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Journal articles on the topic 'Metal-ligand stability constants'

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Published: 5 June 2025

Last updated: 1 August 2025

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1

N., DALLALI, and K. AGRAWAL Y. "Metal-Ligand Stability Constants of Heterocyclic Hydroxamic Acids." Journal of Indian Chemical Society Vol. 69, Apr 1992 (1992): 219–20. https://doi.org/10.5281/zenodo.6089206.

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Analytical Laboratory, Pharmacy Department, Faculty of Technology and Engineering, M. S. University of Baroda, Kalabhavan, Baroda-390 001 <em>Manuscript received 15 March 1991, revised 17 March 1992, accepted 19 March 1992</em> Metal-Ligand Stability Constants of Heterocyclic Hydroxamic Acids.

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2

T., A. Patekar, and Abdul Rahim Shaikh. "Coordination studies of Ritodrine Hydrochloride with selected transition Metal ions." International Journal of Current Science Research and Review 07, no. 12 (2025): 9424–26. https://doi.org/10.5281/zenodo.14584076.

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Abstract : The stability constants of binary complexes of metal ions   Cu²⁺, Ni²⁺, Co²⁺, Cr³⁺ and Zn<sup>2+</sup> with Ritodrine Hydrochloride ligand were studied in aqueous media at 28<sup>0</sup> C temperature. The Protonation constant and metal ligand stability constants were determined by Calvin Bjerrum titrations in combination with Microsoft excel software programme. 1 N NaNO<sub>3 </sub>used to maintain ionic strength. Metal ligand ratio kept was 1: 1. The Protonation constant and metal ligand stability constants calculated by half integral a

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3

PRITAM, VERMA, FULWADHVA USHA, and B. LAXMESHWAR N. "Potentiometric Studies in Solution of some Transitional Metal Ion and Rare Earth Metal Ion Complexes of 5-Benzal-3-methyl-2-thiohydantoin( 5-benzal-3-methyl-4-imidozolinone-2-thioxo)." Journal of Indian Chemical Society Vol. 62, Jul 1985 (1985): 502–3. https://doi.org/10.5281/zenodo.6321646.

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Physical Chemistry Laboratory, Institute of Science, Bombay-400 032 <em>Manuscript received 26 December 1984, revised 26 June 1985, accepted 31 July 1985</em> The stepwise stability constants of complexes of 5-benzal-3-methyl-2-thiohydantoin with transition metal ions and rare earth metal ions are determined by Calvin-Bjerrum potentiometric titration method. The work is conducted in 3 : 1 (v/v) dioxane-water medium of ionic strength 0.1 <em>N</em> and at temperature 27±1°. The order of stability constants is found to be in agreement with the order reported by earlier workers. I

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4

Nleonu, E.C., E.R. Enemo, and T.E. Ezenwa. "Conductometric Study on the Stability Constants and Thermodynamic Parameters of Fe3+ Complexes with some Ligands." Chemistry Research Journal 6, no. 3 (2021): 112–16. https://doi.org/10.5281/zenodo.11665158.

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<strong>Abstract </strong>The stability constants and theymodynamic parameters of Fe<sup>3+</sup> complexes with cyanide, thiocyanide, ethylene diamine tetraacetic acid, methylamine and ethylamine were studied by conductometric method in aqueous medium at different temperatures (302, 308, 313 & 318K). The stability constants and thermodynamic parameters of the metal-ligand complexes were studied at low concentration of the metal and ligand. The results indicated that, the complex formation is spontaneous, exothermic and entropically favourable. The complexes were observed to be stable at l

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5

Menon,, Sobhana K., and Yadvendra K. Agrawal,. "Proton-Ligand and Metal-Ligand Stability Constants of Hydroxamic Acids." Reviews in Inorganic Chemistry 16, no. 1 (1996): 1–90. http://dx.doi.org/10.1515/revic.1996.16.1.1.

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6

Agrawal, Y. K., R. Giridhar, and S. K. Menon. "Sulfa Drugs: Thermodynamic Proton—Ligand and Metal—Ligand Stability Constants." Journal of Pharmaceutical Sciences 76, no. 12 (1987): 903–6. http://dx.doi.org/10.1002/jps.2600761212.

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7

Leena, Gandhi, and S. Sekhon B. "Complexation equilibria of sulfisoxazole with proton and some metal ions in aqueous-organic solvents." Journal of Indian Chemical Society Vol. 83, Sep 2011 (2006): 868–70. https://doi.org/10.5281/zenodo.5829759.

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Department of Biochemistry and Chemistry, Punjab Agricultural University, Ludhiana-141 004, Punjab, India <em>E-mail :</em> sekhon224@yahoo.com <em>Manuscript received 4 January 2006, revised 4 May 2006, accepted 6 June 2006</em> The proton-ligand stability constant (log K\(_I^{II}\) i.e. p<em>K</em><sub>a</sub>) of sulfisoxazole in 50 : 50 (% v/v) aqueous ethanol and 50 : 50 (% v/v) aqueous-dioxane mixtures at different ionic strengths (0.05, 0.10 and 0.15 mol dm<sup>-3</sup>) and its stability constanlq with some metal ions were determined in 50 : 50 (% v/v) aqueous ethanol and aqueous-dioxa

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8

S.N., Jatolia, Verma S.K., Bhandari H.S., and Rathore Uma. "Potentiometric Study of Ni(II)-Thiosemicarbazone Systems in Micellar Medium." Chemistry Research Journal 5, no. 2 (2020): 195–201. https://doi.org/10.5281/zenodo.12493800.

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<strong>Abstract </strong>Ligand 2,6-Dihydroxyacetophenonethiosemicarbazone<sub> </sub>[2, 6 DHAT] has been synthesized.  The present work describes the synthesis, characterization, solution, and biological investigations on Ni (II)-thiosemicarbazone complexes. Solution studies on the complexes have also been carried out in different micellar [HTAB, SDS, TX-100] systems at 25°C and data have been compared with ethanol water mixture. Stability constants and molar ions in 60% ethanol were determined. Proton ligand stability constant and metal-ligand stability have been determined potent

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9

El-Bindary, Ashraf A., Adel Z. El-Sonbati, and Hanan M. Kera. "Thermodynamics of substituted pyrazolone. V: Potentiometric and conductometric studies of complexes of some transition metals with 4-(4-acetophenyl)hydrazono-3-methyl-2-pyrazolin-5-one." Canadian Journal of Chemistry 77, no. 7 (1999): 1305–9. http://dx.doi.org/10.1139/v99-122.

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Proton-ligand dissociation constants of 4-(4-acetophenyl)hydrazono-3-methyl-2-pyrazolin-5-one (AHMP) and metal-ligand stability constants of its complexes with some transition metal ions were calculated potentiometrically in 0.1 M KCl and 50% (v/v) ethanol-water mixture. The order of stability constants was found to be Th4+ > UO22+ > Ce3+ > La3+ > Mn2+ < Co2+ < Ni2+ < Cu2+ > Zn2+. The dissociation constant, pK1H, of AHMP and the stability constants, log K, of their complexes were determined at different temperatures (298, 308, and 318 K). The corresponding thermodynamic

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10

V., V. RAMANA, YAMUNA K., and SARASWATHI K. "Stability Constants of Metal Complexes of 1,2,4-Triazoles." Journal of Indian Chemical Society Vol. 68, Dec 1991 (1991): 666–67. https://doi.org/10.5281/zenodo.6135029.

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Department of Chemistry. S. V. University, Tirupati-517 502 <em>Manuscript received 21 May 1990, revised 2 December 1991, accepted 6 December 1991</em> The present study reports the stability constants of the metal complexes using bivalent Mn, Fe, Co, Ni, Cu and Zn with 4-amino-3-(methylphenyl)-5- mercapto-1 ,2,4-triazole (1), 4-amino-3-phenyl-5-mercapto-1,2,4-triazole (2), 4-amino-3-(p-cblorophenoxymethyl)-5-mercapto-1,2,4-triazole (3), 4-amino-3· (phenoxymethyl)-5-mercapto-1,2,4-triazole (4).

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11

V., T. Chaudhari, and Farooqui Mazahar. "Chemical equilibrium studies on some bivalent transition metal chelates of biologically active molecules (drugs)." Journal of Indian Chemical Society Vol. 86, Feb 2009 (2009): 166–67. https://doi.org/10.5281/zenodo.5807510.

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S.S.M.M. Arts, Science & Commerce College, Pachora, Dist. Jalgaon, Maharashtra, India Aurangabad College for Women, Navkhanda, Aurangabad, Maharashtra, India <em>E-mail </em>: Mazahar_64@rediffmail.com. <em>Manuscript received 27 May 2008, revised 22 September 2008, accepted 25 September 2008</em> Stability constants of metal chelates of dicyclomine hydrochloride (dcm), metformin hydrochloride (mfm) drugs with the Co<sup>II</sup>, Ni<sup>II</sup> and Cu<sup>II</sup> transition metal ions have been evaluated pH metrically in aqueous solution at 25 °C and 0.1 <em>M </em>(NaCIO<

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12

B., S. Sekhon, and Kaur Charanjit. "Proton-ligand stability constants of cefadroxil and stability constants of its metal complexes in aqueous-organic mixtures." Journal of Indian Chemical Society Vol. 83, Oct 2006 (2006): 1037–38. https://doi.org/10.5281/zenodo.5831356.

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Department of Biochemistry and Chemistry, Punjab Agricultural University, Ludhtana-141 004, PunJab, lndta <em>E-mail </em>: sekhon224@yahoo.com <em>Manuscript received 4 January 2006, revised 27 July 2006, accepted 31 July 2006</em> Proton-ligand stability constants of cefadroxil and its metal-ligand stability constants with cu<sup>2</sup>+, Cd<sup>2</sup> and Co<sup>2</sup>+ ions were determined pH-metrically at 30 ºC and ionic strength of 0.15 M KCI in aqueous, water-alcohol (75 : 25% v/v) and water-dioxane (75 : 25% v/v) mixtures. Cefadroxil formed 1 : 1 (ML) complexs with Cd<sup>2</su

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13

Agrawal, Y. K., and D. R. Patel. "Thermodynamic Proton-Ligand and Metal-Ligand Stability Constants of Some Drugs." Journal of Pharmaceutical Sciences 75, no. 2 (1986): 190–92. http://dx.doi.org/10.1002/jps.2600750219.

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14

Atabey, Hasan, Faisal Naji Al-Obaidi, and Hayati Sari. "Potentiometric Study of the Dissociation and the Metal Complex-formation Competence of 5-(3,3-dimethyl-1- triazeno)-imidazole-4-carboxamide (Dacarbazine)." Acta Chimica Slovenica 70, no. 1 (2023): 21–28. http://dx.doi.org/10.17344/acsi.2022.7756.

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A potentiometric investigation has been carried out to disclose the coordination properties of Dacarbazine, 5-(3,3-dimethyl-1-triazeno)-imidazole-4-carboxamide (abbreviated DTIC) with particular transition metal ions (Zn2+, Cu2+, Ni2+ and Co2+). The coordination of DTIC with these metal ions results in several complexes emerging in solution. The aim of this work is to determine the protonation constants of the DTIC and to show the extent of its coordination with (Zn2+, Cu2+, Ni2+ and Co2+), in other words, establish the stability of the complexes formed between the DTIC and these metal ions by

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15

Purushottam, B. Chakrawarti, Chakrawarti Mukta, and Maini Pramila. "Chemical equilibrium studies on some bivalent metal chelates of cephalexin." Journal of Indian Chemical Society Vol. 77, Feb 2000 (2000): 85–87. https://doi.org/10.5281/zenodo.5862587.

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Chemical Laboratories, M. V. M., Bhopal-462 002, India <em>Manuscript received 17 May 1999, revised 23 August 1999, accepted 27 August 1999</em> The stability constants of metal chelates of cephalexin (an antibiotic drug) with Co<sup>II</sup>, Ni<sup>II</sup>, Cu<sup>II</sup>, Zn<sup>II</sup> ions have been evaluated pH-metrically in aqueous solutions at 25 and 30° and 0.1 <em>M </em>(NaCIO<sub>4</sub>) ionic strength. The ternary formation constants of metal chelates MLA, where M -= bivalent ions, L = cephalexin and A =α-alanine, have also been determined potentiometrically; cephale

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16

R.D.Deshmukh, K.P.Kakade S.D. Thakur Bar.R.D.I.K &. Ny K.D.college Badnera Rly. "DETERMINATION OF STABILITY CONSTANTS OF METAL–LIGAND COMPLEXES SPECTROPHOTOMETRICALLY." GLOBAL JOURNAL OF ENGINEERING SCIENCE AND RESEARCHES 6, no. 1 (2019): 170–73. https://doi.org/10.5281/zenodo.2551725.

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<strong>:</strong>  Present work highlight the investigation of conditional stability constant and formation constant of metal-ligand complexes of ligands i.e 2-Hydroxy naphthalene phenyl-N-(3-chloro 4-fluoro) chalconeimine  [CFB] and ligands 2-Hydroxy naphthalene 4-dimethyl  aniline -N-(3-chloro 4- fluro)  chalconeimine [CFN] with Co II metal ion with dioxane-water systems at different proportions by Isobestic Method of continuous variation. The measurement of absorbance was done by spectrophotometer. The stiochiometry of complex formation found to be 1:1and 1:2.This inves

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17

A., Chandra Leela, and Nageswara Rao G. "Stability of binary complexes of L-aspartic acid in dioxan-water mixtures." Journal Of Indian Chemical Society Vol. 91, Jan 2014 (2014): 9–12. https://doi.org/10.5281/zenodo.5559697.

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Department of Inorganic & Analytical Chemistry, Andhra University, Visakhapatnam-530 003, Andhra Pradesh, India <strong><em>E-mail </em>: gollapallinr@yahoo.com </strong> <em><strong>Manuscript received online 07 December 2012, revised 24 January 2013, accepted 01 February 2013</strong></em> An electrometric investigation was made on the formation equilibria of binary complexes of aspartic acid with Ca<sup>II</sup>, Mg<sup>II</sup> and Zn<sup>II</sup> at 303 K and an ionic strength of 0.16 mol L<sup>–1</sup>. The stability constants of the species ML, ML<sub>2</sub>H<sub>2</sub>, ML<

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18

Gérard, Christian, Hanane Chehhal, and Michel Aplincourt. "Stability of Metal Complexes with a Ligand of Biological Interest: Noradrenaline." Journal of Chemical Research 23, no. 2 (1999): 90–91. http://dx.doi.org/10.1177/174751989902300212.

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Stoichiometry, equilibrium constants and spectra of iron(III) complexes with noradrenaline have been determined from spectrophotometric measurements; in addition equilibrium constants of complexes with MgII, CdII and PbII have been determined from potentiometric measurements.

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19

Deosarkar, S. D., A. L. Puyad, and S. A. Chavan. "Stability Constants of Some Biologically Important Pyrazoles and Their Ni2+Complexes in Different Dielectric Constant of Medium." E-Journal of Chemistry 9, no. 2 (2012): 637–41. http://dx.doi.org/10.1155/2012/950625.

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The proton-ligand stability constants of some biologically important new pyrazoles and formation constants of their complexes with Ni(II) were determined at 0.1 mol dm-3ionic strength and at 303.15 K in different dielectric constant of dioxane-water mixture by potentiometric method. The Calvin-Bjerrum's pH-titration technique as used by Irving and Rossotti was used for determination of stability constants. The results enabled to study the electrostatic forces of attraction between metal ion and ligand with changes in dielectric constant of the medium.

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20

N., IBENOUBI, MANIHAR AK., and RAJMUHON N. "Stability Constants of Zinc-, Cadmium- and Manganese(II) Complexes of 1-Amidino-O-isobutyIurea." Journal of Indian Chemical Society Vol. 74, Oct 1997 (1997): 793–94. https://doi.org/10.5281/zenodo.5897090.

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Chemistry Department, Manipur University, Canchipur-795 003 <em>Manuscript received 20 December 1995. revised 30 October 1996, accepted 18 November 1996</em> Stability Constants of Zinc-, Cadmium- and Manganese(II) Complexes of 1-Amidino-<em>O</em>-isobutyIurea.

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21

MENON, S. K., and Y. K. AGRAWAL. "ChemInform Abstract: Proton-Ligand and Metal-Ligand Stability Constants of Hydroxamic Acids." ChemInform 28, no. 6 (2010): no. http://dx.doi.org/10.1002/chin.199706321.

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22

Du, Ruobing, Donghai Yu, Huaying An та ін. "α,β-Substituent effect of dialkylphosphinic acids on lanthanide extraction". RSC Advances 6, № 61 (2016): 56004–8. http://dx.doi.org/10.1039/c6ra10214j.

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The calculational first stability equilibrium constants and experimental extraction equilibrium constants are similar in trend. And the simplified model was used to explore the metal–ligand interactions and effect of alkyl-substituent on extraction.

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23

Siddappa, Kuruba, and Nabiya Sultana Mayana. "Synthesis, Spectroscopic Characterization, and Biological Evaluation Studies of 5-Bromo-3-(((hydroxy-2-methylquinolin-7-yl)methylene)hydrazono)indolin-2-one and Its Metal (II) Complexes." Bioinorganic Chemistry and Applications 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/483282.

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The Schiff base ligand 5-bromo-3-(((8-hydroxy-2-methylquinolin-7-yl)methylene)hydrazono)indolin-2-one (BHMQMHI) was preparedviacondensation of 5-bromo-3-hydrazonoindolin-2-one and 7-formyl-8-hydroxy-2-methylquinoline and its Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) complexes have been synthesized and characterized by elemental analysis, conductance data, magnetic susceptibility measurements, IR, UV-Vis, mass spectrometry,1H NMR, ESR, XRD, and thermal studies. By these spectral studies it is found that Co(II), Ni(II), and Cu(II) complexes have exhibited octahedral geometry whereas the

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24

Balakrishna, M., P. H. K. Charan, K. P. Suhasini, and M. Ramanaiah. "Nature and Stability of Co(II), Ni(II) and Cu(II) Complexes with 5-Hydroxysalicylic Acid in DMSO-Water Mixtures: An Electrometric Investigation." Research Journal of Chemistry and Environment 28, no. 6 (2024): 63–71. http://dx.doi.org/10.25303/286rjce63071.

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The main objective of the present study is to conduct an experiment to analyze the variation of protonation-deprotonation equilibria with regards to the dielectric constants of an organic medium, influence of errors on protonation constants and effect of pH chemical species distribution. The present investigation was carried out by using pH meter, processing of data was done by Gran titration. To obtain best fit chemical models, a modelling strategy such as SCPHD was used and a computer program was used for the refinement of results. In the present study, we studied the influence of dielectric

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25

Naggar, Ahmed Hosny, Hammed Mohammed Al-Saidi, Othman Abd El-Moaty Farghaly, Taher Mohammed Hassan, and Salma Zaidan Mohamed Bortata. "Complexation equilibria of ambroxol hydrochloride in solution by potentiometric and conductometric methods." European Journal of Chemistry 9, no. 1 (2018): 49–56. http://dx.doi.org/10.5155/eurjchem.9.1.49-56.1682.

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The formation constants of Li(I), Mg(II), Sr(II), Ca(II), Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Ba(II), Pb(II), Al(III), Cr(III), Fe(III) and Th(IV) ions with ambroxol hydrochloride (AMB) were calculated using the half-n value. In presence of 0.1 M NaNO3, metal ions such as Zn(II), Cd(II), Ni(II), Cr(III), Li(I), Mg(II) and Al(III) forms three types of metal-ligand complexes (1:1, 1:2 and/or 1:3), while Sr(II) and Co(II) tend to form two types of metal complexes 1:1 and 1:2 (M:L). For ligand protonation constants, two logarithmic association constant values were calculated by the hal

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26

Fatima, Rida, Sohail Nadeem, Mohsin Javed, et al. "Antimicrobial Activities Along With Spectrophotometric Assessment of Stability Constants of Copper (II) and Cobalt (II) With 1,2-Bis(2,5-dimethoxybenzylidene) Hydrazine." International Journal of Analytical Chemistry 2022 (June 2, 2022): 1–9. http://dx.doi.org/10.1155/2022/7689617.

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The stability constants of 1,2-bis(2,5-dimethoxybenzylidene) hydrazine (DMBH) were determined using the modified Job’s method with the addition of the UV-Vis approach using salts of copper (II) (chloride and acetate) and salts of cobalt (II) (chloride and nitrate). Copper (II) chloride with a ligand at 1L:2M (stoichiometric ratio) was discovered to have a higher stability constant log value (6.995) than other metal salts. The stability constant log value (5.811) for cobalt (II) nitrate at 1L:2M (stoichiometric ratio) was found to be less stable than the other stability constants evaluated. Ant

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27

K.P.Kakade1, Dr.R.D.Deshmukh2 Dr. S.D. Thakur3& Sarita P. Kakade 4. "PH METRIC STUDIES on FORMATION CONSTANTS OF THE COMPLEXES OF HALO SUBSTITUTED CHALCONEIMINE WITH SOME TRANSITION METAL ION 70% DIOXANE-WATER MIXTURE pH METRICALLY." GLOBAL JOURNAL OF ENGINEERING SCIENCE AND RESEARCHES [NC-Rase 18] (November 23, 2018): 54–59. https://doi.org/10.5281/zenodo.1495006.

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The interaction of Cu(II), Ni(II) ,Co(II), Cr(II), Fe(III) metal ions with 2- hydroxyl phenyl n (m- chloro-p Fluro) chalconeimine <strong>(CFB)</strong> have been studied at 0.1 M ionic strength (26± 0.10 C) in 70% Dioxane- water mixture by Bjerrum method as adopted by Calvin Wilson. The data obtained were used to estimate and compare the value of proton- ligand stability constant (pK) and metal- ligand stability constant ( log k). The effect of substituent was studied from estimated data (pk & log k).

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28

FAZLUR, RAHMAN, N. RASTOGI S., and K. JETLEY U. "Stability Constants of some Bivalent Metal Complexes with 2-Hydroxy-3,5-dimethylacetophenone Oxime." Journal of Indian Chemical Society Vol. 67, April 1990 (1990): 342. https://doi.org/10.5281/zenodo.6163860.

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Chemical Laboratories, D. N. College, Meerut-250 002 <em>Manuscript received 23 March 1989, revised 15 September 1989, accepted 10 November 1989</em> Stability Constants of some Bivalent Metal Complexes with 2-Hydroxy-3,5-dimethylacetophenone Oxime.

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29

B., S. Sekhon, Srivastava Juhi, Kaur Sarbjit, and K. Randhawa S. "Complexation equilibria of ciprofloxacin with proton and metal ions in aqueous-organic mixutres." Journal of Indian Chemical Society Vol. 85, Feb 2008 (2008): 200–202. https://doi.org/10.5281/zenodo.5808872.

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Department of Biochemistry and Chemistry, Department of Agronomy and Agrometrology, Punjab Agricultural University, Ludhiana-141 004, Punjab, India <em>E-mail :</em> sekhon224@yahoo.com <em>Manuscript received 8 June 2007, revised 5 November 2007, accepted 5 November 2007</em> The proton-ligand stability constants (log <em>K</em><sub>1</sub><sup>H</sup>, log <em>K</em><sub>2</sub><sup>H</sup>) of ciprofloxacin (CIP) and its metal-ligand stability constants (log <em>K</em><sub>1</sub>) in aqueous, acetonitrile-water, alcohol-water, DMSO-water and 1,4-dioxan-water (25 : 75 and 50 : 50% v/v) mixt

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30

Murhekar, G. H., A. R. Raut, and R. S. Sonone. "Stability Constants of Lanthanide Metal Ions Chelates with Substituted Pyrazoles in Different Solvents." Material Science Research India 8, no. 1 (2011): 131–36. http://dx.doi.org/10.13005/msri/080119.

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The reaction of Pr (III) and Nd (III) metal ions with some substituted pyrazoles, at 0.1M ionic strength and at 30 ± 0.10C in 70% acetone-water mixture and 70% propanol-water mixture have been studied pH-metrically. The data obtained were used to estimate the values of proton-ligand (pK) and metal-ligand (logK) stability constants in different solvents. It is observed that the pK and logK values in 70% propanol-water mixture are grater than in 70% acetone -water mixture. Pr (III) and Nd (III) metal ions formed 1:1 and 1:2 complexes with all the ligands in both solvent medium.

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31

Gharib, Farrokh, Karim Zare, and Kavosh Majlesi. "Ionic Strength Dependence of Formation Constants, Protonation and Complexation of Phenylalanine with Dioxovanadium(V) at different temperatures." Journal of Chemical Research 2000, no. 4 (2000): 186–87. http://dx.doi.org/10.3184/030823400103166896.

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The protonation constants of phenylalanine and the stability constants of the complexes between dioxovanadium(V) ion and phenylalanine have been determined spectrophotometrically, in the temperature range 15–35°C and ionic strength ranging from 0.1 to 1.5 mol dm−3 sodium perchlorate as a background salt, in the pH range 1.5–10.5, with high ligand to metal ratios. The values of enthalpy and entropy changes based on these formation constants were calculated. The dependence of protonation and the stability constants on ionic strength are described by a Debye-Huckel type equation.

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32

Shankar, Vijay. "Formation and Stability of Mixed Ligand Complexes with Some Metal Ions of Transition Metals." Anusandhaan - Vigyaan Shodh Patrika 8, no. 1 (2020): 18–21. https://doi.org/10.22445/avsp.v8i1.3.

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Mixed ligand complexes of the ligand Nitrilotriacetic acid/ NTA (A) and Adenine (B) with Co(II), Ni(II), Cu(II) and Zn(II) metal ions have been carried out potentiometrically at temperature 30 and at constant ionic strength I = 0.1 M NaNO3.The overall stability constants (log β) have been evaluated and refined by SCOGS computer Programme. The mixed ligand complex species of the type MAB have been analyzed.

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33

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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34

Sunanda, Das, and C. Chattopadhyaya M. "Substitution effect on metal complexes of 2-hydroxybenzoic acid." Journal of India Chemical Society Vol 81, Sep 2004 (2004): 773–74. https://doi.org/10.5281/zenodo.5833077.

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Department of Chemistry, C. M. P. Degree College, Allahabad-211 002, India Electrochemical Sensor Laboratory, Department of Chemistry, University of Allahabad, Allahabad-211 002, India <em>E-mail</em>: tulip_l25@indiatimes.com; mcc46@rediffmail.corn <em>Manuscript received 4 August 2003, revised 9 February 2004. accepted 11May 2004</em> Stability constants of 2-hdroxybenzoic acid, 2-hydroxy, 5-sulphobenzoic acid and 2-hydroxy, 3-methyl, 5-sulphobenzoic acid with metal ions Mn<sup>II</sup>, Co<sup>II</sup>, Ni<sup>II</sup> and Zn<sup>II</sup> have been determined by pH titration technique at an

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35

Guseva, Polina B., Alexander R. Badikov, Oleg S. Butorlin, et al. "Complexation of Lanthanides(III) Ions with Terephthalic Acid in Aqueous Solutions by Potentiometric Titration Combined with Photoluminescence Spectroscopy." Chemistry 7, no. 2 (2025): 57. https://doi.org/10.3390/chemistry7020057.

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The complexation behavior of lanthanide(III) ions with terephthalic acid (1,4-benzene-dicarboxylic acid) in 0.01 M KNO3 aqueous solutions was studied across a broad pH range and at two metal-to-ligand ratios using potentiometric titration combined with photoluminescence spectroscopy. Chemometric analysis of titration curves enabled the determination of relative molar fractions, stability constants, and probable stoichiometry of the formed complexes. In solutions with a 1:2 metal-to-ligand ratio, bis-complexes (two terephthalate ligands per lanthanide ion) predominated, while ligand-rich condit

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AH, Naggara, Mauof HA, Ekshiba AA, and Farghalya OA. "Potentiometric and conductometric studies of binary and ternary complexes of sulphamethoxazole and glycine with metal ions." Pharmaceutical and Chemical Journal 3, no. 1 (2016): 125–37. https://doi.org/10.5281/zenodo.13740237.

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Potentiometric and conductometric studies of binary and ternary complexes of sulphamethoxazole (SMZ) and glycine (Gly) with metal ions; Fe(III), Pb(II), Co(II), Al(III), La(III), Sr(II), Cr(III), Th(IV), Ti(II) and Zr(IV). In 0.1 M NaClO<sub>4</sub> and 25 % (v/v) ethanol–water mixture, stability constant of metal ions complexes with SMZ have been determined potentiometrically. The ionic strength effect on the formed complexes stability was studied. The stoichiometries of these complexes were determined conductometrically and indicated that the formation of 1: 1, 1: 2 and/or 1: 3 (metal:

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37

Kostic, Ivana, Tatjana Andjelkovic, Ruzica Nikolic, Tatjana Cvetkovic, Dusica Pavlovic, and Aleksandar Bojic. "Comparative study of binding strengths of heavy metals with humic acid." Chemical Industry 67, no. 5 (2013): 773–79. http://dx.doi.org/10.2298/hemind121107002k.

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The complexation of humic acid with certain heavy metal ions (Co(II), Ni(II), Cu(II), Zn(II) and Pb(II)) was investigated. The stability constants of humate complexes were determined by method which is based on distribution of metal ions between solution and resin in the presence and the absence of ligand, known as Schubert?s ion exchange method. Experiments were performed at 25 ?C, at pH 4.0 and ionic strength of 0.01 mol dm-3. It was found that the 1:1 complexes were formed between metal ions and humic acid. Obtained results of the stability constants, log ?mn, of complexes formed between th

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38

Salinas, F., J. L. Martinez-Vidal, and A. R. Feranadez-Alba. "Metal-Ligand Stability Constants of Divalent Ions With Mandelohydroxamic Acid (Mha)." Bulletin des Sociétés Chimiques Belges 98, no. 6 (2010): 371–74. http://dx.doi.org/10.1002/bscb.19890980604.

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39

Ramandeep, Kaur, and S. Sekhon B. "Stability constants of 5-carboxyuracil and 5-carboxy-2-thiouracil with some metal ions." Journal of Indian Chemical Society Vol. 83, Jul 2006 (2006): 645–48. https://doi.org/10.5281/zenodo.5820215.

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Department of Biochemistry and Chemistry, Punjab Agricultural University, Ludhiana-141 004, Punjab, India E-mail: sekhon224@yahoo.com; ramandeep82@rediffmail.com <em>Manuscript received 26 August 2005, revised 28 February 2006, accepted 4 April 2006</em> The slability constants of metal complexes formed between Cu<sup>2+</sup>, Zn<sup>2+</sup>,Hg<sup>2+<sub>,</sub></sup> UO<sup>\(_2^{2+}\)</sup>, VO<sup>2+</sup>, Ni<sup>2+</sup>, Co<sup>2+</sup> and Fe<sup>3+</sup> metal ions with 5-carboxyurucil and 5·carboxy-2-thiourucil were dstermined by potentiometric titration technique.

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40

Nadkarni, N. G., and K. V. Mangaonkar. "Stability Constants of Mixed Ligand Complexes of Transition Metal(II) Ions with Salicylidene-4-methoxyaniline as Primary Ligand and 5-Bromosalicylidene-4-nitroaniline as Secondary Ligand." E-Journal of Chemistry 8, no. 4 (2011): 1765–69. http://dx.doi.org/10.1155/2011/342498.

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Binary and ternary complexes of the type M-Y and M-X-Y [M = Mn(II), Ni(II), Cu(II) and Zn(II); X = salicylidene-4-methoxyaniline and Y=5-bromosalicylidene-4-nitroaniline] have been examined pH-metrically at 27±0.5 °C and at constant ionic strength, μ= 0.1 M (KCl) in 75 : 25(v/v) 1,4-dioxne-water medium. The stability constants for binary (M-Y) and ternary (M-X-Y) systems were calculated. The relative stability (Δ log KT) values of the ternary complexes with corresponding binary complexes for all the metal(II) ions in the present study found to be negative indicating that ternary 1:1:1 (M-X-Y)

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K., JAGANNADHA CHARYULU, L. OMPRAKASH K., V. CHANDRA PAL A., and L. N. REDDY M. "Stability Constants of Copper(II), Nickel(II), Cobalt(II) and Zinc(II) Complexes with Some Hydroxycoumarins." Journal of Indian Chemical Society Vol. 62, Feb 1985 (1985): 121–23. https://doi.org/10.5281/zenodo.6303397.

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Department of Chemistry, Osmania University, Hyderabad-500 007 <em>Manuscript received 22 August 1983, revised 25 April 1984, accepted 18 January 1985</em> The new bidentate Schiff bases of 8-formyl-7-hydroxy-4-methyl-<em>2H</em>-1-benzopyran-2-one (FHMB) with aniline (FHMBANIL) or <em>p</em>-methylaniline (FHMBMANIL) have been synthesised and characterised by analytical and spectral data. Proton-ligand formation constants of these compounds and metal-ligand formation constants of their metal chelates with Cu<sup>ll</sup>, Ni<sup>II</sup>, Co<sup>II</sup> and Zn<sup>II</sup> have bee

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42

S., B. SAXBNA, and K. AGARWAL Y. "Determination of Stability Constants of 4-(o-Methoxyphenyl) thiosemicarbazide Complexes with Cobalt(II), Nickel(II) and Oxovanadium(IV)." Journal of Indian Chemical Society Vol. 62, Apr 1985 (1985): 279–80. https://doi.org/10.5281/zenodo.6324559.

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Department of Applied Chemistry, Madhav Institute of Technology and Science, Gwalior-474 005 <em>Manuscript received 30 May 1983, revised 3 January 1985, accepted 29 April 1985</em> Potentiometric studies on metal complexes of Co<sup>2+</sup>, Ni<sup>2+</sup> and VO<sup>2+</sup> with 4-(<em>o</em>-methoxyphenyl)thiosemicarbazide have been investigated. The proton-ligand dissociation constants ( pK <sub>1</sub> and pK<sub>2</sub> ) of the reagent and the formation constants of IN metal complexes have been determined by Bjerrum's method at 37± 1° and at th

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43

Ghosh, Suparna, and Suman Malik. "Complexation and Antimicrobial Studies of Some Divalent Metal Chelates." E-Journal of Chemistry 7, no. 4 (2010): 1391–95. http://dx.doi.org/10.1155/2010/252075.

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Metal chelates of Ni(II) and Cu(II) with the ligand 5-acetamido-1,3,4-thiadiazole-2-sulphonamide have been synthesized. The isolated compounds have been characterized by elemental analysis, molar conductivity, magnetic moment, electronic and IR spectral studies. The analytical data reflects the metal to ligand stoichiometry to be 1: 2. The conductivity data of the complexes also suggests their non-electrolytic nature. The stability constants and free energy change for the complexes have been calculated.. Ligand and their complexes have been screened for their biological activity and the data s

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44

Suman, Verma, and Seth Gita. "Potentiometric studies on the complexes of Cu(II) and Ni(II) with some amino acids and 2-(2' -hydroxyphenyl) benzoxazole." Journal of Indian Chemical Society Vol. 88, Sep 2011 (2011): 1435–38. https://doi.org/10.5281/zenodo.5790393.

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Department of Chemistry, University of Rajasthan, Jaipur-302 004, Rajasthan, India <em>E-mail</em> : gita_seth@yahoo.co.in <em>Manuscript received 30 December 2009, revised 27 January 2011. accepted 02 February 2011</em> The stability constants of binary and ternary metal complexes of copper(ll) and nickel (ll) with some amino acids (L-Ieucine, L-valine, I.-serine and I.-isoleucine) as primary ligands and 2-(2'-hydroxyphenyl)benzoxazole (HBO) as secondary ligand have been determined potentiometrically at an ionic strength 1.0 mol dm-3 KN03 at 35 ± 1°C. The stability of the binar

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45

Vegi, Rao, Latha Muddapu, Rao Tirukkuvalluri, and Rao Gollapalli. "Computer augmented modelling studies of Pb(II), Cd(II), Hg(II), Co(II), Ni(II), Cu(II) and Zn(II) complexes of L-glutamic acid in 1,2-propanediol-water mixtures." Journal of the Serbian Chemical Society 73, no. 12 (2008): 1169–80. http://dx.doi.org/10.2298/jsc0812169v.

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Chemical speciation of Pb(II), Cd(II), Hg(II), Co(II), Ni(II), Cu(II) and Zn(II) complexes of L-glutamic acid was studied at 303 K in 0-60 vol. % 1,2-propanediol-water mixtures, whereby the ionic strength was maintained at 0.16 mol dm-3. The active forms of the ligand are + LH3, LH2 and LH-. The predominant detected species were ML, ML2, MLH, ML2H and ML2H2. The trend of the variation in the stability constants with changing dielectric constant of the medium is explained based on the cation stabilizing nature of the co-solvents, specific solvent-water interactions, charge dispersion and specif

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Parekh, Prakash C., Sobhana K. Manon, and Yadvendra K. Agrawal. "The thermodynamic metal–ligand stability constants of hydroxamic acids with some divalent metal ions." J. Chem. Soc., Perkin Trans. 2, no. 8 (1989): 1117–23. http://dx.doi.org/10.1039/p29890001117.

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G., SRINJVAS REDDY, SIREESHA B., SARALA DEVI CH., MOHIUDDIN RAFEEQ, GYANA KUMARI C., and RAM REDDY M.G. "Interaction of Nickel-, Cobalt-, Zinc- and Lead(II) with Benzothiazole-2-carboxyhydrazides in Solution : Synthesis of their Copper(II) Complexes." Journal of Indian Chemical Society Vol. 75, May 1998 (1998): 290–92. https://doi.org/10.5281/zenodo.5925720.

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Depmtment of Chemistry, University College for Women, Osmania University, Koti, Hyderabad-500 195 <em>Manuscript received 13 March 1997, revised 20 August 1997, accepted 3 October 1997</em> The Cu<sup>II</sup> complexes of benzothiazole-2-carhoxyhydrazide (BTCH), benzothiazole-2-(1'-N-mcthyl)carboxyhydrazide (BTCMH) and benzothiazole- 2-(1'-N-phenyl)carboxyhydrazide (BTCPH) have been synthesized. Proton-lignad constants of BTCH, BTCPH and BTCMH and metal-ligand formation constants of their binary complexes with Ni<sup>II</sup>, Co<sup>II</sup>, Zn<sup>II</sup> and Pb<sup>II</sup> have

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48

Bashir, Shabnum, Syed Raashid Maqsood, Ghulam Mustafa Peerzada, Badruddin Khan, and Masood Ahmad Rizvi. "Complexation of Oxovanadium(IV) and Dioxouranium(VI) with Synthesized 1,2-(Diimino-4′-antipyrinyl)-1,2-diphenylethane Schiff Base: A Thermodynamic, Kinetic, and Bioactivity Investigation." Journal of Inorganic Chemistry 2014 (December 28, 2014): 1–11. http://dx.doi.org/10.1155/2014/268383.

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We report the comparative synthetic methodologies and characterization of a tetradentate Schiff base ligand 1,2-(diimino-4′-antipyrinyl)-1,2-diphenylethane (DE). The target synthesis of oxovanadium(IV) and dioxouranium(VI) complexes (vanadyl and uranyl) with the (DE) ligand was also attempted to envisage the effect of metal ion steric factor on complexation process through solution phase thermodynamic and kinetic studies. The thermodynamic stabilities of synthesized vanadyl and uranyl (DE) complexes are discussed in light of their solution phase thermodynamic stability constants obtained by el

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B., S. Garg, and Dwivedi Poonam. "Investigations and chemical speciation of ternary complexes of bivalent metal ions with cephalexine as primary ligand and glycine and valine as secondary ligands." Journal of Indian Chemical Society Vol. 83, March 2006 (2006): 229–32. https://doi.org/10.5281/zenodo.5817391.

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Department of Chemistry, University of Delhi, Delhi-110 007, India <em>E-mail</em> : dubeyr@mamraonline.com Fax: 91-11-27666250 <em>Manuscript received 22 March 2004, accepted 7 December 2005</em> Studies on ternary complexes or bivalent metal ions viz. Cu<sup>ll</sup>, Pb<sup>ll</sup>, Ni<sup>ll</sup>, zn<sup>ll</sup>, co<sup>ll</sup>, Cd<sup>ll</sup>, Mo<sup>ll</sup>, Mg<sup>ll</sup> and Ca<sup>ll</sup>, hereafter, M(II), with cephalexine (HCEX) as primary ligand and glycine (Gly) and valine (Val) as secondary ligands in 1 : 1 : 1 ratio, have been investigated by potentiometric technique at

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Solov’ev, Vitaly, and Alexandre Varnek. "Thermodynamic radii of lanthanide ions derived from metal–ligand complexes stability constants." Journal of Inclusion Phenomena and Macrocyclic Chemistry 98, no. 1-2 (2020): 69–78. http://dx.doi.org/10.1007/s10847-020-01010-0.

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