title: cis-Dichlorido(1,3-dimesitylimidazolidin-2-yl-idene)(2-formyl-benzyl-idene-κC,O)ruthenium diethyl ether solvate.
abstract: The title compound, [RuCl(2)(C(8)H(6)O)(C(21)H(26)N(2))]·C(4)H(10)O, contains a catalytically active ruthenium carbene complex of the 'second-generation Grubbs/Hoveyda' type with Ru in a square-pyramidal coordination, the apex of which is formed by the benzyl-idene carbene atom with Ru=C 1.827 (2) Å. The complex shows the uncommon cis, rather than the usual trans, arrangement of the two chloride ligands, with Ru-Cl bond lengths of 2.3548 (6) and 2.3600 (6) Å, and a Cl-Ru-Cl angle of 89.76 (2)°. This cis configuration is desirable for certain applications of ring-opening metathesis polymerization (ROMP) of strained cyclic olefins. The crystalline solid is a diethyl ether solvate, which is built up from a porous framework of Ru complexes held together by π-π stacking and C-H⋯Cl and C-H⋯O inter-actions. The disordered diethyl ether solvent mol-ecules are contained in two independent infinite channels, which extend parallel to the c axis at x,y = 0,0 and x,y = , and have solvent-accessible void volumes of 695 and 464 Å(3) per unit cell.
authors.forename: Christian
authors.initials: C
authors.lastname: Slugovc
authors.forename: Bernhard
authors.initials: B
authors.lastname: Perner
authors.forename: Franz
authors.initials: F
authors.lastname: Stelzer
authors.forename: Kurt
authors.initials: K
authors.lastname: Mereiter