Patent ID: 6875518

Claim:
A solution composition comprising: at least one ruthenium complex selected from the group consisting of a ruthenium complex represented by the following formula (1): Ru(COT′)(COD′) (1) wherein COT′ is a ligand represented by the following formula (2): wherein R 1 and R 2 are each independently a hydrogen atom or alkyl group having 1 to 5 carbon atoms, and COD′ is a ligand represented by the following formula (3): wherein R 3 and R 4 are each independently a hydrogen atom or alkyl group having 1 to 5 carbon atoms, and a ruthenium complex having an acyloxy group represented by the following formula (4): R 5 COO— (4) wherein R 5 is a hydrogen atom, alkyl group having 1 to 18 carbon atoms or alkenyl group having 2 to 18 carbon atoms, or a biscarboxylato group represented by the following formula (5): —OOC—COO— (5), or at least one ruthenium group selected from the group consisting of: Ru[R 15 —CO—CR 16 —COOR 17 ] d [R 18 —CO—CR 19 —COOR 20 ] e [R 21 —CO—CR 22 —COOR 23 ] f ; (7): Ru[R 24 —OCO—CR 25 —COOR 26 ] g [R 27 —OCO—CR 28 —COOR 29 ] h [R 30 —OCO—CR 31 —COOR 32 ] j ; (8): Ru[R 6 —CO—CR 7 —COR 8 ] j [R 15 —CO—CR 16 —COOR 17 ] k ; (9): Ru[R 6 —CO—CR 7 —COR 8 ] l [R 24 —OCO—CR 25 —COOR 26 ] m ; (10): Ru[R 15 —CO—CR 16 —COOR 17 ] n [R 24 —OCO—CR 25 —COOR 26 ] o ; and (11): Ru[R 24 —OCO—CR 25 —COOR 26 ][R 6 —CO—CR 7 —COR 8 ][R 15 —CO—CR 16 —COOR 17 ]; (12): wherein d, e, f, g, h and i are each independently an integer of 0 to 3, j, k, l, m, n and o are each independently an integer of 1 or 2, R 6 , R 8 , R 9 , R 11 , R 12 , R 14 , R 15 , R 17 , R 18 , R 20 , R 21 , R 23 , R 24 , R 26 , R 27 , R 29 , R 30 and R 32 are each independently an alkyl group having 1 to 18 carbon atoms, alkenyl group having 2 to 18 carbon atoms or aryl group, and the alkyl group or alkenyl group may have a substituent such as a halogen group or alkoxy group, R 7 , R 16 , R 19 , R 22 , R 25 , R 28 and R 31 are each independently an alkyl group having 1 to 18 carbon atoms, alkenyl group having 2 to 18 carbon atoms, alkoxycarbonyl group having an alkyl group with 1 to 18 carbon atoms or alkenyl group, or aryl group having an alkyl group with 1 to 18 carbon atoms or alkenyl group as a substituent, and the alkyl group, the alkyl group in the alkenyl group and alkoxy group, or the alkenyl group may have a substituent such as a halogen group or alkoxy group, and with the proviso that d+e+f=3, g+h+i=3, j+k=3, l+m=3, and n+o=3.