title: Ruthenium(II) complexes containing 2-pyridineformamide- and 2-benzoylpyridine-derived thiosemicarbazones and PPh3: NMR and electrochemical studies of cis-trans-isomerization.
abstract: [RuCl(L)(PPh(3))(2)] complexes with 2-benzoylpyridine- and 2-pyridineformamide-derived thiosemicarbazones (HL) were obtained and fully characterized. The complexes form cis-trans isomers. The cis isomer is disfavored by the sterical effect of two bulky groups close to each other whereas the trans isomer is disfavored by the electronic effect of competition of two phosphorous for pi-bonding d orbitals of the metal. Our results suggest that, although both factors may be operating simultaneously, in CH(2)Cl(2) solution the balance of these counterpoising effects favors the formation of the trans isomer.
authors.affiliation: Departamento de Química, Universidade Federal de São Carlos, 1365-905 São Carlos, Brazil.
authors.forename: Angelica E
authors.initials: AE
authors.lastname: Graminha
authors.forename: Alzir A
authors.initials: AA
authors.lastname: Batista
authors.forename: Isolda C
authors.initials: IC
authors.lastname: Mendes
authors.forename: Letícia R
authors.initials: LR
authors.lastname: Teixeira
authors.forename: Heloisa
authors.initials: H
authors.lastname: Beraldo
mesh_terms: D004563:Electrochemistry / Q000379:methods*; D005559:Formamides / Q000737:chemistry*; D007536:Isomerism; D009682:Magnetic Resonance Spectroscopy; D009942:Organometallic Compounds / Q000737:chemistry*; D010720:Phosphines / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013882:Thiosemicarbazones / Q000737:chemistry*