Ruthenium carbonyl complexes. III. Peparations, properties and structures of Dicarbonyl- and Monocarbonyl-(2,2':6',2''-terpyridyl)ruthenium(II) complexes

Abstract

Reaction of 2,2':6',2''-terpyridyl (tpy) with ruthenium dicarbonyl dihalides yields the complexes Ru(CO)2X2(tpy) (X = Br or Cl), which can be protonated giving [Ru(CO)2X2(tpyH)]ClO4. Crystal structures of the two forms (red and yellow) of Ru(CO)2Br2(tpy) show each to have octahedral stereo-chemistry with cis-carbonyls, trans-bromines, and bidentate tpy. Treatment of Ru(CO)2X2(tpy) complexes with trimethylamine N-oxide in dichloromethane at room temperature gives cis-Ru(CO)X2(tpy) complexes. The presence of cis halogens and tridentate terpyridyl in the chloro complex has been established by X-ray crystallography. Reaction of terpyridyl with ruthenium trichloride in dimethylformamide yields trans-Ru(CO)Cl2(tpy), the crystal structure of which has been determined.

Ruthenium Carbonyl Complexes of N-Heterocyclic Molecules. Part 2. Preparation, Protonation and Decarbonylation Reactions of Complexes with a Bidentate Terpyridyl Ligand. Structure of [Ru(CO)2(phen)(tpyH)](BF4)3

“…(3) (5) 0.5538 (6) 0.5803 (6) 0.5861 (5) 0.5626 (5) 0.5657 (5) 0.5724 (5) 0.5750 (6) 0.5766 (6) 0.5710 (5) 0.5616(4) 0.5868 (6) 0.5198 (5) 0.5312 (7) 0.6059 (8) 0.6739 (6) 0.6622 (6) 0.4443(4) 0.4867 (5) 0.4293 (6) (5) 0.61832(4) 0.7000(4) 0.6567(6) 0.7 I50 (6) 0.8237 (7) 0.8722 (6) 0.807 I(5) 0.8484 (6) 0.9608 (6) 0.9945 (6) 0.91 58 (6) 0.8077 (6) 0.7725(4) 0.7221 (6) 0.7268 (6) 0.6607 (8) 0.5887 (8) 0.5812 (7) 0.6515 (6) 0.4879(4) 0.3960 (6) 0.3135 (6) 0.3251 (6) 0.4202 (6) 0.5002 (5) 0.4387 (7) 0.5340 (7) 0.6173 (6) 0.7152 (6) 0.7895 (6) 0.7685 (6) 0.6748(4) 0.6009 (6) 0.5017(4) 0.5476 (6) 0.5 163(4) 0.5557 (6) 0.8057 (8) 0.7663 (7) 0.7346 (6) 0.3334 (6) 0.897 l ( 7 ) 0.4266(9) 0.5 I2 l(5) 0.5483(6) 0.68 12 (6) 0.4427 …”

Mixed ligand copper(II) complexes of phenanthroline/bipyridyl and curcumin diketimines as DNA intercalators and their electrochemical behavior under Nafion® and clay modified electrodes

“…b-Diketones are long known to form complexes with almost every metal and metalloid. Knoevenagel condensate of curcumin has a non-enolizable diketone moiety, which can effectively react with amines to form Schiff bases [13]. The naturally occurring coloring pigment, curcumin derived from Curcuma longa has a highly conjugated b-diketone moiety, is well known for its antioxidant activity and used as a food additive by Asians for many centuries [14].…”

Metal‐Free Carbonylations by Photoredox Catalysis

“…[12] However, the good coordinating ability of CO ligands and the existence of numerous stable carbonyl complexes of Ru (and other metals) discourage the use of such organometallic catalysts for the proposed aromatic carbonylation process. [13] Organic dyes, for example, the cheap fluoresceins, display similar photocatalytic activity in some reactions [14] and seemed more appropriate as no interference by the presence of carbon monoxide is known. [15] Furthermore, CO only exhibits absorptions in the vacuum-UV range below 180 nm.…”