Grafting of thiophenecarboxylates into magnetic transition metal hydroxide layers

New hybrid organic/inorganic systems have been elaborated by insertion/grafting of thiophenecarboxylates into the layered transition metal hydroxides Cu-2(OH)(3)(CH3CO2)center dot H2O and Co-2(OH)(3)NO3. The Cu-2(OH)(3.28)(TA)(0.72)center dot 0.08H(2)O (1; TA(-): 3-thiopheneacetate), Cu-2(OH)(3.04)(TDC)(0.48),1.84H(2)O (3; TDC2-: 2,5- thiophenedicarboxylate), Co-2(OH)(3.38)(TA)(0.62)center dot 1.52H(2)O (4), and Co-2(OH)(3.44)(TC)(0.56)center dot 0.7H(2)O (5;TC-: 2-thiophenecarboxylate) compounds have been synthesized by anionic exchange in alkaline media. Organic molecules interleaved between the layered inorganic framework are organized in a bilayer for the thiophenemonocarboxylates in Cu(II) and Co(II) materials and in a monolayer for the Cu( II) compound with the thiophenedicarboxylate. The insertion of the organic molecules into layered transition metal hydroxides modifies the magnetic properties of the inorganic layers, and ferromagnetic materials are obtained with Curie temperatures T-C up to 58 K and strong coercive fields up to 0.65 T.