Dirhodium tetracarboxylate complexes (C)Rh2(OAc)2 and (C)2Rh2, where C is a chelating dicarboxylate of general form meta-C6H4(OC(CH3)2CO2−)2, were prepared by heating Rh2(OAc)4 and diacids in N,N-dimethylaniline. The structures of six new complexes with one or two chelate rings were obtained, with pyridine ligands (or in one case N,N-dimethylaniline) co-ordinated to rhodium. The geometries of the molecules are similar, with the aromatic part of the chelate ring tilted out of the plane of the Rh–O cage by 57.5 to 66.6°. The monochelate Rh2C6H4(OC(CH3)2CO2)2-m}(OAc)2·2ButPy (ButPy = 4-tert-butylpyridine) packed in the crystal to generate a hexagonal network of channels of (minimum) diameter 5 Å due to vertical stacking of its axial pyridine ligands. Several other instances of intramolecular CH–π and intermolecular π–π interactions were noted in the packing diagrams. The bischelate Rh2Ar(OC(CH3)2CO2)2-m}2·PhNMe2, with Ar = 4,6-di-tert-butylphenyl, has a polymeric structure displaying a new mode of arene co-ordination. The aromatic ring of the N-bound aniline co-ordinates to a neighbouring dirhodium complex via the para carbon atom with a Rh–C distance of 2.709 Å.
通过在
N,N-二甲基苯胺中加热 Rh2(
OAc)4 和二元酸,制备了四
羧酸二
铑络合物 (C)Rh2(
OAc)2 和 (C)2Rh2,其中 C 是一般形式为 meta-
C6H4(OC(
CH3)2CO2-)2 的螯合二
羧酸盐。通过
吡啶配体(或一种情况下的
N,N-二甲基苯胺)与
铑配位,得到了六个具有一个或两个螯合环的新配合物的结构。这些分子的几何结构相似,螯合环的芳香部分与 Rh-O 笼的平面成 57.5 至 66.6°的倾斜。单螯合物 Rh2 (OC( )2CO2)2-m}(
OAc)2-2ButPy(ButPy =
4-叔丁基吡啶)由于其轴向
吡啶配体的垂直堆积,在晶体中形成了直径(最小)为 5 Å 的六边形通道网络。填料图中还显示了其他一些分子内 CH-π 和分子间 π-π 相互作用的情况。双螯合物 Rh2Ar(OC( )2CO2)2-m}
2-PhNMe2(Ar = 4,6-二
叔丁基苯基)具有聚合结构,显示出一种新的炔共配位模式。N 键
苯胺的芳香环通过对位
碳原子与邻近的二
铑配合物配位,Rh-C 间距为 2.709 Å。