Patent ID: 7169947

Claim:
A Compound of formula (I) in which copper is in the oxidation state +1, and L is R—C≡C—R′ having at least one silyl or ester group, R′HC═CHR having at least one silyl or ester group, R′ 3 Si—C≡C—R′, R′ 3 N, R′ 2 N(CH 2 ) n NR′ 2 , substituted or unsubstituted 2,2′-bipyridine, 1,10-phenanthroline, P(OR′) 3 , P(alkyl) 3 , R′—O—R′, R′—O(CH 2 ) n O—R′, R′—S—R′, R′—S(CH 2 ) n S—R′, CH 3 —C≡N, t Bu—C≡N, C 4 H 9 C≡N or Ph—C≡N, where R is A, aryl, alkylaryl or alkynyl having at least one SiR′ 3 or COOR′ group, and R′ is R, H, A, aryl, alkylaryl or alkynyl, where L, R and R′ may each, independently of one another, adopt identical or different meanings in different positions of the molecule, and A is straight-chain or branched C1–C30-alkyl, C3–C30-cycloalkyl, straight-chain or branched C2–C30-alkenyl or straight-chain or branched C3–C30-cycloalkenyl, aryl is C6–C10-aryl or alkylaryl, alkylaryl is C7–C18-alkylaryl, alkynyl is straight-chain or branched C2–C30-alkynyl.