New Cu^I₂(TCNQ^–II) and Cu^I₂(F₄TCNQ^–II) Coordination Polymers

Abstract

Coordination polymer strips of composition\n...Cu⁺₂·lig^2–·Cu⁺₂·lig^2–·Cu⁺₂·lig^2–... (where lig^2– = TCNQ^2– or its 2,3,4,5-tetrafluoro analogue)\nare observed with a wide range\nof coligands (monodentate, bidentate, and tridentate). Interdigitation\nof “thin”, planar N-heteroaromatic coligands on one\nstrip with those on a neighbor is a common structural feature. Coligands\ntoo bulky to allow interdigitation give either non-interdigitating\nstrips or 2D sheet structures. Both strips and sheets have 2-connecting\nCu centers and 4-connecting tetracynano ligands. As a consequence\nof the great flexibility of the Cu/tetracyano ligand association,\nthe geometries of the sheet structures vary widely from almost coplanar\nto highly corrugated and convoluted, despite which the same topology\nis present in all.