Synthesis, Structure and Properties of Manganese(II) Complexes with Aroylhydrazones of 2-pyridinecarboxaldehyde

Abstract

Manganese(II) complexes of terdentate N,N,0 donor Schiff bases (HL) are described. The ligands Hpabh, Hpamh and Hpadh are obtained by condensing 2-pyridine-carboxaldehyde with Manganese(II) complexes of terdentate N,N,O donor Schiff bases (HL) are described. The ligands Hpabh, Hpamh and Hpadh are obtained by condensing 2-pyridine-carboxaIdehyde with benzhydrazide, 4-methoxybenzhydrazide and 4-dimethyIaminobenzhydrazide, respectively. The reaction of HL with manganese(II) acetate tetrahydrate affords [MnL2]. The crystal structure determination of [Mn(pabh)2] was performed. The complex crystallises in the space group P21/n with a = 9.836(3), b = 23.994(7), c = 10.222(3)Å, ß= 104.14(3)°, V = 2339.5(13)Å3 and Z = 4. In the distorted octahedral MnN4O2 coordination sphere each ligand acts as a meridional N,N,O donor utilising pyridine-N, imine-W and amide-O atoms. Electronic spectra of the complexes display charge transfer bands in the range 404-298 nm. Room temperature solid state magnetic moments (5.88-6.12µB) of the complexes are consistent with a high-spin d5 system. EPR spectra of the complexes suggest a similar distorted octahedral N4O2 coordination sphere around Mn(II) in each complex.benzhydrazide, 4-methoxybenzhydrazide and 4-dimethylaminobenzhydrazide, respectively. The reaction of HL with manganese(II) acetate tetrahydrate affords [MnL2]. The crystal structure determination of [Mn(pabh)2] was performed. The complex crystallises in the space group P21/n with a = 9.836(3), b = 23.994(7), c = 10.222(3)Å, ß = 104.14(3)°, V. =. 2339.5(13)Å3 and Z = 4. In the distorted octahedral MnN4O2 coordination sphere each ligand acts as a meridional N,N,0 donor utilising pyridine-N, i. m. i. n. e. -. N. and amide-O atoms. Electronic spectra of the complexes display charge transfer bands in the range 404-298 nm. Room temperature solid state magnetic moments (5.88-6.12ßB) of the complexes are consistent with a high-spin d5 system. EPR spectra of the complexes suggest a similar distorted octahedral N4O2 coordination sphere around Mn(II) in each complex.

Department(s)

Chemistry

Keywords and Phrases

Amide; Manganese(II); X-ray Structure

International Standard Serial Number (ISSN)

0095-8972

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1999 Taylor & Francis, All rights reserved.

Publication Date

01 Jun 1999

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