6.14]写出下列分子的结构式,使其符合十八电子规则:-|||-(1)V2(CO)12;-|||-(2)Ni2(CO)2(C3H5)(羰基成桥);-|||-(3)Cr2(CO)4[C5H ]2;-|||-(4) ([ {C)_({P)_(3)}M(O)_(3)((CO))_(6)((H)_(3)-S)] }^+;-|||-(5) ([ {H)_(3)R(e)_(3)((CO))_(10)] }^2- (有2个 Re-Re 单键,1个 Re-Re 双键)。