NOVELTY - Adduct comprises a carbon nanotube and a transitional metal coordination complex, where the metal of the complex is attached by a covalent linkage to at least one oxygen moiety on the nanotube, and the transitional metal coordination complex is e.g. Wilkinson's complex, or silver diamine.    USE - The adduct is useful as catalyst systems, and in catalysis. The adduct is useful in a device, which is sensors. The device is useful in molecular electronics, solar cells, optoelectronics, in nanocatalysis, ors scanning probe microscopy tips.    ADVANTAGE - The adduct has high degree of solubility in organic or aqueous solvents. The method of exfoliating nanotube bundle is a simple chemical processes. The adduct exhibits strong intrinsic luminescence, when placed in an organic solvent.    DETAILED DESCRIPTION - Adduct comprises a carbon nanotube and a transitional metal coordination complex, where the metal of the complex is attached by a covalent linkage to at least one oxygen moiety on the nanotube, and the transitional metal coordination complex is Wilkinson's complex, silver diamine, cuprous complex of formula ((Cu(NH)4)2+), ferrocyanide ion, ferricyanide ion, cobalt(III)hexammine ion, diamminedichloroplatinum(II), chromium(III)(ethylenediamine) ion, tetraammine platinum (II) ion, bis(cyclopentadienyl)iron(II), bis(cyclopentadienyl)nickel, tetrachloropalladate(II) ion, chromium hexacarbonyl, hexamminenickel(II) ion, hexafluorocobaltate(III), platinum complex of formula ((Pt(ethylenediamine)2Cl2)Br2), cobalt complex of formula ((Co(NH3)4 (SCN)Br)Cl), hexaaquairon(III) ion, cerium(IV)hexachloride, lanthanum complex of formula ((La(acetylacetone)3 (H2O)2)), neodymium complex of formula ((Nd (H2O)9)3+), erbium complex of formula ((Er(NCS)6)), lutitium complex of formula (Lu(2,6-dimethylphenyl)4-), or holmium complex of formula ((Ho(tropolonate)4)-). INDEPENDENT CLAIMS are included for:    (1) a method of producing many carbon nanotubes with increased solubility, comprising adding a solution comprising the transitional metal coordination complex to the carbon nanotube dispersion to form a resultant dispersion comprising carbon nanotube metal adducts, where the many carbon nanotubes with increased solubility is formed;    (2) a method of exfoliating many carbon nanotube bundles, comprising contacting the carbon nanotube dispersion having many nanotube bundles, where the bundles have an average first diameter, with a solution comprising transitional metal coordination complexes, hence exfoliating the bundles, and the exfoliated bundles have an average second diameter;    (3) a method of providing single carbon nanotubes and carbon nanotube bundles with the selected diameter, comprising contacting the carbon nanotube dispersion with the solution comprising the transitional metal coordination complex, where adducts are formed between single nanotubes and the transitional metal complex, and between carbon nanotube bundles of the selected diameter and the transitional metal complex, and the selected diameter is less than 10 nanometers, and precipitating the adducts from the solution, where carbon nanotubes with a selected diameter are provided; and    (4) a method of modifying a physical property of the nanotube comprising contacting the carbon nanotube with the solution of the transitional metal coordination complex to form a carbon nanotube-transitional metal coordination complex adduct, where the physical property of the carbon nanotube is modified.