Chloro(3- or 5-aminoquinoline)rhodium(I) organocomplexes showing N–H⋯Cl and C–H⋯Rh weak interactions

Abstract

The reaction of [RhCl(L 2)] 2 with 3- or 5-aminoquinoline ( n-aqui) gives neutral tetracoordinated rhodium(I) compounds [RhCl(L 2)( n-aqui)] (L 2=COD, n-aqui=5-aqui 1, 3-aqui 2; L 2=NBD, n-aqui=5-aqui 3, 3-aqui 4) with n-aqui bonded through the heterocyclic nitrogen. Structures of complexes 1 and 2 were determined by single crystal X-ray diffraction. Both compounds show intermolecular hydrogen bond N–H⋯Cl linkages and contain doubly hydrogen-bonded ‘dimer pairs’. In 1 additional N–H⋯Cl interactions between the ‘dimer pairs’ gives double chains along the y-axis. Compound 2 crystallises as diethyl ether adduct, 2·Et 2O and the ‘dimer pairs’ form N–H⋯O hydrogen bonds with solvation molecules. For 1 a C–H⋯Rh interaction is observed in the crystal. In solution, compounds 1– 4 undergo intra- and intermolecular processes that are discussed. The reaction of [RhCl(CO) 2] 2 with n-aqui gives monomers [Rh(Cl)(CO) 2( n-aqui)] ( n-aqui=5-aqui 5, 3-aqui 6) with n-aqui bonded through the heterocyclic nitrogen when Rh: n-aqui=1:1 or the dimer compound with bridging ligand, [Rh(Cl)(CO) 2] 2(μ-5-aqui) ( 7) when Rh:5-aqui=2:1.