44 (3)° and space group 2/M. The single crystal structure of the complex shows the bonding of chromium metal to 2-methylpyrazine through the less sterically hindered nitrogen-4 lone pair. The pyrazine ring plane makes an angle of 179.58° (19) with COCrN bond axis. The four carbonyl groups are slightly bent away from pyrazine with the angle of 91.28° (17) for C5CrN1 bond axis. The DFT calculations run
从
正己烷溶液中分离出五羰基(
2-甲基吡嗪)
铬(0)[Cr(CO)5(2mpyz)],为橙色板状晶体,通过IR,NMR光谱和X射线晶体学对其进行表征。晶体学结果表明,该配合物在单斜晶系统中结晶,晶胞参数为a = 7.176(5),b = 12.045(3),c = 14.461(3)Å,β = 90.44(3)°和空间组2 / M。配合物的单晶结构表明,
铬的
金属通过较少空间受阻的N-4孤对与
2-甲基吡嗪结合。
吡嗪环平面与CO Cr的夹角为179.58°(19)N键轴。对于C 5 Cr N1键轴,四个羰基略微远离
吡嗪弯曲,呈91.28°(17)的角度。使用高斯03 PC程序进行的DFT计算与实验结果显示出良好的一致性。还通过差热分析和热重分析技术研究了配合物的热性质。