Manganese(II) complexes of pyridyl-azo-imidazoles. Single crystal X-ray structures of 3aaa-PyaiH and [Mn(3aaa- PyaiEt)4](ClO4)2 (3aaa-PyaiH=2-(3aaa-pyridyl
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Pyridine and imidazole are connected by an azo group (![]()
N![]()
N![]()
) to synthesize 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 >1.1 V 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)).