SYNTHESIS OF UNSYMMETRICAL RUTHENIUM(II) SANDWICH COMPLEXES CONTAINING LARGE POLYCYCLIC BENZENOID AROMATIC LIGANDS AND THE X-RAY CRYSTAL-STRUCTURE OF [(ETA-6-PYRENE)(ETA-6-4-(METHYLISOPROPYL)BENZENE)RUTHENIUM][BF4]2

A new series of Ru(II) sandwich complexes has been prepared by reacting (4-(methylisopropyl)benzene)Ru2+ with pyrene, triphenylene, 4H-cyclopentaphenanthrene, 4,5-benzopyrene, and 1,2:5,6-dibenzanthracene. An X-ray crystal structure of the pyrene complex was determined, and it was found that the Ru atom coordinates in an eta6 manner to the six arene carbon atoms of the 4-(methylisopropyl)benzene ligand and one of the rings of the pyrene molecule to form an unsymmetrical sandwich complex. The crystals are triclinic, space group P1BAR, with lattice constants a = 12.909(6) angstrom, b = 13.359(7) angstrom, c = 17.150(5) angstrom, alpha = 105.20(3)-degrees, beta = 105.20-(4)-degrees, gamma = 105.91(4)-degrees, and V = 2626(2) angstrom3.