TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): A donor group, group chosen from dipolarophile, 1,3-dipole, dienophile and diene, and optionally substituted 5- or 6-membered ring are subjected to Click cycloaddition reaction, to obtain triazole derivative (I). Preferred Compounds: Triazole derivative (I) is preferably chosen from compounds of formulae (II)-(XI).F'=group chosen from 23 groups e.g. groups of formulae (i)-(v);R,R1,R'=H, D, fluoro, chloro, bromo, iodo, N(R2)2, cyano, CF3, nitro, hydroxy, -COOH, COOR2, CO(NR2)2, Si(R2)3, B(OR2)2, C(=O)R2, P(=O)(R2)2, S(=O)R2, S(=O)2R2, OSO2R2, alkoxy, 3-40C thioalkoxy, linear 1-40C alkenyl, alkynyl or linear, branched or cyclic 2-40C alkyl, in which one or more nonadjacent CH2 groups are optionally substituted R2C=CR2, C=C, 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 H is optionally substituted by D, fluoro, chloro, bromo, iodo, cyano, CF3 or nitro;R2=5-60C aryloxy, heteroaryloxy, diarylamino, diheteroarylamino or 10-40C arylheteroarylamino;Ar',Ar1=optionally substituted 5-60C aryl or heteroaryl, in which Ar' and Ar1 are coupled by single bond or organic bridge;X,X1,X2=CR or N;Y',Y1,Y2=single bond, or O, S, NR, CRR', C=CRR' or C=NR;andZ1-Z3=CRR', CR, NR, N or O. SPECIFIC COMPOUNDS - 15 Triazole derivatives e.g. 9-(4-(4-phenyl-1H-1,2,3-triazol-1-yl)phenyl)-9H-carbazole of formula (IA), 2-(1-(4-(9H-carbazol-9-yl)phenyl)-1H-1,2,3-triazol-4-yl)propan-2-ol, methyl-1-(4-(9H-carbazol-9-yl)phenyl)-9-fluoro-4,5,6,7,8,9-hexahydro-1H-cycloocta(d)(1,2,3)triazol-9-carboxylate, 1-(4-(9H-carbazol-9-yl)phenyl)-4,5,6,7,8,9-hexahydro-1H-cycloocta(d)(1,2,3)triazol-9-ol and 1-(4-(9H-carbazol-9-yl)phenyl)-4,5,6,7,8,9-hexahydro-1H-cycloocta(d)(1,2,3)triazol-4-ol, are disclosed.    EXAMPLE - 142 mg Azidocarbazole, 51 mg phenylacetylene, 143 mg copper iodide in 4.35 mL N,N-diisopropylethylamine, and 6 mL dry tetrahydrofuran were stirred at room temperature for 48 hours. The solvent was removed and the crude product was purified using silica-gel column chromatography, to obtain 9-(4-(4-phenyl-1H-1,2,3-triazol-1-yl)phenyl)-9H-carbazole with yield or 92%.