Doubly Supported Cyclodimer. Structural Features of Copper(II) Nitrate with 1,4-Bis(dimethyl-3-py ridy lsilyl)benzene

摘要

Elegant construction of metal coordination complexes with specific motifs is a thematic issue since the coordination materials have potential applications such as molecular separation, toxic materials adsorption, molecular containers, ion exchangers, molecular recognition, and luminescent sensors. Thus, various kinds of framework molecules have been synthesized by the coordinations of metal ions with tailor-made organic tectonics even though serendipitous motifs have been frequently formed owing to the presence of unpredictable weak interactions such as hydrogen bonds, van der Waals forces, metal-metal interactions, and pi-pi interactions. The molecular structures of multidentate N-donor ligands including flexibility play key roles in the construction of the coordination materials. Recently, we have demonstrated that various silicon-containing pyridyl ligands are useful for the synthesis for desirable skeletal structures since the ligands are adjustable in their potential bridging ability and length, possess flexible angles around silicon, and are conformationally non-rigid. On the other hand, dinuclear Cu(II) complexes have been a significant field owing to the following reasons: (i) they can be prepared by the normal methods using bridging ligands, (ii) they provide useful simple models for the study of the magnetic interaction of two unpaired d electrons, and (iii) they are useful models of the biological copper systems.24 These factors have provided major incentives in the researches of novel dimeric copper(II) complexes. In order to expand the dimeric cupper(II) chemistry, the slow diffusion of Cu(NO3)2 in methanol with 1,4-bis(dimethyl-3-pyridylsilyl)benzene in dichloromethane was accomplished. Herein, we report a doubly supported cyclodimeric cupper(II) complex with methanol molecules as a sixth ligand.