Dimer species in dimethyl sulfoxide–water (80∶20 w/w) solution of N,N′-bis(salicylideneimine)-m-phenylenediamine (H2sal-m-phen) and similar Schiff bases with CuII, NiII, CoII and ZnII. Crystal structure of [Co2(sal-m-phen)2]·CHCl3 ‡

Hernández-Molina, Rita; Mederos, Alfredo; Gili, Pedro; Domı́nguez, Sixto; Lloret, Francesc; Cano, Joan; Julve, Miguel; Ruíz-Pérez, Catalina; Soláns, Xavier

doi:10.1039/a702151h

Cited by 42 publications

(16 citation statements)

References 28 publications

(60 reference statements)

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“…The increase in the value of ionization constants as compared with our earlier investigation is due to the inductive electron-donor effect of the next methyl substituent on the aromatic ring [37,41]. The stability constants (log β) and equilibrium constants (logK) of the complexes formed in the Ln 3+ /H 2 L systems are listed in Table 1.…”

Section: Potentiometric Measurementsmentioning

confidence: 99%

“…1) was obtained in a condensation reaction, and single crystals suitable for X-ray analysis were obtained by slow evaporation of the solvent [36]. Due to the insolubility of that type of ligand in water, the potentiometry studies were performed in mixtures of organic solvents, e.g., dimethyl sulfoxide [37], methanol [38], ethanol [39] or dioxane [40] with water. Our research led to the selection of a mixture of the dimethyl sulfoxide water 30:70 (v/v) [41].…”

Section: Synthesis Of Nn'-bis(5-methylsalicylidene)-4-methyl-mentioning

confidence: 99%

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Potentiometric determination of novel complexes of selected lanthanide ions with N,N’-bis(5-methylsalicylidene)-4-methyl-1,3-phenylenediamine

2017

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The stability constants of the complexes formed in the N,N '-bis(5-methylsalicylidene)-4-methyl-1,3-phenylenediamine (H 2 L) and La(III), Eu(III), Gd(III), Ho(III), and Lu(III) ion systems were determined in solution with the potentiometric method. The pH-metric titrations were performed in dimethyl sulfoxide/water (v:v, 30:70) mixture at 25.0 °C in 0.1 M LiNO 3 ionic strength. The tests were performed for systems with Ln(III) to H 2 L 1:2 and 1:3 molar ratio but only data of the systems with the metal/ligand ratio 1:2 were taken into calculation. The molar ratio 1:1 was not studied because of the high coordination numbers of the lanthanide ions, and inadequate donor atoms of the ligand. Computer analysis (HYPERQUAD software) of potentiometric data indicated that in solution the lanthanide (Ln) complexes exist as LnL 2 , Ln(HL) 2 , and Ln(H 2 L) 2 forms, depending on pH unlike to the solid state where only one form of Ln(H 2 L) 2 occurs. Formation constants increase with decreasing size of the Ln(III) ions. Moreover, complex formation in the Ln 3+ /H 2 L systems in solution was performed using UV-Vis spectrophotometric titration.

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Section: Potentiometric Measurementsmentioning

confidence: 99%

Section: Synthesis Of Nn'-bis(5-methylsalicylidene)-4-methyl-mentioning

confidence: 99%

Potentiometric determination of novel complexes of selected lanthanide ions with N,N’-bis(5-methylsalicylidene)-4-methyl-1,3-phenylenediamine

2017

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“…In 80:20 (w/w) DMSO:water mixed solvent the electrode system was calibrated according to Irving et al [14]. Under our conditions the autoprotolysis constant of water is pK w = 18.40 [15,16]. In both solvents, the calibration parameters were calculated by the non-linear least squares method.…”

Section: Ph-metric Measurementsmentioning

confidence: 99%

N-terminal fragment of the anti-angiogenic human endostatin binds copper(II) with very high affinity

Kolozsi

Jancsó

Nagy

et al. 2009

Journal of Inorganic Biochemistry

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“…Weak antiferromagnetic interaction is taking place through phenoxo bridges in the present case. Co1-O-Co1# angle is 100.01°and the weak antiferromagnetism is associated with the structural parameters [2,4,5,[20][21][22][23].…”

Section: Magnetic Studiesmentioning

confidence: 99%

“…The ground term of high-spin cobalt(II) possess an orbital angular momentum, as a consequence significant interest has been attracted in the synthesis and characterization of high-spin binuclear cobalt(II) complexes in order to understand the magnetic behavior of such species in a better way [1][2][3][4]. Besides the isovalent dimeric cobalt complexes, the study of sparsely known high-spin, lowspin Co(II)/Co(III) mixed valence system [5][6][7][8][9] allows one to examine the physicochemical properties and the behavior of the unpaired electrons.…”

Section: Introductionmentioning

confidence: 99%

Binuclear cobalt(II/II) and cobalt(II/III) chelates with O2N2 ligands: synthesis, structure and magnetic studies

Singh

Banerjee

Gordon

et al. 2009

Transition Met Chem

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The title complexes ½Co II 2 L 1 2 and ½Co II Co IIIðOAc)L 2 2 have been synthesized in excellent yields by reacting Co(OAc) 2 Á4H 2 O with H 2 L 1 and H 2 L 2 , respectively, in acetonitrile solution. Here, [L 1 ] 2-and [L 2 ] 2-are the deprotonated forms of N,N-bis(2-hydroxybenzyl)-N 0 ,N 0 -dimethylethylenediamine and N,N-bis(2-hydroxybenzyl)-2-picolylamine, respectively. The crystal structures of ½Co II 2 L 1 2 and ½Co II Co III ðOAc)L 2 2 ÁH 2 OÁCH 2 Cl 2 were determined by x-ray crystallography. In ½Co II 2 L 1 2 , each cobalt atom has distorted trigonal bipyramid geometry, while in ½Co II Co III ðOAc)L 2 2 , each cobalt atom has distorted octahedral geometry. Variable temperature magnetic moment measurements show weak antiferromagnetic interaction in ½Co II 2 L 1 2 . The magnetic characterization for ½Co II Co III ðOAc)L 2 2 is in agreement with the presence of Co(II) and Co(III) centers.

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Dimer species in dimethyl sulfoxide–water (80∶20 w/w) solution of N,N′-bis(salicylideneimine)-m-phenylenediamine (H2sal-m-phen) and similar Schiff bases with CuII, NiII, CoII and ZnII. Crystal structure of [Co2(sal-m-phen)2]·CHCl3 ‡

Cited by 42 publications

References 28 publications

Potentiometric determination of novel complexes of selected lanthanide ions with N,N’-bis(5-methylsalicylidene)-4-methyl-1,3-phenylenediamine

Potentiometric determination of novel complexes of selected lanthanide ions with N,N’-bis(5-methylsalicylidene)-4-methyl-1,3-phenylenediamine

N-terminal fragment of the anti-angiogenic human endostatin binds copper(II) with very high affinity

Binuclear cobalt(II/II) and cobalt(II/III) chelates with O2N2 ligands: synthesis, structure and magnetic studies

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