A dinuclear Pt-carbene complex of the general formula (la) wherein A, R 1, R 2, R 3, R 4, R 5, R 6, R 7, R 8, R 9 and R 10 have the following meaning: A is each independently N or C; R 1, R 2, R 3 is each independently hydrogen, a linear or branched alkyl radical having from 1 to 10 carbon atoms, optionally interrupted by at least one heteroatom, and optionally bearing at least one functional group, or a cycloalkyl radical having from 3 to 10 carbon atoms; R 4 is each independently a linear or branched alkyl radical having from 1 to 10 carbon atoms, optionally interrupted by at least one heteroatom, and optionally bearing at least one functional group, a cycloalkyl radical having from 3 to 10 carbon atoms, a substituted or unsubstituted aryl radical having from 6 to 18 carbon atoms, or a substituted or unsubstituted heteroaryl radical having a total of from 5 to 18 carbon atoms and/or heteroatoms; R 5, R 6 is each independently a free electron pair if A is N, or, if A is C, hydrogen, a linear or branched alkyl radical having from 1 to 10 carbon atoms, optionally interrupted by at least one heteroatom, and optionally bearing at least one functional group, a cycloalkyl radical having from 3 to 10 carbon atoms, a substituted or unsubstituted aryl radical having from 6 to 18 carbon atoms, or a substituted or unsubstituted heteroaryl radical having a total of from 5 to 18 carbon atoms and/or heteroatoms, or R 4 and R 5, or R 5 and R 6 together with N and A, or together with A and A, form a saturated, or unsaturated, or aromatic ring having a total of from 5 to 18 carbon atoms and/or heteroatoms, and optionally interrupted by at least one heteroatom; R 7, R 8, R 9, R 10 are each independently hydrogen, a linear or branched alkyl radical having from 1 to 10 carbon atoms, optionally interrupted by at least one heteroatom, and optionally bearing at least one functional group, a cycloalkyl radical having from 3 to 10 carbon atoms, a substituted or unsubstituted aryl radical having from 6 to 18 carbon atoms, a substituted or unsubstituted heteroaryl radical having a total of from 5 to 18 carbon atoms and/or heteroatoms, or a functional group selected from an ether group, an amino group, a thio group, an ester group, a carbonyl group, a nitro group, or a halogen group, or R 7 and R 8, or R 8 and R 9, or R 9 and R 10, together form a saturated, or unsaturated, or aromatic, optionally substituted ring having a total of from 5 to 18 carbon atoms and/or heteroatoms, optionally interrupted by at least one heteroatom; and/or R 6 and R 7 form a saturated or unsaturated, linear or branched bridge, optionally comprising heteroatoms, an aromatic unit, a heteroaromatic unit or functional groups, having a total of from 1 to 30 carbon atoms and/or heteroatoms, and optionally fused with a substituted or unsubstituted five- to eight-membered ring comprising carbon atoms and/or heteroatoms. A is each independently N or C; R 1, R 2, R 3 is each independently hydrogen, a linear or branched alkyl radical having from 1 to 10 carbon atoms, optionally interrupted by at least one heteroatom, and optionally bearing at least one functional group, or a cycloalkyl radical having from 3 to 10 carbon atoms; R 4 is each independently a linear or branched alkyl radical having from 1 to 10 carbon atoms, optionally interrupted by at least one heteroatom, and optionally bearing at least one functional group, a cycloalkyl radical having from 3 to 10 carbon atoms, a substituted or unsubstituted aryl radical having from 6 to 18 carbon atoms, or a substituted or unsubstituted heteroaryl radical having a total of from 5 to 18 carbon atoms and/or heteroatoms; R 5, R 6 is each independently a free electron pair if A is N, or, if A is C, hydrogen, a linear or branched alkyl radical having from 1 to 10 carbon atoms, optionally interrupted by at least one heteroatom, and optionally bearing at least one functional group, a cycloalkyl radical having from 3 to 10 carbon atoms, a substituted or unsubstituted aryl radical having from 6 to 18 carbon atoms, or a substituted or unsubstituted heteroaryl radical having a total of from 5 to 18 carbon atoms and/or heteroatoms, or R 4 and R 5, or R 5 and R 6 together with N and A, or together with A and A, form a saturated, or unsaturated, or aromatic ring having a total of from 5 to 18 carbon atoms and/or heteroatoms, and optionally interrupted by at least one heteroatom; R 7, R 8, R 9, R 10 are each independently hydrogen, a linear or branched alkyl radical having from 1 to 10 carbon atoms, optionally interrupted by at least one heteroatom, and optionally bearing at least one functional group, a cycloalkyl radical having from 3 to 10 carbon atoms, a substituted or unsubstituted aryl radical having from 6 to 18 carbon atoms, a substituted or unsubstituted heteroaryl radical having a total of from 5 to 18 carbon atoms and/or heteroatoms, or a functional group selected from an ether group, an amino group, a thio group, an ester group, a carbonyl group, a nitro group, or a halogen group, or R 7 and R 8, or R 8 and R 9, or R 9 and R 10, together form a saturated, or unsaturated, or aromatic, optionally substituted ring having a total of from 5 to 18 carbon atoms and/or heteroatoms, optionally interrupted by at least one heteroatom;