bis-terphenyl complexes of molybdenum and tungsten with general composition M2(Ar')(O2CR)3 and M2(Ar')2(O2CR)2, respectively (Ar' = terphenyl ligand), that contain carboxylate groups bridging the quadruply bonded metal atoms, have been prepared and structurally characterized. The new compounds stem from the reactions of the dimetal tetracarboxylates, M2(O2CR)4 (M = Mo, R = H, Me, CF3; M = W, R = CF3)
钼和
钨的单和双三
联苯配合物,其一般组成分别为 M2(Ar')(O2CR)3 和 M2(Ar')2(O2CR)2(Ar' = 三
联苯配体),其中包含桥接四重键合的
金属原子,已被制备和结构表征。新化合物源于二
金属四
羧酸盐 M2(O2CR)4 (M = Mo, R = H, Me,
CF3; M = W, R = ) 与合适的三
联苯基的
锂盐 (Ar' = Ar(Xyl2)、Ar(Mes2)、Ar(Dipp2) 和 Ar(Trip2))。一个双齿
羧酸酯被单齿三
联苯取代形成 MC σ 键并在另一个
金属原子上产生配位不饱和。因此,在 M2(Ar')2(O2CR)2 配合物中,两个
金属原子形式上具有低配位数和低电子数。然而,