摘要氯η6-芳烃钌钌N∩O基配合物[(η6-芳烃)Ru(N∩O)Cl] [N∩O=吡嗪-2-羧酸(pca-H),8-羟基喹啉(hq-H); 芳烃= p-i PrC 6 H 4 Me,N = O = hq(1); 带有NaN 3的芳烃= C 6 Me 6,N = O = hq(2)]产生具有通式[(η6 -arene)Ru(N∩O)N 3] [N∩O = pca,芳烃= p-i PrC 6 H 4 Me(3),芳烃= C 6 Me 6(4); N = O = hq,芳烃= p-iPrC 6 H 4 Me(5),芳烃= C 6 Me 6(6)]。这些配合物与活化的炔烃二甲基和乙酰二羧酸二乙酯进行[3 + 2]偶极环加成反应,生成芳烃三唑配合物[(η6-芳烃)Ru(N∩O){N 3 C 2(CO 2 R)2}]。 [N = O = pca,R = Me,芳烃= p-i PrC 6 H 4 Me(7),C
Mono and dinuclear iridium, rhodium and ruthenium complexes containing chelating carboxylato pyrazine ligands: Synthesis, molecular structure and electrochemistry
摘要:
The mononuclear complexes [(eta(5)-C5Me5)IrCl(L-1)] (1), [(eta(5)-C5Me5)RhCl(L-1)] (2), [(eta(6)-p-Pr'C6H4Me)RuCl(L-1)] (3) and [(eta(6)- C6Me6)RuCl(L-1)] (4) have been synthesised from pyrazine-2-carboxylic acid (HL1) and the corresponding complexes [{(eta(5)- C5Me5)IrCl2)(2)], [{(eta(5)-C5Me5)RhCl2)(2)], [{(eta(6)-p-Pr'C6H4Me)RuCl2}(2)], and [{(eta(6)-C6Me6)RuCl2}(2)], respectively. The related dinuclear complexes [{(eta(5)-C5Me5)IrCl)(2)(mu-L-2)] (5), [{(eta(5)-C5Me5)RhCl}(2)(mu-L-2)] (6), [{(n(6)-p-(PrC6H4Me)-C-i)RuCl}(2)(mu-L-2)] (7) and [(eta(6)-C6Me6)R-uCl} (2)(mu-L-2)] (8) have been obtained in a similar manner from pyrazine-2,5-dicarboxylic acid (H2L2). Compounds isomeric to the latter series, [{(eta(5)-C5Me5)IrCl}(2)(mu-L-3)] (9), [{(eta(5)-C5Me5)RhCl}(2)(mu-L-3)] (10), [{(p-Pr'C6H4Me)RuCl}(2)(mu-L-3)] (11) and [{(eta(6)-C6Me6)RuCl}(2)(mu-L-3 )] (12), have been prepared by using pyrazine-2,3-dicarboxylic acid (H2L3) instead of H2L2. The molecular structures of 2 and 3, determined by X-ray diffraction analysis, 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 centres. The electrochemical behaviour of selected representatives has been studied by voltammetric techniques. (c) 2007 Elsevier B.V. All rights reserved.