Title of article :
Relationship between pKa of 8-quinolinol derivatives and a π-donor ability of the 8-quinolinolato oxygen in linear nitrosylruthenium(II) complexes
Author/Authors :
Tsuyoshi Suganuma، نويسنده , , Atsushi Tanada، نويسنده , , Hiroshi Tomizawa، نويسنده , , Mikio Tanaka، نويسنده , , Eiichi Miki، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2001
Pages :
9
From page :
22
To page :
30
Abstract :
The relationship between the pKa of 8-quinolinol derivatives {8-quinolinol (Hqn), 2-methyl- (H2-Meqn), 2,4-dimethyl- (H2,4-diMeqn), 5-chloro- (H5-Clqn) and 5,7-dichloro-8-quinolinols (H5,7-diClqn)} and a π-donor ability of the 8-quinolinolato oxygens has been investigated by the identification of the structures of the major products, [RuCl(QN)(QN′)NO] (HQN=8-quinolinol derivative; HQN′=different 8-quinolinol derivatives), obtained by the reaction of [RuCl3(QN or QN′)NO]− with HQN′ or HQN. The results obtained clearly showed that the oxygen of the 8-quinolinol derivative that has a higher pKa predominantly coordinates in the trans position to the NO ligand and is a better π-electron donor. The order of the π-electron donor ability for the oxygen of the 8-quinolinol derivatives is as follows: H2-Meqn≥H2,4-diMeqn>Hqn≥H5-Clqn>H5,7-diClqn, almost agreeing with the magnitude of the pKa values of the corresponding 8-quinolinols. The structures of cis-1 [RuCl(5,7-diClqn)2NO] and cis-1 [RuCl(5,7-diClqn)(2-Meqn)NO] were determined by X-ray diffraction.
Keywords :
Nitrosyl complexes , Ruthenium complexes , Quinolinol complexes , crystal structures
Journal title :
INORGANICA CHIMICA ACTA
Serial Year :
2001
Journal title :
INORGANICA CHIMICA ACTA
Record number :
1320891
Link To Document :
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