SYNTHESIS AND STRUCTURAL FEATURES OF COPPER(II) COMPLEXES OF BENZOIC ACID AND METHYL SUBSTITUTED BENZOIC ACID HYDRAZIDES AND X-RAY STRUCTURE OF Cu[C6H5CONHNH2]2(NO3)2

Odunola, O. A.; Adeoye, I. O.; Woods, Joseph Anthony Orighomisan

doi:10.1081/sim-120004447

Cited by 21 publications

(10 citation statements)

References 23 publications

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“…This ν(N-H) stretching frequency of the amino observed at 3539 cm -1 on coordination was lowered to between 3345-3199 cm -1 for the Co(II) complexes while for the Cu(II) complexes the bands were observed between 3357-3278 cm -1 . The observed values are consistent with previous studies [23][24][25][26] .…”

Section: Resultssupporting

confidence: 93%

“…This band was found at 1620 cm -1 for PM3 and 1540 cm -1 for DFT calculations, respectively. This band also experienced bathochromic shift on coordination to the metal between 1556-1507 and 1542-1507 cm -1 for the Co(II) and Cu(II) complexes studied, respectively [23][24][25][26] . The calculated 'amide II' for both the Co(II) and Cu(II) complexes were at 1608-1598 cm -1 for PM3 and 1535-1525 cm -1 for DFT, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…An additional band observed in the ultraviolet spectra of the complexes between 31,646-33,223 cm -1 was attributed to π→π* transition. The charge transfer transitions were observed at 23,256-29,497 cm -1 in the complexes 12,13,[23][24][25][26] .…”

Section: Resultsmentioning

confidence: 99%

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Synthesis, Characterization and Quantum Chemical Studies of Some Co(II) and Cu(II) Complexes of Acetoacetic Acid Hydrazide

Adekunle¹,

Semire²,

Odunola³

2013

Asian J. Chem.

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Transition metal complexes of hydrazides have been intensely investigated by coordination chemists because of their interesting structural properties and their wide ranging applications 1-5. Aliphatic carboxylic acid hydrazides among many other uses are employed as metal ion removal from waste waters 6 , aromatic hydrazides are used as stabilizers for rigid PVC against therm-oxidative degradation 7. Hydrazides are also used for the extraction of non-ferrous metals and rare earth from aqueous solutions 8-10,11. The coordinating ability of hydrazides to a variety of elements particularly transition metals afford the study of the metals in such systems. In continuation of our studies on alkyl acetoacetate hydrazides 12,13 we present the results of our investigations on the synthesis, spectral and the theoretical studies of Co(II) and Cu(II) complexes of acetoacetic acid hydrazide. The complexes are new and represent the first systematic study of acetoacetic acid hydrazide series. EXPERIMENTAL Reagents grade cobalt(II) acetate tetrahydrate, cobalt(II) chloride hexahydrate, cobalt(II) sulphate heptahydrate, copper(II) acetate monohydrate, copper(II) chloride dihydrate, copper(II) sulphate pentahydrate, copper(II) nitrate pentahydrate, ethylacetoacetate, hydrazine hydrate, methanol were available from BDH.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

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Synthesis, Characterization and Quantum Chemical Studies of Some Co(II) and Cu(II) Complexes of Acetoacetic Acid Hydrazide

Adekunle¹,

Semire²,

Odunola³

2013

Asian J. Chem.

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“…The -CONHNH 2 moiety of hydrazides have attracted considerable interest in the literature partly because of their coordinating ability to chelate a variety of transition metal ions [1][2] and their importance of organic chemistry since they are included in retro-bispeptides [3][4][5] which are used to design enzyme substrate mimics and potential inhibitors and in aliphatic polyamides [6][7][8][9] which display structures different to the extended conventional ones. However the number of studies about molecular and electronic structures of the hydrazides moiety is scarce 10 .…”

Section: Introductionmentioning

confidence: 99%

Quantum Chemical Study on Molecular and Electronic Structures of Methyl and Methoxyl Substituted Cu(II) and Ni(II) Benzoic Acid Hydrazides Ions

Adeoye

Odunola

Oladipo

et al. 2007

Journal of Chemistry

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The electronic structures of model methyl and methoxyl substituted benzoic acid hydrazides of Ni(II) and Cu(II) complexes have been studied both at semi empirical level (PM3). Theortho-methoxyl is relatively stable which may be due to the formation of hydrogen bonds between methoxyl oxygen and hydrogen on hydrazide (CH30---HNNH; 1.817Å for Cu(II) and 1.806∼1.839∼ for Ni(II)). The change in torsion in the complexes affectπ-electrons delocalization (complexes containingπ-electrons system) and consequently affect the band gap which is a measure of electronic properties that control the reactivity of the complexes. The curves fororthoandparamethoxyl substituted Cu(II) complexes intercept at 50°and 135°-144°, this could suggest that both complex ions can co-exist and react in very similar ways in solution under certain conditions.

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“…A lot of copper complexes with aliphatic and aromatic acids hydrazides were obtained [1][2][3][4][5][6]. Complexes of copper(II) with the N',N'-dialkyl hydrazides derivatives with long hydrocarbon radicals are soluble in organic solvents, which allows using these compounds for copper extraction.…”

mentioning

confidence: 99%

Extraction and complexation of copper(II) with para-tert-butylbenzhydrazide and its N′,N′-dimethyl derivative

2012

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SYNTHESIS AND STRUCTURAL FEATURES OF COPPER(II) COMPLEXES OF BENZOIC ACID AND METHYL SUBSTITUTED BENZOIC ACID HYDRAZIDES AND X-RAY STRUCTURE OF Cu[C₆H₅CONHNH₂]₂(NO₃)₂

Cited by 21 publications

References 23 publications

Synthesis, Characterization and Quantum Chemical Studies of Some Co(II) and Cu(II) Complexes of Acetoacetic Acid Hydrazide

Synthesis, Characterization and Quantum Chemical Studies of Some Co(II) and Cu(II) Complexes of Acetoacetic Acid Hydrazide

Quantum Chemical Study on Molecular and Electronic Structures of Methyl and Methoxyl Substituted Cu(II) and Ni(II) Benzoic Acid Hydrazides Ions

Extraction and complexation of copper(II) with para-tert-butylbenzhydrazide and its N′,N′-dimethyl derivative

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