Relevant data comparison of 1,2 and 3 showed that the difference of the bonddistances and bond angles due to different central metal atom is similar to the carbo-bridged analogues (CH_2)_3(C_5H_4)_2MCl_2.

• 化合物1；2和3的有关结构数据比较表明；由于中心金属的不同而引起其键长和键角的差异与其碳桥类似物(CH_2)_3(C_5H_4)_2MCl_2的情况相似.