A ruthenium complex defined by Formula 1 in which: R 1 denotes a C 5 -C 24 perfluoroaryl; R 2, R 3, R 4 and R 5 independently of one another denote a hydrogen atom, a halogen atom, a C 1 -C 25 alkyl, a C 3 -C 7 cycloalkyl, a alkoxyl C 1 -C 25, aryloxyl C 5 -C 24, heteroaryloxyl C 5 -C 20, a C 5 -C 24 aryl, a C 5 -C 20 heteroaryl, a C 7 -C 24 aralkyl, a C 5 -C 24 perfluoroaryl, a 3-12 membered heterocycle, wherein the groups R 2, R 3, R 4 and R 5 may be mutually connected into a ring; A denotes a -CH 2 -, -O- or -OCH 2 - group; R 6 and R 7 independently of one another denote a hydrogen atom, a halogen atom, a C 1 -C 25 alkyl, a C 1 -C 25 perfluoroalkyl, a C 2 -C 25 alkene, a C 3 -C 7 cycloalkyl, a C 2 -C 25 alkenyl, cycloalkenyl C 3 -C 25, alkynyl C 2 -C 25, cycloalkynyl C 3 -C 25, a alkoxyl C 1 -C 25, aryloxyl C 5 -C 24, heteroaryloxyl C 5 -C 20, a C 5 -C 24 aryl, a C 5 -C 20 heteroaryl, a C 7 -C 24 aralkyl, a C 5 -C 24 perfluoroaryl, or a 3-12 membered heterocycle wherein the alkyl groups may be mutually connected into a ring, wherein R 6 and R 7 preferably denote a hydrogen, aryl substituted with a nitro (-NO 2), cyanide (-CN), carboxyl (-COOH), ester (-COOR'), amide (-CONR' 2), sulfonyl (-SO 2 R'), formyl (-CHO), sulfonamide (-SO 2 NR' 2) or ketone (-COR') group, in which R' has the following meaning: a C 1 -C 5 alkyl, a C 1 -C 5 perfluoroalkyl, a C 5 -C 24 aryl, a C 7 -C 24 aralkyl, a C 5 -C 24 perfluoroaryl; L 1 denotes a neutral ligand selected from groups encompassing pyridine or substituted pyridine, P(R') 3, P(OR') 3, O(R') 2, N 3, where each R' independently denotes a C 1 -C 12 alkyl, a C 3 -C 12 cycloalkyl, a C 5 -C 20 aryl, a C 7 -C 24 aralkyl, a C 5 -C 24 perfluoroaryl, or a 5-12 membered heteroaryl; X 1 and X 2 denote an anionic ligand independently selected from groups encompassing halide anions, the groups -CN, -SCN, -OR', -SR', -O(C=O)R', -O(SO 2)R', and -OSi(R') 3, where R' denotes a C 1 -C 12 alkyl, a C 3 -C 12 cycloalkyl, a C 2 -C 12 alkenyl, or a C 5 -C 20 aryl, which may possibly be substituted with at least one C 1 -C 12 alkyl, a C 1 -C 12 perfluoroalkyl, a C 1 -C 12 alkoxyl. a C 5 -C 24 aryloxyl, a C 5 -C 20 heteroaryloxyl or a halogen atom, wherein the term "perfluoroalkyl" denotes an alkyl group wherein all hydrogen atoms have been substituted by identical or different halide atoms, and the term "perfluoroaryl" denotes an aryl group in which all hydrogen atoms have been substituted by identical or different halogen atoms. R 1 denotes a C 5 -C 24 perfluoroaryl; R 2, R 3, R 4 and R 5 independently of one another denote a hydrogen atom, a halogen atom, a C 1 -C 25 alkyl, a C 3 -C 7 cycloalkyl, a alkoxyl C 1 -C 25, aryloxyl C 5 -C 24, heteroaryloxyl C 5 -C 20, a C 5 -C 24 aryl, a C 5 -C 20 heteroaryl, a C 7 -C 24 aralkyl, a C 5 -C 24 perfluoroaryl, a 3-12 membered heterocycle, wherein the groups R 2, R 3, R 4 and R 5 may be mutually connected into a ring; A denotes a -CH 2 -, -O- or -OCH 2 - group; R 6 and R 7 independently of one another denote a hydrogen atom, a halogen atom, a C 1 -C 25 alkyl, a C 1 -C 25 perfluoroalkyl, a C 2 -C 25 alkene, a C 3 -C 7 cycloalkyl, a C 2 -C 25 alkenyl, cycloalkenyl C 3 -C 25, alkynyl C 2 -C 25, cycloalkynyl C 3 -C 25, a alkoxyl C 1 -C 25, aryloxyl C 5 -C 24, heteroaryloxyl C 5 -C 20, a C 5 -C 24 aryl, a C 5 -C 20 heteroaryl, a C 7 -C 24 aralkyl, a C 5 -C 24 perfluoroaryl, or a 3-12 membered heterocycle wherein the alkyl groups may be mutually connected into a ring, wherein R 6 and R 7 preferably denote a hydrogen, aryl substituted with a nitro (-NO 2), cyanide (-CN), carboxyl (-COOH), ester (-COOR'), amide (-CONR' 2), sulfonyl (-SO 2 R'), formyl (-CHO), sulfonamide (-SO 2 NR' 2) or ketone (-COR') group, in which R' has the following meaning: a C 1 -C 5 alkyl, a C 1 -C 5 perfluoroalkyl, a C 5 -C 24 aryl, a C 7 -C 24 aralkyl, a C 5 -C 24 perfluoroaryl; L 1 denotes a neutral ligand selected from groups encompassing pyridine or substituted pyridine, P(R') 3, P(OR') 3, O(R') 2, N 3, where each R' independently denotes a C 1 -C 12 alkyl, a C 3 -C 12 cycloalkyl, a C 5 -C 20 aryl, a C 7 -C 24 aralkyl, a C 5 -C 24 perfluoroaryl, or a 5-12 membered heteroaryl; X 1 and X 2 denote an anionic ligand independently selected from groups encompassing halide anions, the groups -CN, -SCN, -OR', -SR', -O(C=O)R', -O(SO 2)R', and -OSi(R') 3, where R' denotes a C 1 -C 12 alkyl, a C 3 -C 12 cycloalkyl, a C 2 -C 12 alkenyl, or a C 5 -C 20 aryl, which may possibly be substituted with at least one C 1 -C 12 alkyl, a C 1 -C 12 perfluoroalkyl, a C 1 -C 12 alkoxyl. a C 5 -C 24 aryloxyl, a C 5 -C 20 heteroaryloxyl or a halogen atom,