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Mononuclear and dinuclear manganese complexes with2,6-bis[N-(2-pyridylethyl)iminomethyl]-4-methylphenol (HL), [MnII2(L)(CH3COO)2(CH3OH)](ClO4) (1), [MnII2(L)(CH3COO)2(NCS)] (2), [MnII(HL)(NCS)2(H2O)] (3), [MnIIMnIII(L)(CH3COO)2(CH3OH)2](ClO4)2 (4), [MnIIMnIII(L)(CH3COO)2(NCS)2] (5), [MnIIMnIII(L)(CH3COO)2(N3)2]·2CH3OH (6), and [MnIII(HL)(N3)3] (7), have been prepared and characterized by infrared, electronic, and ESR spectra, as well as the temperature dependence of the magnetic susceptibilities (80—300 K). The molecular structures of 1, 2, 3, 6, and 7 were determined by single-crystal X-ray structure analyses. Complexes 1 and 2 have a μ-phenoxo-di-μ-acetato-bridged dinuclear structure, in which one manganese atom is five-coordinated and the other six-coordinated. Complex 6 is a μ-phenoxo-di-μ-acetato-bridged dinuclear molecule comprising an octahedral Mn(II) atom and an elongated-octahedral Mn(III) atom. The manganese atoms of 3 and 7 are six-coordinated in a distorted octahedral environment. The spectral and magnetic properties are discussed in relation to the crystal structures.

Binuclear and mononuclear manganese(II) complexes with 2,6-bis[N-(2-pyridylethyl)iminomethyl]-4-methylphenol (HL), [Mn2(L)(CH3COO)2(NCS)] and [Mn(HL)(NCS)2(H2O)], have been prepared and characterized by X-ray structure analyses, magnetic susceptibilities (80–300 K), and EPR spectrum.

An active ingredient of peptic ulcer healing agent “Colloidal Bismuth Subcitrate (CBS)” has been isolated by crystallization from a solution containing bismuth citrate and ammonia. The single-crystal X-ray structure analysis has demonstrated that it consists of unique anionic hexanuclear bismuth oxo-hydroxo-citrato clusters connected by ammonium ions and weak citrate bridges.

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