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Synthesis and Characterization of Ruthenium Complexes with Substituted Pyrazino[2,3‐ f ][1,10]‐phenanthroline (=Rppl; R=Me, COOH, COOMe)
Author(s) -
Delgadillo Alvaro,
Romo Paola,
Leiva Ana Maria,
Loeb Bárbara
Publication year - 2003
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.200390168
Subject(s) - chemistry , homoleptic , ruthenium , phenanthroline , quinoxaline , moiety , ligand (biochemistry) , stereochemistry , bipyridine , medicinal chemistry , metal , combinatorial chemistry , crystallography , organic chemistry , crystal structure , catalysis , receptor , biochemistry
A series of substituted pyrazino[2,3‐ f ][1,10]‐phenanthroline (Rppl) ligands (with R=Me, COOH, COOMe) were synthetized (see 1 – 4 in Scheme 1 ). The ligands can be visualized as formed by a bipyridine and a quinoxaline fragment (see A and B ). Homoleptic [Ru(R 1 ppl) 3 ](PF 6 ) 2 and heteropleptic [Ru(R 1 ppl){(R 2 ) 2 bpy} 2 ](PF 6 ) 2 (R 1 =H, Me, COOMe and R 2 =H, Me) metal complexes 5 – 7 and 8 – 13 , respectively, based on these ligands were also synthesized and characterized by conventional techniques ( Schemes 2 and 3 , resp.). In the heteroleptic complexes, the R 1 ‐ppl ligand reduces at a less‐negative potential than the bpy ligand, reflecting the acceptor property conferred by the quinoxaline moiety. The potentiality of some of these complexes as solar‐cell dyes is discussed.