TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The compounds (I) contain ligands L or are sixfold coordinated and contains two or three bidentate ligands L or two tridentate ligands L or are coordinated in a quadratic planar or tetradic manner and contains at least one bidentate ligands L or one tetradentate ligands. Preferred Definitions:    R3 = 24 heterocyclic and fused heterocyclic groups of formula e.g. (A)-(J);    X = CR1 or N; and    asterisk = position at which the groups coordinates to the metal.    SPECIFIC COMPOUNDS - Use of 356 compounds (I) is disclosed, e.g. 5,5',5''-tris(pyridin-2-yl)-2,2',2'',5,5',5'',8lambda5,8lambda5,8''lambda5-nonaaza- 6,6',6''-tribora-7-irida-7,7',7''-spiroter(tricyclo(6.4.0.02,6)dodecane) -1(12),1'(12'),1''(12''),8,8',8'',10,10',10''-nonaene-8,8',8''-tris(ylium) of formula (Ia), 5,5',5''-tris(pyrimidin-2-yl)-2,2',2'',5,5',5'',8lambda5,8'lambda5,8''lambda5, 12,12',12''-dodecaaza-6,6',6''-tribora-7-irida-7,7',7''-spiroter(tricyclo(6.4.0.02,6)dodecane)-1(12),1'(12'),1''(12''),8,8',8'',10,10',10''-nonaene-8,8',8''-tris(ylium), 5,5',5''-tris(pyridazin-3-yl)-2,2',2'',5,5',5'',8lambda5,8'lambda5,8''lambda5,9,9',9''-dodecaaza -6,6',6''-tribora-7-irida-7,7',7''-spiroter(tricyclo(6.4.0.02,6)dodecane)- 1(12),1'(12'),1''(12''),8,8',8'',10,10',10''-nonaene-8,8',8''-tris(ylium), 5,5',5''-tris(pyrimidin-4-yl)-2,2',2'',5,5',5'',8lambda5,8'lambda5,8''lambda5,10,10',10''- dodecaaza-6,6',6''-tribora-7-irida-7,7',7''-spiroter(tricyclo(6.4.0.02,6)dodecane)- 1(12),1'(12'),1''(12''),8,8',8'',10,10',10''-nonaene-8,8',8''-tris(ylium) and 5,5',5''-tris(pyrazin-2-yl)-2,2',2'',5,5',5'',8lambda5,8'lambda5,8''lambda5,11,11',11''-dodecaaza-6,6',6''-tribora-7-irida-7,7',7''-spiroter(tricyclo(6.4.0.02,6)dodecane)-1(12),1'(12'),1''(12''),8,8',8'',10,10',10''-nonaene-8,8',8''-tris(ylium).    EXAMPLE - A solution of 2-bromo-1,3-dipyridin-2-yl-1,3,2-diaza-borolidine (910.4 mg) and naphthaline (76.7 mg) in tetrahydrofuran (50 ml) was cooled to -45 degrees C. Then lithium powder (209.2 mg) was added to the solution. The mixture was stirred under cooling for 24 hours and then filtered under Celite (RTM: Diatomaceous earth). The filtrate was dropped to a solution of iridium-trispyridine trichloride in 25 mmol of tetrahydrofuran, cooled to -45 degrees C. Then the mixture was stirred for 5 hours at room temperature. The volatiles were removed in a rotary evaporator. The residues were suspended in 250 ml of hot heptane. After filtration over Celite (RTM: Diatomaceous earth), the volatiles were removed on a rotary evaporator and the residues were crystallized four times from toluene to obtain 5,5',5''-tris(pyridin-2-yl)-2,2',2'',5,5',5'',8lambda5,8lambda5,8''lambda5-nonaaza-6,6',6''-tribora-7-irida-7,7',7''-spiroter(tricyclo(6.4.0.02,6)dodecane) -1(12),1'(12'),1''(12''),8,8',8'',10,10',10''-nonaene-8,8',8''-tris(ylium) (Ia) (363.1 mg) with a yield of 42%.