W(CO)5–Pyridine-π-acceptor complexes: synthesis, structure and electronic absorption spectra
作者:Asia Hameed、Agnieszka Rybarczyk-Pirek、Janusz Zakrzewski
DOI:10.1016/s0022-328x(02)01571-1
日期:2002.8
W(CO)5-complexes of 3-(4-pyridyl)propenal (1b), 5-(4-pyridyl)penta-2,4-dienal (1c), dimethyl (4-pyridylmethylene)malonate (2a), methyl 2-cyano-3-(4-pyridyl)acrylate (2b) and (4-pyridylmethylene)malononitrile (2c) have been synthesised. The molecular structures of 2b and 2c have been determined by X-ray diffraction. Significant distortions from the coplanarity of the WN bond and the pyridine rings
W(CO)5个-complexes的3-(4-吡啶基)丙烯醛(1B),5-(4-吡啶基)戊-2,4-二烯醛(1C),二甲基(4-吡啶基亚甲基)丙二酸二乙酯(2A),甲基合成了2-氰基-3-(4-吡啶基)丙烯酸酯(2b)和(4-吡啶基亚甲基)丙二腈(2c)。2b和2c的分子结构已经通过X射线衍射确定。在两个结构中都观察到了WN键和吡啶环平面共面性的显着变形。1b – c和2a – c的电子吸收光谱 显示出红移的MLCT带和很强的溶剂致变色现象。