Complexes of new chiral terpyridyl ligands. Synthesis and characterizationof their ruthenium(II) and rhodium(III) complexes

Citation
M. Ziegler et al., Complexes of new chiral terpyridyl ligands. Synthesis and characterizationof their ruthenium(II) and rhodium(III) complexes, J CHEM S DA, (5), 1999, pp. 667-675
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
ISSN journal
0300-9246 → ACNP
Issue
5
Year of publication
1999
Pages
667 - 675
Database
ISI
SICI code
0300-9246(19990307):5<667:CONCTL>2.0.ZU;2-E
Abstract
Enantiomerically pure, chiral terpyridyl-type ligands L-1 ('dipineno'-[5,6: 5 ",6 "]-fused 2,2':6',2 "-terpyridine) and L-2 ('dipineno'-[4,5: 4'',5"]-f used 2,2':6',2 "-terpyridine) have been synthesized in high yields starting from 2,6-diacetylpyridine and enantiopure a-pinene. Complexes of L' and L- 2 with Rh-III and Ru-II have been prepared and studied spectroscopically. T he complexes [Ru(L),(2)][PF6](2) (L = L-1 or L-2) were obtained in high yie lds using microwave heating in ethylene glycol as solvent. The rhodium(III) and ruthenium(II) complexes of L-1 and L-2 have a helically distorted terp yridyl moiety, as shown by the considerable optical activity in the ligand centered and metal to ligand charge transfer transitions. Crystal structure s of [Rh(L-1)Cl-3] and [Ru(L-1)Cl-3] show a considerable out of plane disto rtion of the terpyridyl moiety, whereas free L-2 and [Ru(trpy)(L-2)][PF6](2 ) have a more planar arrangement of the pyridyl units.