A comparison of the receptor stereochemistry in [Pt(bipy)(NH3)2·dinaphtho-30-crown-10][PF6]2 and [Diquat·dinaphtho-30-crown-10][PF6]2(bipy = 2,2′-bipyridine)

Abstract

X-Ray crystallography and ¹H n.m.r. spectroscopy have revealed dramatic differences in the binding of [Pt(bipy)(NH₃)₂]²⁺ and [Diquat]²⁺ dications by dinaphtho-30-crown-10 (DN30C10) with the platinum complex adopting a slewed position, apparently in order to maximise overlap between the π-arene systems in the receptor and in the complex, whereas the Diquat dication adopts a symmetrical position more consistent with maximisation of Coulombic interactions.