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Manganese(II) complexes of pyridyl-azo-imidazoles. Single crystal X-ray structures of 3′-PyaiH and [Mn(3′- PyaiEt)4](ClO4)2 (3′-PyaiH=2-(3′-pyridylazo)imidazole; 3′-PyaiEt=1-ethyl-2-(3′-pyridylazo)imidazole)

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Title: Manganese(II) complexes of pyridyl-azo-imidazoles. Single crystal X-ray structures of 3′-PyaiH and [Mn(3′- PyaiEt)4](ClO4)2 (3′-PyaiH=2-(3′-pyridylazo)imidazole; 3′-PyaiEt=1-ethyl-2-(3′-pyridylazo)imidazole)
Authors: Mathur, T.1, Ray, U.S.1, Liou, J.-C.2, Wu, J.S.2, Lu, T.-H.2, Sinha, C.3 c_r_sinha@yahoo.com
Source: Polyhedron. Apr2005, Vol. 24 Issue 6, p739-746. 8p.
Subjects: Manganese compounds, Pyridine, Imidazoles, X-ray scattering
Abstract: Abstract: Pyridine and imidazole are connected by an azo group (h name="dbnd" />Nhesize 2-[(3′-pyridyl)azo]imidazole (3′-PyaiH) and this has been confirmed by X-ray structure determination. The N(1)-alkylation gives 1-alkyl-2-[(3′-pyridyl)azo]imidazole (3′-PyaiR′) (R′=Me (2a), Et (2b), Bz (2c)). The reaction between Mn(ClO4)2 ·6H2O and 3′-PyaiR′ in methanol has synthesized [Mn(3′-PyaiR′)4](ClO4)2 (3). The structure has been confirmed by single crystal X-ray diffraction study in one case, in addition to other spectral characterization. The structure reveals a tetrahedral orientation of four ligands coordinating through imidazole-N only. Cyclic voltammetry exhibits a Mn(III)/Mn(II) couple at >1.1V along with azo reductions. However, the reaction of MnCl2 ·4H2O+3′-PyaiR′ in the presence of NaN3 or NH4CNS (1:2:2 mole proportion) has synthesized Mn(3′-PyaiR′)2(X)2 (X=N3 (4), NCS (5)). [Copyright &y& Elsevier]
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Abstract:Abstract: Pyridine and imidazole are connected by an azo group (h name="dbnd" />Nhesize 2-[(3′-pyridyl)azo]imidazole (3′-PyaiH) and this has been confirmed by X-ray structure determination. The N(1)-alkylation gives 1-alkyl-2-[(3′-pyridyl)azo]imidazole (3′-PyaiR′) (R′=Me (2a), Et (2b), Bz (2c)). The reaction between Mn(ClO4)2 ·6H2O and 3′-PyaiR′ in methanol has synthesized [Mn(3′-PyaiR′)4](ClO4)2 (3). The structure has been confirmed by single crystal X-ray diffraction study in one case, in addition to other spectral characterization. The structure reveals a tetrahedral orientation of four ligands coordinating through imidazole-N only. Cyclic voltammetry exhibits a Mn(III)/Mn(II) couple at >1.1V along with azo reductions. However, the reaction of MnCl2 ·4H2O+3′-PyaiR′ in the presence of NaN3 or NH4CNS (1:2:2 mole proportion) has synthesized Mn(3′-PyaiR′)2(X)2 (X=N3 (4), NCS (5)). [Copyright &y& Elsevier]
ISSN:02775387
DOI:10.1016/j.poly.2005.01.017