Reaction of MCl5(M = Nb or Ta) with p-butylcalix[4]arene, L-(OH)4, led, depending on the reaction conditions, either to mononuclear complexes [(AcO)–L–(O)3MCl2], or, in the case of niobium only, to the tetranuclear complex [{µ-L-(O)4}2Nb4O2Cl8], characterized by X-ray analysis.
F. Corazza, C. Floriani, A. Chiesi-Villa and C. Guastini, J. Chem. Soc., Chem. Commun., 1990, 1083 DOI: 10.1039/C39900001083
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