic forms of ligands of compositions [M(H2L)X2] (M=CoII, NiII, CuII, ZnII, CdII, or PdII, X=Cl− or Br−, and H2L=H2L-1 or H2L-2), [M(HL)2]nH2O where (M=CoII, CuII, MnII, NiII, ZnII or CdII, H2L=H2L-1 or H2L-2, and n = 0 or 2), and [MLB]nB (M=CuII, NiII, ZnII, CdII, or PdII, B=H2O, Py, or Y-

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Golikov, Alexey, Yuliya Privar, Denis Balatskiy, Natalia Polyakova, and Svetlana Bratskaya. "Extended Rate Constants Distribution (RCD) Model for Sorption in Heterogeneous Systems: 4. Kinetics of Metal Ions Sorption in the Presence of Complexing Agents—Application to Cu(II) Sorption on Polyethyleneimine Cryogel from Acetate and Tartrate Solutions." International Journal of Molecular Sciences 24, no. 15 (2023): 12385. http://dx.doi.org/10.3390/ijms241512385.

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Here, we report a new version of the extended Rate Constants Distribution (RCD) model for metal ion sorption, which includes complex-formation equilibria. With the RCD-complex model, one can predict sorbent performance in the presence of complexing agents using data on metal ion sorption from ligand-free solutions and a set of coefficients for sorption rate constants of different ionic species. The RCD-complex model was applied to breakthrough curves of Cu(II) sorption from acetate and tartrate solutions on polyethyleneimine (PEI) monolith cryogel at different flow rates and ionic speciation.

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Pardi, Hilfi, Friska S. Silitonga, Eka P. Ramdhani, and Dina Fitriyah. "Voltammetric Study for Determination of Non-essential Metal Cd(II) in water samples (River and Sea) using Eriochrome Blue Black R as Complexing." E3S Web of Conferences 324 (2021): 01001. http://dx.doi.org/10.1051/e3sconf/202132401001.

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The research on the determination of Cd(II) metal in river and seawater samples using the Adsortive Cathodic Stripping Voltammetry (AdCSV) method has been done. In order to increase the sensitivity and selectivity of Cd(II) measurement, it is necessary to determine the optimum condition for the variation of potential ligand accumulation, accumulation time, pH and optimum ligand concentration. It is also determined the accuracy and precision of the method used by determining the value of the relative standard deviation (SDR), as well as the recovery value. The result obtained is chalcone as the

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Citron, Irvin M., Patrick M. Hanlon, and Stephen Arthur. "Ultraviolet Spectroscopic Determination of Five Lanthanide Elements without Prior Separation." Applied Spectroscopy 47, no. 6 (1993): 764–72. http://dx.doi.org/10.1366/0003702934067027.

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This investigation has resulted in an analytical method for the quantitative determination of total lanthanide concentration in aqueous solution by absorbance at 240 nm in the ultraviolet followed by quantitative determination of individual lanthanide ion concentrations by the use of concentration-responsive absorption peaks in the 190–235 nm region. The 240-nm peak is present and is proportional to concentration regardless of the ligand employed to complex the lanthanides (including H2O). The individual lanthanide/ligand peaks in the 190–235 nm region were selected on the basis of their separ

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Moussa, Ziad, Harbi Tomah Al-Masri, Amjed Shraim, and Mohammed Fettouhi. "{[2-Methyl-2-(phenoxymethyl)propane-1,3-diyl]bis(oxy)}dibenzene." Acta Crystallographica Section E Structure Reports Online 70, no. 5 (2014): o539. http://dx.doi.org/10.1107/s1600536814007594.

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The title compound, C23H24O3, was obtained in a one-step (60% yield) synthesis from 1,1,1-tris(hydroxymethyl)ethane. It features a tripodal ligand capable of complexing metal centres. One of the three conformations involving the methyl group, the central C—C bond and the phenoxy substituents is antiperiplanar while the two others are synclinal [the corresponding C—C—C—O torsion angles are −174.6 (1), −53.2 (2) and −47.3 (2)°]. In the crystal, C—H...O interactions link the molecules into [010] chains.

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33

Georgieva, Stela, Petar Todorov, Desislava Staneva, Petar Grozdanov, Ivanka Nikolova, and Ivo Grabchev. "Metal–Peptide Complexes with Antimicrobial Potential for Cotton Fiber Protection." Journal of Functional Biomaterials 14, no. 2 (2023): 106. http://dx.doi.org/10.3390/jfb14020106.

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A study of the formation of copper (II) complexes with hemorphin peptide motifs in alkalic water solutions is presented. The effect of the peptide ligand on the complexing properties of the Cu (II) ion was quantified by giving the stoichiometry and stability of the complex compounds in the medium in which they are formed using voltammetric (cyclic) and spectral (UV-Vis and fluorimetric) analytical techniques. The resulting complexes were examined via IR spectroscopy to detect M-N and M-O oscillations and using the EPR approach in solution and in the solid phase to view the coordination and lig

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34

Suman, Malik, and Wankhede Sonal. "Synthesis, spectral characterization, thermal decomposition and diuretic study of cobalt(II) and nickel(II) complexes with 4-chloro-N-(2-furfuryl)-5- sulfamoyl anthranilic acid." Journal of Indian Chemical Society Vol. 91, Dec 2014 (2014): 2173–77. https://doi.org/10.5281/zenodo.5744906.

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Sadhu Vaswani P.G. College, Bairagarh, Bhopal-462 030, Madhya Pradesh, India <em>E-mail</em> : sonal2107@gmail.com <em>Manuscript received online 01 July 2014, revised 02 July 2014, accepted 03 July 2014</em> The biological activity of many drugs has been seen to be improved on complexing with metal ions, subsequently promoting their use in pharmacology. The present work deals with the synthesis of metal complexes derived from diuretic drug furosemide and its physico-chemical analysis to find out ligand-metal ratio in solution. Metal complexes of Co<sup>II</sup> and Ni<sup>II</sup> have been s

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35

Garnier, C., S. Mounier, and J. Y. Benaïm. "Metal Logarithmic Scale Titration as a Tool for Complexing Ligand Distribution Determination : an Application by DPASV." Environmental Technology 25, no. 5 (2004): 589–99. http://dx.doi.org/10.1080/09593330.2004.9619349.

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Kholin, Yuriy, and Vladimir Zaitsev. "Quantitative physicochemical analysis of equilibria on chemically modified silica surfaces." Pure and Applied Chemistry 80, no. 7 (2008): 1561–92. http://dx.doi.org/10.1351/pac200880071561.

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Quantitative physicochemical analysis (QPCA) enables the determination of the stoichiometric compositions and physicochemical parameters of species in equilibrium systems proceeding from the composition-property dependencies. The paper discusses modifications to the routine QPCA procedures required to characterize properties of reagents fixed on surfaces of silica-organic hybrid materials. The cooperative effects and the energetic heterogeneity of fixed reagents are especially important in this context. It follows that the main peculiarities of silica surfaces chemically modified by aliphatic

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G., N. MUKHERJEE, and SEN A. "Studies on some Sulphonamidobenzimidazoles as Metal Complexing Ligands. Part-I. Cobalt(II), Nickel(II) and Copper(II) Complexes of 2-(1′-Benzenesulphonylamino-3′- methylmercapto)propylbenzimidazole." Journal of Indian Chemical Society Vol. 62, Oct 1985 (1985): 717–20. https://doi.org/10.5281/zenodo.6322440.

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Chemistry Department, University College of Science, 92 Acharya Prafulla Chandra Road, Calcutta-700 009 <em>Manuscript received 30 March 1984, accepted 29 October 1985</em> The newly synthesised sulphonamidobenzimidazole, 2-(1'-bentenesulphonylamino-3<em>'</em>-methylmercapto)propylbenzimidazole (BMPBzH), functioned as a (N, N, S) terdentate ligand to form strongly paramagnetic octahedral cobalt(II) complex, Co(BMPBz),, while with nickel(II) and copper(II) it functioned as a (N, N) bidentate ligand to form square planar diamagnetic Ni(BMPBz), and distorted octahedral paramagnetic

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38

Wang, Adele Qi, and Teresa D. Golden. "Electrodeposition of Oriented Cerium Oxide Films." International Journal of Electrochemistry 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/482187.

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Cerium oxide films of preferred orientation are electrodeposited under anodic conditions. A complexing ligand, acetate, was used to stabilize the cerium (III) ion in solution for deposition of the thin films. Fourier transform infrared spectroscopy showed that the ligand and metal tended to bind as a weakly bidentate complex. The crystallite size of the films was in the nanometer range as shown by Raman spectroscopy and was calculated from X-ray diffraction data. Crystallite sizes from 6 to 20 nm were obtained under the anodic deposition conditions. Sintering of the (111) oriented films showed

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G., Valli, Sivakolunthu S., Muthusubramanian S., and Sivasubramanian S. "Synthesis and biological activity of copper(II) mixed ligand complexes with thiophene-2-aldehyde thiosemicarbazone as the primary ligand." Journal of Indian Chemical Society Vol. 77, May 2000 (2000): 252–53. https://doi.org/10.5281/zenodo.5868022.

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School of Chemistry. Madurai Kamaraj University, Madurai-625 021, India Department of Chemistry, S. F. R. College for Women, Sivakasi-626 123, India <em>Manuscript received 25 November 1999. revised 27 January 2000. accepted 11 February 2000</em> The complexing ability of thiophene-2-aldehyde thiosemicarbazone (L) has been investigated. Copper complexes of the type CuLL<sub>1</sub> have been prepared, where L<sub>1</sub> = salicylaldehyde/salicylaldoximelsalicylaldehyde semicarbazone/salicylaldehyde phenylhydrazone/ salicylaldehyde thiosemicarbazone/8-hydroxyquinoline/2-hydroxypyridine. The co

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40

Ormachea, Carla M., Cristián A. Ferretti, Leandro Gutierrez, and María N. Kneeteman. "Study of a New Hydrazone System with Ion Complexation Capacity Suitable for Selective Detection." Chemistry Proceedings 3, no. 1 (2020): 134. http://dx.doi.org/10.3390/ecsoc-24-08392.

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The design and synthesis of chemosensors that allows the selectively detection of heavy metal cations by complexation, is an area of growing interest. The hydrazone functional group has been widely used in supramolecular chemistry due to its complexing capacity, its conjugated electrons, and its simple methods of synthesis. In this way, a nitrogen system derived from the condensation of vanillin (aromatic aldehyde) and 2-hydrazinobenzothiazole to give the corresponding hydrazone for the detection of Cu2+ was developed. Spectroscopic determinations demonstrate whether the complexing took place.

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Nair, M. Sivasankaran, and C. Ravi Samuel Raj. "Studies on the complexing behavior of a potentially tetradentate Schiff-base ligand with some transition metal ions." Journal of Coordination Chemistry 62, no. 17 (2009): 2903–8. http://dx.doi.org/10.1080/00958970902946694.

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Shamilov, E. N., A. S. Abdullaev, V. E. Shamilli, T. Y. Asgerova, Sh I. Gahramanova, and F. F. Jalaladdinov. "Protective properties of the nickel (II) complex with tryptophan." Faktori eksperimental'noi evolucii organizmiv 29 (August 31, 2021): 191–95. http://dx.doi.org/10.7124/feeo.v29.1430.

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Aim. The synthesized and characterized of the complex nickel (II) with tryptophan [NiL2 (H2O)2]; L = Trp. It is shown that the composition of the complex obtained depends on the ratio of the initial components. Methods. The composition and structure of the complex were studied by elemental, TG/DrTG-DTA analysis and IR spectroscopy. The method of IR showed that the ligand in the composition of the metal complex enter the neutral form and coordinate with the complexing agent through the nitrogen atom. Results. The results of thermogravimetric studies have shown that the final product of the ther

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43

Bondareva, L. P., Y. S. Peregudov, and A. V. Astapov. "Equilibrium of aliphatic amino acids on ion exchangers forming complexes in the presence of copper (II) and nickel (II) cations." Proceedings of the Voronezh State University of Engineering Technologies 81, no. 3 (2019): 217–24. http://dx.doi.org/10.20914/2310-1202-2019-3-217-224.

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The task of isolating and separating amino acids from aqueous solutions exists in various industries. The traditional method of isolation is ligand exchange chromatography. When choosing a cation for ligand-binding chromatography based on its binding strength with the ion exchanger, often used as a sulfonated polystyrene ion exchanger keeps the copper (II) firmly enough, and therefore, it is easily replaced by other cations. Chelating ion exchangers charge cations of copper (II), which hold these ions firmly enough. In this case, separating a mixture of substances, it is due to differences in

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Wilkinson, Kevin J., Peter G. C. Campbell, and Pierre Couture. "Effect of Fluoride Complexation on Aluminum Toxicity Towards Juvenile Atlantic Salmon (Salmo salar)." Canadian Journal of Fisheries and Aquatic Sciences 47, no. 7 (1990): 1446–52. http://dx.doi.org/10.1139/f90-163.

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In 7-d semistatic bioassays, fluoride complexation attenuated Al toxicity to juvenile Atlantic salmon (Salmo salar; age 1 +) and the accumulation of Al in gill tissue, but not to the extent predicted by the free-ion model of metal toxicity. Bioaccumulation and toxicity persisted even in the presence of an excess of the complexing ligand. An equilibrium model, involving the formation of a mixed ligand complex (F–Al–L-gill) at the gill surface, is proposed to explain this residual toxicity (L-gill = ligand at the gill surface). Exposure to Al, or to a combination of Al and F, led to a decrease i

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Shrivastava, Mukesh, G. Swarnabala, S. B. Khatavkar, G. S. Sadana та Anahita Bharadwaj. "Structural Investigations of Some Metal Complexes of Malon-Di-(α-Naphthyl) Amide-Oxime". Asian Journal of Chemical Sciences 14, № 6 (2024): 154–80. https://doi.org/10.9734/ajocs/2024/v14i6342.

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The study investigates the structural properties of Cu(II), Ni(II), Fe(II), Co(III), Zn(II), Cd(II), and Hg(II) complexes with malon-di-(α-naphthyl)amide-oxime (isonitroso malon-di-(α-naphthyl)amine oxime). It summarizes chemicals, equipment, experimental methods, metal-ligand bonding, stereochemistry, oxidation states, and coordination modes using spectral and magnetic data. Solution studies done with reagent and metal salts assisted in predicting geometry for these complexes, to finalize the M:L ratios and have allowed the pH to be established to separate the complex formed in solid state. T

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Rana, Md Sohel, Mohammad Arifur Rahman, and A. M. Shafiqul Alam. "A CV Study of Copper Complexation with Guanine Using Glassy Carbon Electrode in Aqueous Medium." ISRN Electrochemistry 2014 (April 2, 2014): 1–7. http://dx.doi.org/10.1155/2014/308382.

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Voltammetric behaviors of Copper (II) nitrogen bearing nucleobases, such as Guanine (C5H4N5O2) was studied in electro analyzer using cyclic voltammetry (CV) on a Glassy Carbon Electrode. Assessment of the chemical and physical conditions that may favor optimum current enhancement was done by studying the effect of variation of concentration of metal and ligand ions, variation of scan rate, variation of step height, variation of pH values, and variation of supporting electrolyte as (NH4)2SO4, KCl, and NaCl. It was observed that Copper and Guanine forms a 1 : 2 ratio complex. The work reflects t

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Say, Rıdvan, Bora Garipcan, Sibel Emir, Süleyman Patır, and Adil Denizli. "Preparation and Characterization of the Newly Synthesized Metal-Complexing-Ligand N-Methacryloylhistidine Having PHEMA Beads for Heavy Metal Removal from Aqueous Solutions." Macromolecular Materials and Engineering 287, no. 8 (2002): 539–45. http://dx.doi.org/10.1002/1439-2054(20020801)287:8<539::aid-mame539>3.0.co;2-o.

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Antunes, Patrícia Alexandra, Gilbert Bannach, Gilberto Orivaldo Chierice, and Éder Tadeu Gomes Cavalheiro. "Direct and simultaneous spectrophotometric determination of Ni (II) and Co (II) using diethanoldithiocarbamate as complexing agent." Eclética Química Journal 34, no. 2 (2018): 07. http://dx.doi.org/10.26850/1678-4618eqj.v34.2.2009.p07-13.

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A direct spectrophotometric method for simultaneous determination of Co(II) and Ni(II), with diethanoldithiocarbamate (DEDC) as complexing agent, is proposed using the maximum absorption at 360 and 638 nm (Co(II)/DEDC) and 390 nm (Ni/DEDC). Adjusting the best metal/ligand ratio, supporting eletrolite, pH, and time of analysis, linear analytical curves from 1.0 10-6-4.0 10-4 for Co(II) in the presence of Ni 1.0 10-6-1.0 10-4 mol L-1 were observed. No further treatment or calculation processes have been necessary. Recoveries in different mixing ratios were of 99%. Interference of Fe(III), Cu(II)

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Antunes, P. A., G. Bannach, G. O. Chierice, and E. T. G. Cavalheiro. "Direct and simultaneous spectrophotometric determination of Ni (II) and Co (II) using diethanoldithiocarbamate as complexing agent." Eclética Química 34, no. 2 (2009): 7–13. http://dx.doi.org/10.1590/s0100-46702009000200001.

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A direct spectrophotometric method for simultaneous determination of Co(II) and Ni(II), with diethanoldithiocarbamate (DEDC) as complexing agent, is proposed using the maximum absorption at 360 and 638 nm (Co(II)/DEDC) and 390 nm (Ni/DEDC). Adjusting the best metal/ligand ratio, supporting eletrolite, pH, and time of analysis, linear analytical curves from 1.0 10-6-4.0 10-4 for Co(II) in the presence of Ni 1.0 10-6-1.0 10-4 mol L-1 were observed. No further treatment or calculation processes have been necessary. Recoveries in different mixing ratios were of 99%. Interference of Fe(III), Cu(II)

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50

Ledoux, Isabelle, and Joseph Zyss. "From one- to two-dimensional complexes for quadratic nonlinear optics: the influence of ligand and complexing metal atoms." Pure and Applied Optics: Journal of the European Optical Society Part A 5, no. 5 (1996): 603–12. http://dx.doi.org/10.1088/0963-9659/5/5/014.

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