Bismuth Phosphinates: Temperature-Dependent Formation of a Macrocycle and 1D Coordination Polymer

GRAPHICAL ABSTRACT

Abstract

The reaction of Ph₃Bi with a sterically hindered phosphinic acid, 1,1,2,3,3-pentamethyltrimethylene phosphinic acid, {cycP(O)OH·2H₂O}, at two different temperatures, one at refluxing conditions and another at room temperature, in tetrahydrofuran has been investigated. At refluxing conditions, cleavage of two Bi-C bonds (of BiPh₃) leads to the formation of a 16-member macrocycle [(PhBi)₄(cycPO₂)₈] (1). On the other hand, the reaction at room temperature leads to the cleavage of one Bi-C bond only, affording a 1D polymer [(Ph₂Bi)(cycPO₂)]_n, ((1,1,2,3,3-pentamethyltrimethylene phosphinate is denoted as cycPO₂) (2). Both the complexes were characterized by single crystal X-ray diffraction. In both complexes the phosphinate ligands are present in an anisobidentate (bridging) coordination mode.

Keywords:

• Bismuth
• phosphinates
• coordination polymer