TECHNOLOGY FOCUS - ELECTRONICS - Preferred Element: An element consists of a layer such as an electric charge carrying layer or electric charge prevention layer containing the pyrrolo quinoxaline-containing metal complex, provided between an anode and a cathode.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation is given.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: A liquid composition contains pyrrolo quinoxaline-containing metal complex, and a charge-transporting material. The charge-transporting material is a low molecular weight compound, and/or a polymer or an oligomer. The polymer/oligomer is conjugated-type polymer/oligomer containing a phenylene group and/or dibenzo group-containing partial structure of formula (2), and having halogen-containing repeating unit of formula (3), arylene group-containing repeating unit of formula: -Ar1- (4) and a bivalent heterocyclic group-containing repeating unit of formula (5).X1=-O-, -S-, -Se-, -BR21-, -SiR21R22-, -PR21-, -P(=O)R21-, -CR21R22-, -CR21R22-CR23R24-, -O-CR21R22-, -S-CR21R22-, -NR23-CR21R22-, -SiR21R22-CR23R24-,-SiR21R22-SiR23R24-, -CR21=CR22-, -NR21-, -N=CR21-, or -SiR21=CR22-;Ra,Rb,Rc,Rd=halogen, alkyl, alkoxy or aryl;m,n=0-4;X2=-O-, -S-, -Se-, -BR31-, -SiR31R32-, -PR31-, -P(=O)R31-, -CR31R32-, -CR31R32-CR33R34-, -O-CR31R32-, -S-CR31R32-, -NR33-CR31R32-, -SiR31R32-CR33R34-, -SiR31R32-SiR33R34-, -CR31=CR32-, -NR31-, -N=CR31-, or -SiR31=CR32-;R21-R24,R31-R34=alkyl, alkoxy, alkylthio, alkenyl, alkynyl, aryl, aryloxy, arylthio, arylalkyl, arylalkoxy, arylalkylthio, arylalkenyl, arylalkynyl, monovalent heterocyclic group, H, or halogen;Ar1-Ar5=arylene or bivalent heterocyclic group;Ar6-Ar8=aryl or monovalent heterocyclic group;s,t=0 or 1;p,q=0-3;ands+t=0-1.Preferred Property: The liquid composition has viscosity of 0.5-500 mPa.second at 25 degrees C. SPECIFIC COMPOUNDS - 5 Pyrrolo quinoxaline-containing metal complexes such as tetrakis(7-(3-(3,5-bis(4-tert-butylphenyl)phenyl)phenyl)-2,8-diazatricyclo (7.4.0.02,6)trideca-1(13),3,5,7,9,11-hexaene)diiridium dichloride of formula (I), bis(7-(3-(3,5-bis(4-tert-butylphenyl)phenyl)phenyl)-2,8-diazatricyclo(7.4.0.02,6)trideca-1(13),3,5,7,9,11-hexaene)iridium, tetrakis(7-(3-(3-fluorophenyl)phenyl)-11-methyl-2,8-diazatricyclo(7.4.0.02,6)trideca-1(13),3,5,7,9,11-hexaene)diiridium dichloride, tris(7-(3-(3-fluorophenyl)phenyl)-11-methyl-2,8-diazatricyclo(7.4.0.02,6)trideca-1(13),3,5,7,9,11-hexaene)iridium and tris(1-(4-tert-butylphenyl)isoquinoline)iridium, are disclosed.    EXAMPLE - 4-(3-Bromo-phenyl)-pyrrolo(1,2-a)quinoxaline (in g) (7.44), 3,5-di(4-tert-butylphenyl)phenyl pinacol borate (11.85), sodium carbonate (4.88), N,N-dimethylformamide (100 ml), ethanol (25 ml) and tetrakis(triphenyl phosphine)palladium(0) (1.06) were stir-mixed in a reactor for 11 hours. The reaction mixture was extracted with water (400 ml) and ethyl acetate/hexane mixed solvent (400 ml), and the obtained organic layer was washed with water (400 ml), 5 mass% sodium carbonate aqueous solution (200 ml) and saturated salt solution (200 ml), and dried using sodium sulfate. The obtained residue was purified using silica gel chromatography, to obtain 7-(3-(3,5-bis(4-tert-butylphenyl)phenyl)phenyl)-2,8-diazatricyclo(7.4.0.02,6)trideca-1(13),3,5,7,9,11-hexaene. The obtained 7-(3-(3,5-bis(4-tert-butylphenyl)phenyl)phenyl)-2,8-diazatricyclo(7.4.0.02,6)trideca-1(13),3,5,7,9,11-hexaene (1.17), iridium-chloride trihydrate (319 mg), 2-ethoxyethanol (7.5 ml) and water (2.5 ml) were heated at 140 degrees C for 9 hours in a reactor, under nitrogen stream. The reaction mixture was cooled, filtered, and washed with water, methanol and hexane, to obtain tetrakis(7-(3-(3,5-bis(4-tert-butylphenyl)phenyl)phenyl)-2,8-diazatricyclo(7.4.0.02,6)trideca-1(13),3,5,7,9,11-hexaene)diiridium dichloride (1.22).