A chloro(2-pyridinecarboxaldehyde)(2,2′:6′,2″-terpyridine) ruthenium(II) complex

Abstract

The aldehyde moiety in the title complex, chloro(2-pyridinecarboxaldehyde-N,O)(2,2′:6′,2″- terpyridine-k3N)ruthenium(II)-chloro(2-pyridinecarboxylic acid-N,O)(2,2′:6′,2″-terpyridine-k3N) ruthenium(II)-perchlorate-chloroform-water (1.8/0.2/2/1/1), [RuCl(C6H5NO)(C15H11 N3)]1.8[RuCl(C6H5 NO2)(C15H11N3)] 0.2(ClO4)2· CHCl3·H2O, is a structural model of substrate coordination to a transfer hydrogenation catalyst. The title complex features two independent RuII complex cations that display very similar distorted octahedral coordination provided by the three N atoms of the 2,2′:6′,2″-terpyridine ligand, the N and O atoms of the 2-pyridinecarboxaldehyde (pyCHO) ligand and a chloride ligand. One of the cation sites is disordered such that the aldehyde group is replaced by a 20 (1)% contribution from a carboxylic acid group (aldehyde H replaced by carboxyl O - H). Notable dimensions in the non-disordered complex cation are Ru - N 2.034 (2) Å and Ru - O 2.079 (2) Å to the pyCHO ligand and O - C 1.239 (4) Å for the pyCHO carbonyl group.