Synthesis and structural studies of complexes of Cu, Co, Ni and Zn with isonicotinic acid hydrazide and isonicotinic acid (1-naphthylmethylene)hydrazide

Abstract

Eight new complexes of Cu(II), Co(II), Ni(II) and Zn(II) with isonicotinic acid hydrazide (isoniazid, (INH)) and isonicotinic acid (1-naphthylmethylene) hydrazide (INNMH), having the formula of the type [M(INH)(ac)2] or [M(INNMH)(ac)2] (M = Co(II), Ni(II) and Zn(II)) and [Cu(INH)(ac)2]2, [Cu(INNMH)(ac)2]2, were synthesized and characterized. All complexes were characterized based on elemental analyses, and IR, UV-VIS-NIR and EPR spectroscopy, as well as by thermal analysis and determination of their molar conductivity and magnetic moments. The structure of INNMH was established by single crystal X-ray analysis. In all complexes, both ligands were coordinated to the metal via N and O. The complexes of Cu (II) were dimeric, with four bridges between acetate ions and Cu(II).

Synthesis, spectral and thermal aspect of transition metal coordination polymers with bis-hydrazone ligand

“…[25] The reflectance spectrum of the Co(II) coordination polymer exhibits bands at 8770, 12530 and 16690 cm -1 , which may correspond to 4 T 1g (F) → 4 A 2g (F), 4 T 1g (F) → 4 A 1g (P) and 4 T 1g (F) → 4 T 1g (P) respectively. [26] In dddinh Ni(II) coordination polymer three bands at 3 A 2g (F) → 3 T 2g (F), 3 A 2g → 3 T 1g (F) and 3 A 2g (F) → 3 T 1g (P) were observed respectively which shows octahedral geometry [27] and having magnetic moment value µ B :3.1BM . The reflectance spectrum (Figure 6) of Cu(II)…”

Metal Complexes of N-[Morpholine-4-Yl-(4- Nitrophenyl)-Methyl]-Benzamide: Synthesis, Characterization and Evaluation of Pesticidal and Larvicidal Activity

“…The electronic spectral measurements were used for assigning the structural relationships among the constituent groups of metal Table-3. [ 31,32,33,34] 1 H NMR spectrum of the ligand was recorded in DMSO-d6 medium using TMS as an internal standard and the spectrum is shown in Figure-3. The shift values and the corresponding assignments are summarized in Table-4.…”

Comparative Studies of New Complexes Synthesized by Chemical and Tribochemical Reactions Derived from Malonic Acid Dihydrazide (L; MAD) with Cu<sup>2+</sup> and Co<sup>2+</sup> Salts

“…Dihydrazide derivatives are polydentate ligands coordinating in neutral forms [2]. The applications of metal complexes in various fields like anti-inflammatory and analgesic have been extensively examined [3].…”