Synthesis and characterization of the cyclodiphosphazane embedded macrocycle tetrabromo-resorcin[4]arene-tetrakis(cyclodiphosphazane) and its tetra-rhodium(i) complex

Abstract

The synthesis of a cyclodiphosphazane embedded macrocycle, tetrabromo-resorcin[4]arene-tetrakis(cyclodiphosphazane) [(μ-N(^tBu)P)₂{μ-(C₆HBr(o-O)₂-m-CHⁿBu)}]₄ (1), and its tetra-rhodium(I) complex [(μ-N(^tBu)P)₂{μ-(C₆HBr(o-O)₂-m-CHⁿBu)}Rh(COD)Cl]₄ (2) is described. The resorcin[4]arene backbone adopts a C_4v symmetric crown conformation in 1, which transforms into a C_2v symmetric boat conformation upon complexation with Rh(I) in the tetra-rhodium(I) complex 2, as evidenced by NMR spectroscopy and X-ray diffraction studies.