NOVELTY - A cyclopara(hetero)arylene compound (I) is new.    USE - Cyclopara(hetero)arylene compound is used for organic electroluminescent element, organic transistor, organic solar cell, carbon nanotube and electronic material.    ADVANTAGE - The cyclopara(hetero)arylene compound is manufactured at high yield at mild condition.    DETAILED DESCRIPTION - A cyclopara(hetero)arylene compound of formula (I) is new.    Ar1-Ar4=optionally substituted bivalent aromatic group or optionally substituted bivalent heteroaromatic group chosen from benzene, naphthalene, fluorene, indan, indene, azulene, anthracene, phenanthrene, phenalene, dihydroanthracene, indacene, tetracene, pyrene, pyridine, pyrazine, pyrimidine, pyridazine, indole, quinoline, isoquinoline, tetrahydroquinoline, tetrahydroisoquinoline, benzothiazole, benzoxazole, benzoisoxazole, thianthrene, benzimidazole, chromene, xanthene, phenoxathiin, isoindole, indolizine, cinnoline, carbazole, ( beta )carboline, phenanthridine, acridine, phenanthroline, phenothiazine, phenoxazine, phenanthridine, isochroman, chroman, phenazine, carbazole, indoline and isoindoline;and    n1-n4=1 or more.    When Ar1-Ar4 is 1,4-phenylene, n1+n2+n3+n4 are numbers other than 9, 12 and 18. #    INDEPENDENT CLAIMS are included for:    (i) manufacture of cyclopara(hetero)arylene compound;    (ii) metallic complex of formula (III); and    (iii) metallic complex of formula (IV).    M = platinum, palladium or nickel;    L = ligand coordinated with M;    Y1 = CR1 or N;    Y2 = CR2 or N;    Y3 = CR3 or N;    Y4 = CR4 or N;    R1-R4 = H, alkyl, cycloalkyl, alkoxy, alkenyl, alkynyl, halo, aryl, heterocyclyl, aralkyl, OH, CN, NO2, COOH, NH2, monoalkyl amino, dialkylamino, acylamino, acyl, alkyl carbonyloxy, aryl carbonyloxy, alkoxycarbonyl, alkoxy carbonylamino, fluoroalkyl, perfluoroalkyl, carbamoyl, mono- or di- substituted carbamoyl, sulfamoyl, mono- or di- substituted sulfamoyl or alkyl sulfonylamino;and    R1+R2 or R3+R4 = 5-6 membered cyclic group.