J.L.J thanks the Spanish MEC for a Juan de la Cierva contract, and M.M. to CSIC for an I3P grant. Authors thank Dr. Alejandro Vidal-Moya and Estrella Mateos for NMR measurements. The authors thank the Spanish CICYT (MAT2003-07945- C02-01 and MAT2003-07769-C02-01) and Generalitat Valenciana (project GV04B-270) for financial support.
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