Mono and dinuclear iridium, rhodium and ruthenium complexes containing chelating carboxylato pyrazine ligands: Synthesis, molecular structure and electrochemistry
Author(s)
Govindaswamy, Padavattan
Stepnicka, Petr
Ludvik, Jiri
Date issued
2007
In
J. Organomet. Chem.
Vol
8
No
692
From page
1661
To page
1671
Subjects
iridium rhodium ruthenium pyrazine carboxylato complex prepn structure electrochem crystal structure rhodium cyclopentadienyl pyrazinecarboxylato mononuclear dinuclear complex mol structure rhodium cyclopentadienyl pyrazinecarboxylato mononuclear dinuclear complex
Abstract
Mononuclear complexes [(?5-C5Me5)IrCl(L1)] (1), [(?5-C5Me5)RhCl(L1)] (2), [(?6-p-PriC6H4Me)RuCl(L1)] (3) and [(?6-C6Me6)RuCl(L1)] (4) have been synthesized from pyrazine-2-carboxylic acid (HL1) and the corresponding complexes [{(?5-C5Me5)IrCl2}2], [{(?5-C5Me5)RhCl2}2], [{(?6-p-PriC6H4Me)RuCl2}2], and [{(?6-C6Me6)RuCl2}2], resp. Related dinuclear complexes [{(?5-C5Me5)IrCl}2(?-L2)] (5), [{(?5-C5Me5)RhCl}2(?-L2)] (6), [{(?6-p-PriC6H4Me)RuCl}2(?-L2)] (7) and [{(?6-C6Me6)RuCl}2(?-L2)] (8) have been obtained in a similar manner from pyrazine-2,5-dicarboxylic acid (H2L2). Compds. isomeric to the latter series, [{(?5-C5Me5)IrCl}2(?-L3)] (9), [{(?5-C5Me5)RhCl}2(?-L3)] (10), [{(p-PriC6H4Me)RuCl}2(?-L3)] (11) and [{(?6-C6Me6)RuCl}2(?-L3)] (12), have been prepd. by using pyrazine-2,3-dicarboxylic acid (H2L3) instead of H2L2. The mol. structures of 2 and 3, detd. by x-ray diffraction anal., show the pyrazine-2-carboxylato moiety to act as an N,O-chelating ligand, while the structure analyses of 5-7, confirm that the pyrazine-2,5-dicarboxylato unit bridges two metal centers. The electrochem. behavior of selected representatives has been studied by voltammetric techniques. [on SciFinder(R)]
Publication type
journal article