Metallic compound and organic electroluminescence device comprising the same

1. A metallic compound represented by the following Chemical Formula 1:

wherein M is selected from Ir, Pt, Rh, Re, and Os, m is 2 or 3, n is 0 or 1, the sum of m and n is 3, provided that the sum of m and n is 2 when M is Pt,

X is N or P, Y is S, O, or Se,

Z is SiR 5 R 6 , CR 5 R 6 , PR 5 , S, SO 2 , carbonyl, or NR 5 ,

of the Chemical Formula 1 is represented by any one of the following Chemical Formulae 2:

wherein, in the above Chemical Formulae 2, Q is O, S, or Se, and * denotes a portion that is covalently bound with Z, and the transition metal M forms a complex compound while bound with a portion denoted as “a” in the above Chemical Formulae 2 by a covalent bond and bound with X of the Chemical Formula 1 by a coordination bond,

in the above Chemical Formulae 1 and 2, R 1 , R 2 , R 3 , and R 5 -R 16 are hydrogen, a C1 to C20 alkyl, an aryl, a cycloalkyl, a halogen, the alkyl having at least one halogen or at least one heteroatom substituent, carbonyl, vinyl, acetylenyl,

R 4 is hydrogen, a C1 to C20 alkyl, a cycloalkyl, a halogen, the alkyl having at least one halogen or at least one heteroatom substituent, and

in the above Chemical Formula 1, L 2 is represented by the following Chemical Formulae 2, 3, and 4:

wherein, in the above Chemical Formula 1, the transition metal M forms a complex compound by a covalent bond with a portion denoted as * in the above Chemical Formulae 2, and a coordination bond with an adjacent N or P atom,

Z and W in the above Chemical Formulae 3 and 4 are the same or different and heteroatoms O, N, S, or P, and

R 17 -R 30 in the Chemical Formulae 2, 3, and 4 are selected from hydrogen, a C1 to C20 alkyl, an aryl, a cycloalkyl, halogen, the alkyl having at least one halogen or at least one heteroatom substituent, carbonyl, vinyl, and acetylenyl.

2. An organic electroluminescence device comprising the metallic compound of claim 1 .