An uncharged compound of the formula (1) M(L)n(L′)m(L″)o  Formula (1) containing a substructure M(L)n of the formula (3) or (4) M is a transition metal; E is identical or different on each occurrence and is in each case a sp2-hybridized carbon or nitrogen atom; Z is identical or different on each occurrence and is in each case C(R)2 or NR; Cy1 and Cy2 are identical or different on each occurrence and are in each case a substituted or unsubstituted heterocycle which coordinates to M via the N atom and may have a bond to the group Z. The compound can also be used in an oligomer, polymer, dendrimer or an electronic component.