NOVELTY - Metallic compound (I), comprising a sub structure of metal-ligand complex (II), is new.    USE - The metallic compound (I), oligomer, polymer and dendrimer are useful in an electronic device comprising organic electroluminescent device, organic integrated circuits, organic field-effect transistors, organic thin film transistors, organic light emitting transistors, organic solar cells, organic optical detectors, organic photoreceptors, organic field-quench devices, light-emitting electrochemical cells or organic laser diodes (all claimed).    ADVANTAGE - The metallic compound (I): exhibits a high energy, power efficiency, operating voltage, emission color and durability, thus is suitable in organic electroluminescent devices; and can be obtained in a simple manner with high yield.    DETAILED DESCRIPTION - Metallic compound of formula ((M(L)n(L1)m)wx+(Anion)yz-) (I), comprising a sub structure of metal-ligand complex of formula (II), is new.    M = metal;    Y1 = C or N, where double bond is present respectively between two atoms Y1 or between adjacent atoms Y1 and A, which are bound in Cy1, or between two atoms Y1 or between adjacent atoms Y1 and A, which are bound in Cy2; either    Cy1+A+2Y1 = six-membered ring or five-membered ring, where Cy1 is substituted by at least one R and Cy1 exhibits Z as a part of cycle;    Z = C(=O), C(=S), CR2, NR, O, S, PR or P(=O)R; or    Cy2+A+2Y1 = aryl or heteroaryl, where Cy2 is substituted by at least one R;    A = C or N;    X = CR or N; either    R = H, D, F, Cl, Br, I, N(R1)2, P(R1)2, CN, NO2, Si(R1)3, B(OR1)2, C(=O)R1, P(=O)(R1)2, S(=O)R1, S(=O)2R1, OSO2R1, OH, SH, O-, S-, N(R1)-, 1-40C alkyl, 1-40C alkoxy, 1-40C thioalkoxy, 2-40C alkenyl, 2-40C alkynyl, 3-40C alkyl (optionally cyclic), 3-40C alkenyl, 3-40C alkynyl, 3-40C alkoxy or 3-40C thioalkoxy (where (i) each R is substituted by at least one R1, (ii) at least one non-adjacent CH2 is replaced by R1C=CR1, CC, Si(R1)2, Ge(R1)2, Sn(R1)2, C=O, C=S, C=Se, C=NR1, P(=O)(R1), SO, SO2, NR1, O, S or CONR1, and (iii) at least one H is replaced by D, F, Cl, Br, I, CN or NO2), aromatic or heteroaromatic ring with 5-60 ring atoms (each group is substituted by at least one R1), aryloxy or heteroaryloxy with 5-60 ring atoms (substituted by at least one R1), diarylamino, diheteroarylamino or arylheteroarylamino with 10-40 ring atoms (substituted by at least one R1); or    2R = mono- or polycyclic, aliphatic, aromatic and/or benzo-fused ring, where at least two R are adjacent; either    R1 = H, D, 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, 1-40C alkyl, 1-40C alkoxy, 1-40C thioalkoxy, 2-40C alkenyl, 2-40C alkynyl, 3-40C alkyl (optionally cyclic), 3-40C alkenyl, 3-40C alkynyl, 3-40C alkoxy or 3-40C thioalkoxy (where (ia) each group is substituted by at least one R2, (iia) at least one non-adjacent CH2 is replaced by R2C=CR2, CC, 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 (iiia) at least one H is replaced by D, F, Cl, Br, I, CN or NO2), aromatic or heteroaromatic ring with 5-60 ring atoms (each group is substituted by at least one R2), aryloxy or heteroaryloxy with 5-60 ring atoms, which are substituted by at least one R2, diarylamino, diheteroarylamino or arylheteroarylamino with 10-40 ring atoms, which are substituted by at least one R2; or    2R1 = mono- or polycyclic, aliphatic or aromatic ring, where at least two R1 are adjacent;    R2 = H, D, F, 1-20C aliphatic, aromatic, heteroaromatic organic residue, preferably hydrocarbon, where at least one H is replaced by D or F; or    R2 = mono- or polycyclic, aliphatic or aromatic ring, where at least two R2 are adjacent;    L = ligand;    L1 = co-ligand, where many ligands L or LL1 are connected over any bridge V1 and forms tridentate, tetradentate, pentadentate or hexadentate ligand system;    V1 = bridging unit;    n = 1-3;    m = 0-4;    w = 1-3; and    x-z = 0-3, where (wx x) = (yx z).    Provided that: one Y1 in Cy1 is C and the other Y1 in Cy1 is N, when Cy1 is a six-membered ring; both Y1 in Cy1 is C or N, when Cy1 is a five membered ring; Cy1 is fused, when Cy1 is six-membered ring or five- or six-membered aryl or heteroaryl, which is substituted by at least one R; both Y1 in Cy2 are C, when Cy2 is six-membered aryl or heteroaryl; and at least one Z is C(=O), C(=S), CR2, or P(= O)R, when Cy1 is a five membered ring. INDEPENDENT CLAIMS are also included for:    (1) preparing (I);    (2) an oligomer, polymer or dendrimer comprising at least one (I); and    (3) an organic electroluminescent device comprising at least one emitting layer, preferably in combination with a matrix comprising ketones, phosphine oxides, sulfoxides, sulfones, triarylamines, carbazole derivatives, indolocarbazole derivative, indolocarbazole derivative, azacarbazole, bridged carbazole derivative, bipolar matrix materials, silanes, azaborole, boronic esters, triazine derivatives, zinc complexes, diaza- or tetraazasilole derivative and diazaphosphole derivative.