Complexes of Simple Carboxylic Acids

Oldham, C.

doi:10.1002/9780470166116.ch3

Cited by 136 publications

(7 citation statements)

References 158 publications

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“…The structure of the complexes depends upon factors such as the steric characteristics of the ligand, the stoichiometry of the complex, and reaction conditions (Bajju, 2002;Catterick and Thornton, 1977;MacDougall et al, 1976;Melnik, 1981;Valentine, et al, 1974). Oxygen donor organic ligands and pyridine-type nitrogen donors generally give antiferromagnetic complexes with copper(II) acetate (Bajju, 2002;Doedens, 1976;MacDougall, et al, 1976;Melnik, 1981;Melnik, 1982;Valentine et al, 1974), whereas saturated amine donors prefer to form magnetically dilute complexes (Kato et al, 1964;Melnik, 1981;Oldham, 1968;Stevens and Yoke, 1970). The influence of the steric and electronic characteristics of pyridine-type ligands on the structural and magnetic properties of their complexes with copper(II) acetate have been the subject of systematic investigations (Bajju 2002;Catterick and Thornton 1977;MacDougall et al, 1976;Valentine et al, 1974), but only a few reports exist on saturated heterocyclic bases.…”

Section: Introductionmentioning

confidence: 98%

“…Copper(II) acetate forms both magnetically dilute and antiferromagnetic complexes with nitrogen and oxygen donor ligands (Doedens, 1976;Kato et al, 1964;Melnik, 1981a,b;Melnik, 1982;Oldham, 1968). The structure of the complexes depends upon factors such as the steric characteristics of the ligand, the stoichiometry of the complex, and reaction conditions (Bajju, 2002;Catterick and Thornton, 1977;MacDougall et al, 1976;Melnik, 1981;Valentine, et al, 1974).…”

Section: Introductionmentioning

confidence: 98%

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Synthesis, Magnetic and Spectroscopic Characterization of Copper(II) Toluate Complexes with Substituted Piperazines

Manhas¹,

Sardana²,

Kalia³

2005

LSRT

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New copper(II) toluate complexes with the saturated heterocyclic bases [(L-L) having the tendency to coordinate through both 1 and 4 nitrogen atoms] 1-methylpiperazine, 1,4-dimethylpiperazine, 2,6-dimethylpiperazine and 1-phenylpiperazine have been prepared and characterized by physico-chemical and spectroscopic methods. All of the complexes were found to be antiferromagnetic with stoichiometries of the type Cu(OOCR) 2 (L-L) n (n 5 1 or 0.5, R 5 2-, 3-or 4-CH 3 C 6 H 4 ) except Cu(OOCC 6 H 4 CH 3 -4) 2 (L-L) (where L-L 5 2,6-dimethylpiperazine), which is magnetically dilute. The spin exchange parameter, 22J, for two of the antiferromagnetic complexes has been evaluated from magnetic susceptibility measurements at different temperatures. Binuclear copper(II) acetate monohydrate-like structure for the antiferromagnetic complexes of 1:1 stoichiometry and polymeric structure of the type Cu(OOCH) 2 (dioxan) 0.5 for the complexes of 1:0.5 stoichiometry have been proposed. The magnetically dilute complex has been assigned a polynuclear trans-pseudo-octahedral or polymeric square pyramidal structure.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Synthesis, Magnetic and Spectroscopic Characterization of Copper(II) Toluate Complexes with Substituted Piperazines

Manhas¹,

Sardana²,

Kalia³

2005

LSRT

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“…Both these compounds Fe 2 Cl 2 (O 2 CCBr 3 ) 4 and Fe 2 Cl(O 2 CCBr 3 ) 5 are hygroscopic solids insoluble in common organic solvents but soluble in nitromethane and acetonitrile to give red coloured solution. It is difficult to assign particular molecular formula to these compound but they are expected to be higher polymer like other iron(III) carboxylates [15]. e dimeric formulation for Metal-chlorine stretching frequencies usually reported [16,17] in the range 225-375 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Metal Tribromoacetates and Their Alkali Metal Derivatives

Puri

Chhoker

2012

Journal of Chemistry

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Complexes of composition Fe2Cl2(O2CCBr3)4, Fe2Cl(O2CCBr3)5, Fe (O2CCBr3)3, [(Me4N)2][Fe (O2CCBr3)4], K[Fe (O2CCBr3)4], Rb[Fe (O2CCBr3)4], Cs[Fe (O2CCBr3)4], [(Me4N)2][Co(O2CCBr3)4], [(Me4N)2][Mn(O2CCBr3)4], [(Me4N)2][Cu(O2CCBr3)4], and [(Me4N)2][Ni(O2CCBr3)4] have been prepared by metathetical reactions using nitromethane as solvent. All these compounds have been characterized by elemental analysis, molar conductance, infrared, reflectance and thermogravimetric studies.

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“…Definitely, the salts or the coordinative compounds of the carboxylic acids are appropriate and frequently used precursors in the aqueous sol–gel processes. These compounds are well known and accessible on a large scale for most elements . The reaction of hydrolysis of the carboxylate salts can lead to hydroxides and free acids.…”

Section: Introductionmentioning

confidence: 99%

“…These compounds are well known and accessible on a large scale for most elements. 28 The reaction of hydrolysis of the carboxylate salts can lead to hydroxides and free acids. Moreover, the multiple possibilities of bonding the -COO À to the metal ioninvolving ionic, bridging or coordinative bonds-can be used to obtain homogeneous gels in the multi-component systems.…”

Section: Introductionmentioning

confidence: 99%

Study of the Gelling Process in the La‐Co‐Citric Acid System

et al. 2011

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The gelling process in the aqueous lanthanum‐cobalt‐citric acid system was studied using UV‐VIS and IR spectroscopic methods, as well as viscosity measurements, to establish the gelling mechanism of transition metal ions (La3+ and Co2+) in the presence of chelating agent. Lanthanum and cobalt nitrates and lanthanum and cobalt acetates, respectively, were used as starting reagents, and the citric acid was used as chelating agent. The gelation process was investigated at room temperature and at 80°C. At elevated temperature, the gels were obtained after 30 h, whereas at room temperature, these were obtained in 1 month. Complex gels were formed for the both studied systems. The Co2+ ions mainly present an octahedral symmetry during the whole gelation process, whereas the citric acid acts as monodentate or bridging ligand depending on the metal precursors used. The mechanism of formation of the La‐Co‐CA based gels with the coordinative structures was proposed.

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Complexes of Simple Carboxylic Acids

Cited by 136 publications

References 158 publications

Synthesis, Magnetic and Spectroscopic Characterization of Copper(II) Toluate Complexes with Substituted Piperazines

Synthesis, Magnetic and Spectroscopic Characterization of Copper(II) Toluate Complexes with Substituted Piperazines

Synthesis and Characterization of Metal Tribromoacetates and Their Alkali Metal Derivatives

Study of the Gelling Process in the La‐Co‐Citric Acid System

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