Nuclear quadrupole resonance and crystallographic studies of three-co-ordinated copper(I) cations with alkylpyridine ligands
作者:Augustin Habiyakare、Edwin A. C. Lucken、G�rald Bernardinelli
DOI:10.1039/dt9920002591
日期:——
pyridine ligands twisted well out of the plane containing the copper and the three nitrogen atoms. In most cases one of the N–Cu–N bond angles is significantly greater than 120° while the length of the opposing bond is significantly greater than that of the two bonds that form this angle. All the NQR frequencies at 77 K are in the neighbourhood of 45 MHz, with the exception of that of the complex with
十四种三配位铜络合物阳离子的制备及63,65 Cu NQR共振频率(I)有烷基吡啶配体的报道。还确定了其中七个的晶体结构。络合物显示出各种各样的对称性,但是铜原子都不位于理想的三重轴上。在大多数情况下,铜处于基本为三角形的平面环境中,但至少有两个吡啶配体扭曲良好,偏离了包含铜和三个氮原子的平面。在大多数情况下,N–Cu–N键的角度之一明显大于120°,而相对键的长度明显大于形成该角度的两个键的长度。在77K的所有NQR频率在45兆赫的附近,与该复合物的异常与3,5-二甲基吡啶,唯一的配体不具有至少一个烷基取代基的邻位到氮原子,在77 K处的频率为40.471 MHz。这种差异是由于PF 6阴离子与铜阳离子的轴向配位所致。