Synthesis and structural characterization of carborane-containing neutral, self-assembled Pt-metallacycles

We have combined carborane chemistry with the newly developed directional bonding strategy to synthesize neutral macrocycles. The m- and p-carborane dicarboxylates were utilized as the donor linkers in conjunction with 1,8-bis[traiis-Pt(PEt(3))(2)NO(3)]antliracene 3, 2,9-bis[trans-Pt(PEt(3))(2)NO(3)]-phenanthrene 5, and cis-Pt(PEt(3))(2)(NO(3))(2) unit 6. Three new platinum-based macrocycles, 4, 7, and 8, were thus synthesized. (31)P{(1)H} NMR as well as the X-ray characterization of Pt-metallacycles reveal the formation of single highly symmetrical neutral species.