A study of the coordination ability of 2,5-di(2-pyridyl)phospholes on Ru centres
摘要:
The coordination behaviour of the readily available 1-phenyl-2,5-di(2-pyridyl)phosphole (NPN) toward Ru centres was investigated. Neutral and ionic compounds of formula [RuCl(p-cymene)(NPN)]TfO (TfO = CF3SO3)... (1), [RuCl(p -cyme-ne)(NPN)]BF4 (2), [RuCl(C6Me6)(NPN)]TfO (3), RuCp'Cl(NPN) [CP' = C5H5 (4), C5Me5 (5)], Ru(C5Me5)(sigma(1)-C8H13)(NPN) (6), RUCl2(NPN)(2) (7) and RuCIH(cod)(NPN) (cod = 1,5-cyclooctadiene) (8) were obtained. Two diastereomers were obtained for 1, 2 and 4, (a, b) while three were found in the case of 8 (a-c). According to NMR spectroscopy, the 2,5-bis(2-pyridyl)phosphole acts as a 1,4-P,N chelate ligand in all cases. This behaviour was confirmed by an X-ray diffraction study performed on complex 1a. Proton transfer studies on complex 8 demonstrated the influence of the molecular structure on the ability to form dihydrogen bridges. (C) 2002 Elsevier Science B.V. All rights reserved.