Attractive ligand–ligand interactions involving aromatic rings in five-coordinate ternary copper(II) complexes with a dipeptide and a bidentate N-donor ligand
作者:Tatsuo Yajima、Maki Okajima、Akira Odani、Osamu Yamauchi
DOI:10.1016/s0020-1693(02)01039-3
日期:2002.11
Abstract Structures and stabilities of ternary copper(II) complexes, Cu(DP)(DA), where DP and DA denote dipeptides with an aromatic amino acid residue and bidentate nitrogen donor ligands, respectively, have been studied by synthetic, crystallographic, potentiometric, and spectroscopic methods. The X-ray crystal structure analysis of [Cu(gly· l- tyr)(bzp)] (gly· l- tyr=glycyl- l -tyrosinate, bzp=N
摘要已通过合成,晶体学,电位分析法研究了三元铜(II)配合物Cu(DP)(DA)的结构和稳定性,其中DP和DA分别表示具有芳香族氨基酸残基的二肽和双齿氮供体配体。和光谱方法。[Cu(gly·l-tyr)(bzp)](gly·l-tyr =甘氨酰基-1-酪氨酸盐,bzp = N-苄基-N-2-吡啶基甲胺)的X射线晶体结构分析表明,该络合物具有扭曲的方形金字塔结构,在bzp的吡啶环与gly·l-tyr的酚环(在Cu(II)中心附近)之间表现出分子内的边对面堆积相互作用。还发现[Cu(gly·l-tyr)(bzmp)](bzmp = N-苄基-N-6-甲基-2-吡啶基甲胺)具有相似的结构,并且甲基之间的分子内CH-π型相互作用bzmp基团和gly·l-tyr的苯酚环。三元Cu(II)-DP-DA系统在水中的吸收光谱表明,三元络合物在900 nm附近具有肩峰,这表明Cu(II)中心具有方形金字塔的几何形状。根据在25°C和I