title: CO releasing properties and cytoprotective effect of cis-trans-[Re(II)(CO)2Br2L2]n complexes.
abstract: The carbon monoxide (CO) releasing properties of a series of rhenium(II)-based complexes of general formula cis-trans-[Re(II)(CO)(2)Br(2)L(2)](n) and cis-trans-[Re(II)(CO)(2)Br(2)N[intersection]N] (where L = monodentate and N[intersection]N = bidentate ligand) are reported. Complexes evaluated in this study were obtained from direct ligand substitution reactions of the cis-[Re(II)(CO)(2)Br(4)](2-) synthon (2) recently described. (1) All molecules have been fully characterized. The solid-state structures of the cis-trans-[Re(II)(CO)(2)Br(2)L(2)] (with L = N-methylimidazole (3), benzimidazole (4) and 4-picoline (5)) and the cis-trans-[Re(II)(CO)(2)Br(2)N[intersection]N] (with N[intersection]N = 4,4'-dimethyl-2,2'-bipyridine (8) and 2,2'-dipyridylamine (11)) adducts are presented. The release of CO from the cis-trans-[Re(II)(CO)(2)Br(2)L(2)](n) complexes was assessed spectrophotometrically by measuring the conversion of deoxymyoglobin (Mb) to carbonmonoxy myoglobin (MbCO). Only compounds bearing monodentate ligands were found to liberate CO. The rate of CO release was found to be pH dependent with half-lives (t(1/2)) under physiological conditions (25 degrees C, 0.1 M phosphate buffer, and pH 7.4) varying from ca. 6-43 min. At lower pH values, the time required to fully saturate Mb with CO liberated from the metal complexes gradually decreased. Complex 2 and the cis-trans-[Re(II)(CO)(2)Br(2)(Im)(2)] adduct (with Im = imidazole (6)) show a protective action against "ischemia-reperfusion" stress of neonatal rat ventricular cardiomyocytes in culture.
authors.affiliation: Institute of Inorganic Chemistry, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland. fzobi@aci.uzh.ch
authors.forename: Fabio
authors.initials: F
authors.lastname: Zobi
authors.forename: Alois
authors.initials: A
authors.lastname: Degonda
authors.forename: Marcus C
authors.initials: MC
authors.lastname: Schaub
authors.forename: Anna Yu
authors.initials: AY
authors.lastname: Bogdanova
mesh_terms: D000818:Animals; D002248:Carbon Monoxide / Q000737:chemistry*; D019610:Cytoprotection / Q000187:drug effects*; D032383:Myocytes, Cardiac / Q000187:drug effects / Q000473:pathology; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D015427:Reperfusion Injury / Q000473:pathology / Q000517:prevention & control; D012211:Rhenium / Q000737:chemistry*; D013237:Stereoisomerism; D013312:Stress, Physiological / Q000187:drug effects
chemical_list: D009942:Organometallic Compounds; D012211:Rhenium; D002248:Carbon Monoxide