Patent ID: 7538217

Claim:
A ruthenium complex, represented by the following formula (I): RuLL′X 2 (I) wherein X is —NCS, —SCN, —SeCN, —CN or —Cl; L is L′ is wherein Y is —O—, —S—, —SO 2 —, —CF 2 —, —CCl 2 — or —C(R 1 ) 2 —, wherein R 1 is aliphatic group or aromatic group, Q 1 and Q 2 each independently is halogen, H, —CN, —SCN, —NCS or —SF 5 , B is H or —(Z—A) m —R 2 , wherein Z is a single bond, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —CF 2 CH 2 —, —CH 2 CF 2 —, —CHF—CHF—, —C(O)O—, —OC(O)—, —CH 2 O—, —OCH 2 —, —CF═CH—, —CH═CF—, —CF═CF—, —CH═CH— or —C≡C—, A is substituted or unsubstituted 1,4-phenylene, wherein one or two of ═CH— can be substituted by ═N—, R 2 is H or organic group having 1 to 15 carbon atoms, m is 0, 1 or 2.