title: Three ruthenocene derivatives: (eta(5)-4,7-dimethylindenyl)(eta(5)-pentamethylcyclopentadienyl)ruthenium(II), [eta(5)-[2](4,7)indeno[2]paracyclophanyl](eta(5)-pentamethylcyclopentadienyl)ruthenium(II) and bis[eta(5)-[2](4,7)indeno[2]paracyclophanyl]ruthenium(II).
abstract: In the title compounds, [Ru(C(10)H(15))(C(11)H(11))], (III), [Ru(C(10)H(15))(C(19)H(17))], (IV), and [Ru(C(19)H(17))(2)], (V), respectively, the coordinating ring systems are planar and parallel, with the Ru atoms lying at perpendicular distances of Ru-Cp* 1.790 (1) A and Ru-indenyl 1.836 (1) A in (III), Ru-Cp* 1.791 (1) A and Ru-indenyl 1.837 (1) A in (IV), and Ru-indenyl 1.812 (1) A and 1.809 (1) A in (V) (Cp* is pentamethylcyclopentadienyl). The ring conformations are eclipsed for (III), staggered for (IV) and intermediate for (V). All three compounds show short intermolecular contacts from C-H groups to some ring centroids; these could be regarded as C-H.pi hydrogen bonds. The molecules of each compound are thus connected via the 2(1) screw axis to form layers parallel to the xy plane.
authors.affiliation: Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Postfach 3329, 38023 Braunschweig, Germany. jones@xray36.anchem.nat.tu-bs.de
authors.forename: Peter G
authors.initials: PG
authors.lastname: Jones
authors.forename: Thorsten
authors.initials: T
authors.lastname: Hartig
authors.forename: Henning
authors.initials: H
authors.lastname: Hopf