Self-assembly Through Non-coordinating Intermolecular Forces, Part 2 [1]. Synthesis, Crystal Structure and Packing of [Cu2(μ-phthalazine)3(phthalazine)2][CF3SO3]2

Treatment of the copper(I) trifluoromethanesulphonate toluene complex {[Cu(CF3SO3)](2) C6H5Me} (1) with phthalazine (phtz, C8H6N2) in dichloromethane-acetonitrile solution yielded, via the bis(acetonitrile)tris(mu-phthalazitle)dicopper(I) trifluoromethanesulphonate intermediate (2), the novel bis(phthalazine)tris(mu-phthalazine)dicopper(I) trifluoromethanesulphonate salt (3). Compound 3 was completely characterised and the molecular Structure determined by single-crystal X-ray diffraction. Complex 3 crystallises in the monoclinic system, space group C2/c, with a = 26.9527(10), b = 10.9558(7), c = 19.2104(10) angstrom, beta = 127.268(2)degrees, V = 4514.3(4) angstrom(3) and Z = 4. The copper(I) coordination geometry is tetrahedral, each copper centre being linked to four phthalazine molecules. Dicationic units of 3 which present all unusual paddle wheel-like shape Constitute appropriate organometallic building blocks for the construction of a supramolecular solid-state architecture. The analysis of the packing of the molecules of 3 in the crystal revealed an unprecedented 2-dimensional network. resulting from intermolecular pi-pi and electrostatic interactions.