[V-III(H2O)](3)O(O2CC6H4CO2)(3)center dot(Cl, 9H(2)O) (MIL-59): a rare example of vanadocarboxylate with a magnetically frustrated three-dimensional hybrid framework

[V-III (H2O)](3)O(O2CC6H4CO2)(3).(Cl, 9H(2)O) (denoted MIL-59) presents a three-dimensional framework built up from octahedral vanadium trimers joined via the isophthalate anionic linkers to delimit cages where water molecules and chlorine anions are occluded; the frustrated magnetic behaviour of MIL-59 is discussed.