Synthesis, spectroscopy and thermal analysis of copper(II) hydrazone complexes

Al‐Hazmi, Gamil A.A.; El‐Asmy, Ahmed A.

doi:10.1080/00958970802226411

Cited by 25 publications

(13 citation statements)

References 27 publications

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“…The hydrazones have also been used as herbicides, insecticides, nematocides, redenticides, and plant growth regulators [5] as well as plasticizers and stabilizers for polymers [7,8]. Furthermore, some hydrazones are used as quantitative analytical reagents, especially in colorimetric and fluorimetric determination of metal ions [4-6].…”

Section: Introductionmentioning

confidence: 99%

The ligational behavior of a phenolic quinolyl hydrazone towards copper(II)- ions

Seleem

El‐Inany

El‐Shetary

et al. 2011

Chemistry Central Journal

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BackgroundThe heterocyclic hydrazones constitute an important class of biologically active drug molecules. The hydrazones have also been used as herbicides, insecticides, nematocides, redenticides, and plant growth regulators as well as plasticizers and stabilizers for polymers. The importance of the phenolic quinolyl hydrazones arises from incorporating the quinoline ring with the phenolic compound; 2,4-dihydroxy benzaldehyde. Quinoline ring has therapeutic and biological activities whereas, phenols have antiseptic and disinfectants activities and are used in the preparation of dyes, bakelite and drugs. The present study is planned to check the effect of the counter anions on the type and geometry of the isolated copper(II)- complexes as well as the ligational behavior of the phenolic hydrazone; 4-[(2-(4,8-dimethylquinolin-2-yl)hydrazono)methyl] benzene-1,3-diol; (H2L).ResultsA phenolic quinolyl hydrazone (H2L) was allowed to react with various copper(II)- salts (Cl‾, Br‾, NO3‾, ClO4‾, AcO‾, SO42-). The reactions afforded dimeric complexes (ClO4‾, AcO‾ ), a binuclear complex (NO3‾ ) and mononuclear complexes (the others; Cl‾, Br‾, SO42-). The isolated copper(II)- complexes have octahedral, square pyramid and square planar geometries. Also, they reflect the strong coordinating ability of NO3‾, Cl‾, Br‾, AcO‾ and SO42- anions. Depending on the type of the anion, the ligand showed three different modes of bonding viz. (NN)0 for the mononuclear complexes (3, 4, 6), (NO)- with O- bridging for the dimeric complexes (1, 5) and a mixed mode [(NN)0 + (NO)- with O- bridging] for the binuclear nitrato- complex (2).ConclusionThe ligational behavior of the phenolic hydrazone (H2L) is highly affected by the type of the anion. The isolated copper(II)- complexes reflect the strong coordinating power of the SO42-, AcO‾, Br‾, Cl‾ and NO3‾ anions. Also, they reflect the structural diversity (octahedral, square pyramid and square planar) depending on the type of the counter anion.

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Section: Introductionmentioning

confidence: 99%

The ligational behavior of a phenolic quinolyl hydrazone towards copper(II)- ions

Seleem

El‐Inany

El‐Shetary

et al. 2011

Chemistry Central Journal

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“…The magnetic moment value (1.98 BM) of the complex 1 supports the presence of distorted octahedral structure, in which water molecule occupies the apical position, while that of complex 3 show the magnetic value of 1.82 BM corresponding to single unpaired electron reflecting square planar geometry [38]. The magnetic moment values of Co(II) complexes 2 and 4 have been found to be 4.68 and 5.03 BM, respectively showing three unpaired electrons which is within the range of values corresponding to high spin (sp 3 d 2 structure) octahedral complexes of Co(II) ion [39,40].…”

Section: Uv-visible Spectral and Magnetic Moment Studiesmentioning

confidence: 98%

Synthesis, characterization, antioxidant, antimicrobial, DNA binding and cleavage studies of mononuclear Cu(II) and Co(II) complexes of 3-hydroxy-N'-(2-hydroxybenzylidene)-2-naphthohydrazide

2011

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“…Dihydrazones derived from condensation of o-hydroxyaromatic aldehydes and ketones with acyldihydrazones, aroyldihydrazines, and pyridoyl dihydrazines are potential polyfunctional ligands which can bind with metal ions in various ways giving rise to monometallic, homopolymetallic, and heteropolymetallic complexes depending on the preferred stereochemical disposition of metal and the bonds formed in coordination. A survey of literature reveals that although metal complexes of monoacyl hydrazones, aroyl hydrazones, and pyridoyl hydrazones have been studied in detail [18][19][20][21], those of acyl-, aroyl-, and pyridoyl-dihydrazones have received attention in recent years only [22][23][24][25]. Heterobimetallic complexes derived from dihydrazones are quite meager [23,26] with not a single report of heterobimetallic complexes of dihydrazones containing succinoyl and bulky naphthyl fragments in their molecular skeleton.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of heterobimetallic Ni(II)–Zn(II) complexes from bis(2-hydroxy-1 -naphthaldehyde)succinoyldihydrazone

Lal¹,

Chakraborty²,

Chanu³

et al. 2010

Journal of Coordination Chemistry

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Monometallic zinc(II) and nickel(II) complexes, [Zn(H 2 nsh)(H 2 O)] (1) and [Ni(H 2 nsh)(H 2 O) 2 ](2), have been synthesized in methanol by template method from bis(2-hydroxy-1-naphthaldehyde)succinoyldihydrazone (H 4 nsh). Reaction of monometallic complexes with alternate metal(II) acetates as a transmetallator in 1 : 3 molar ratio resulted in the formation of heterobimetallic complexes [NiZn(nsh)(A) 3 ] and [ZnNi(nsh)(A 0 ) 2 ] (A ¼ H 2 O (3), py (4), 2-pic (5), 3-pic (6), 4-pic (7)), (A 0 ¼ H 2 O (8), py (9), 2-pic (10), 3-pic (11), and 4-pic (12)). The complexes have been characterized by elemental analyzes, mass spectra, molar conductance, magnetic moments, electronic, EPR, and IR spectroscopies. All of the complexes are non-electrolytes. Monometallic zinc(II) is diamagnetic while monometallic nickel(II) complex and all heterobimetallic complexes are paramagnetic. The metal centers in heterobimetallic complexes are tethered by dihydrazone and naphthoxo bridging. Zinc(II) is square pyramidal; nickel(II) is six-coordinate distorted octahedral except [ZnNi(nsh)(A) 2 ], in which nickel(II) has square-pyramidal geometry. The displacement of metal center in monometallic complexes by metal ion has been observed in the resulting heterobimetallic complexes.

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Synthesis, spectroscopy and thermal analysis of copper(II) hydrazone complexes

Cited by 25 publications

References 27 publications

The ligational behavior of a phenolic quinolyl hydrazone towards copper(II)- ions

The ligational behavior of a phenolic quinolyl hydrazone towards copper(II)- ions

Synthesis, characterization, antioxidant, antimicrobial, DNA binding and cleavage studies of mononuclear Cu(II) and Co(II) complexes of 3-hydroxy-N'-(2-hydroxybenzylidene)-2-naphthohydrazide

Synthesis and characterization of heterobimetallic Ni(II)–Zn(II) complexes from bis(2-hydroxy-1 -naphthaldehyde)succinoyldihydrazone

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