ORTHOMETALATION OF 6-AMINO-1,3-DIMETHYL-5-PHENYLAZOURACIL - CRYSTAL STRUCTURE AND SPECTROSCOPIC PROPERTIES OF TRANS-[(RHCL2)-CL-III(L)(H2O)]CENTER-DOT-3H(2)O

摘要

The preparation and spectroscopic characterization of two iso-structural complexes trans-[Rh(III)X(2)(L)(H2O)]. 3H(2)O (HL is 6-amino-1,3-dimethyl-5-phenylazouracil and X stands for Cl and Br) are reported. In addition, the crystal structure of the complex trans-[Rh(III)X(2)(L)(H2O)]. 3H(2)O has been solved and refined to R = 0.039 (R(W) = 0.045). The compound crystallizes in the triclinic space group (No. 2) with cell constants a = 7.395(4), b = 11.412(3), c = 11.776(4) Angstrom, alpha = 77.42(2), beta = 75.14(3), gamma = 78.67(2)degrees, V = 927(2) Angstrom(3), Z = 2, D-c = 1.74 g cm(-3), D-exp = 1.75(2) g cm(-3), F(000) = 510, mu(Mo K alpha) = 1.305 mm(-1). In this complex the ligand undergoes orthometalation, coordinating in a monodeprotonated tridentate fashion through an exocyclic oxo group, the azo group and the carbon atom of the phenyl ring ortho to the azo group. The three remaining positions are occupied by two chlorine atoms in trans position and a water molecule. [References: 22]