NOVELTY - Electronic device comprises at least one metal complex (I).    USE - The electronic device is useful as organic electroluminescent device (organic light-emitting diodes, polymer light emitting diode) (preferred), organic integrated circuit, organic field-effect transistor, organic thin-film transistor, organic light-emitting transistor, organic solar cell, organic optical detector, organic photoreceptor, organic field-quench device, light-emitting electrochemical cell and organic laser diode. The metal complex (I) is useful as emission material in an emitting layer (all claimed).    ADVANTAGE - The phosphorescent metal complex (I) has very long luminescence lifetime compared to other fluorescent compounds. The isonitrile ligand present in the organic electroluminescent device shows high operation durability and efficiency at high brightness.    DETAILED DESCRIPTION - Electronic device comprises at least one metal complex of formula ((L)y-xM(-C?=N-R-)x) (I).    M = transition metal;    L = mono-, bi-, tri- or tetra dentate ligand that binds to the metal M and is optionally substituted by at least one R1, and at the same time the ligand L may also be bonded to the isonitrile group of R; either    R = 1-60C organic substituent (optionally substituted by at least one R1); or    many R linked together = form a multidentate ligand, where R can also be linked with the ligand L; either    R1 = H, F, Cl, Br, I, N(R2)2, CN, NO2, Si(R2)3, B(OR2)2, C(=O)R2, P(=O)(R2)2, S(=O)R2, S(=O)2R2, OSO2R2, a straight-chain alkyl, alkoxy or thio-alkoxy having 1-40C or a branched or cyclic alkyl, alkoxy or thio-alkoxy having 3-40C (all optionally substituted with at least one R2), where one or more nonadjacent CH2 groups are replaced by R2C=CR2, C?=C, Si(R2)2, Ge(R2)2, Sn(R2)2, C=O, C=S, C=Se, C=NR2, P(=O)(R2), SO, SO2, NR2, O, S or CONR2, and one or more H atoms are replaced by F, Cl, Br, I, CN or NO2, or an aromatic or heteroaromatic ring system having 5-60 aromatic ring atoms (optionally substituted by at least one R2), or an aryloxy or heteroaryloxy having 5-60 aromatic ring atoms (optionally substituted by at least one R2) and/or a diarylamino, diheteroarylamino or arylheteroarylamino having 10-40 aromatic ring atoms (optionally substituted by at least one R2); or    two or more R1 together = form a mono- or polycyclic aliphatic, aromatic and/or benzoannellated ring system; either    R2 = H, F or an aliphatic, aromatic and/or hetero aromatic hydrocarbon having 1-20C, in which one or more H atoms may be replaced by F; or    two or more R2 together = form mono- or polycyclic aliphatic or aromatic ring system;    x = 3-6; and    y = 5 or 6, with the proviso that y is greater than or equal to x.    INDEPENDENT CLAIMS are included for:    (1) producing the electronic device, comprising coating at least one layer with a sublimation procedure and/or coating at least one layer with organic vapor phase deposition procedure or with a carrier gas sublimation or with organic vapor jet printing procedure and/or producing at least one layer from solution or with a printing process;    (2) the metal complex (I), where the at least one of the isonitrile ligand is 1,3,5-tris(2-isocyanophenyl)benzene and 1,3,5-tris(2-isocyanophenyl)cyclohexane, respectively substituted by at least one R1; and    (3) 1,3,5-tris(2-isocyanophenyl)benzene compound and 1,3,5-tris(2-isocyanophenyl)cyclohexane compound, both substituted by at least one R1.