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Preparation and Crystal Structure of a Phenoxo-Bridged Dinuclear Copper(II) Complex with N-Salicylidene-2-hydroxy-5-bromobenzylamine

Yoshihisa KAKUTA, Michihiro KURUSHIMA, Daisuke YOSHIOKA, Masahiro MIKURIYA
2010 X-ray Structure Analysis Online  
N-Salicylidene-2-hydroxybenzylamine and its substituted derivatives are unique ligands having two phenolic-oxygen and one imino-nitrogen donor atoms, forming mononuclear manganese(IV) 1 and vanadium(IV) 2 complexes and dinuclear vanadium(V), 2 iron(III), 3 and copper(II) 4 complexes with a meridional O,N,O-chelating. Recently, we found that one of these ligands forms a hydrogen-bonded dimer structure in the crystal. 5 Concerning the dimer structure, we are interested in the dinuclear structure
more » ... inuclear structure of phenoxo-bridged copper(II) complexes with these ligands. Although we reported on the crystal structure for one of these, the title compound, before (Fig. 1) , the X-ray diffraction data were measured at room temperature and were not sufficient to get good-quality data, and the structural detail had not been described in the literature. 4 We also reported preliminary magnetic susceptibility data, and interpreted the magnetic data by a dimer model based on the room-temperature structure. 4 In order to understand the magnetic property of the complex exactly, it is desirable to confirm the low-temperature structure. In this study, we determined the crystal structure of the title compound at 90 K. The title compound was prepared by a previously reported procedure. 4 A mixture of 2-hydroxy-5-bromobenzylamine (20 mg, 0.1 mmol) and salicylaldehyde (12 mg, 0.1 mmol) dissolved in 3 mL of dimethyl sulfoxide was heated gently. To this solution was added copper(II) acetate (18 mg, 0.1 mmol), and the mixture was heated with stirring for 40 min, and then filtered. The resulting green solution was allowed to stand at X-ray Structure Analysis Online
doi:10.2116/xraystruct.26.49 fatcat:2xm2grry5jhpfgmze23vpmbxdu