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Four new complexes 4) (2-HFBA: 2-fluorobenzoic acid; 4,4Ј-bpy: 4,4Ј-bipyridine; 2,2Ј-bpy: 2,2Ј-bipyridine; phen: 1,10-phenanthroline) have been synthesized and characterized by X-ray diffraction analysis. Complex 1 is a dimeric molecule with a one-dimensional supramolecular structure formed by hydrogen bonds. Complex 2 is an infinite one-dimensional polymer chain formed by bridging carboxylato groups; its 2D framework structure is formed by hydrogen bonds. The structure of complex 3 contains three independent binuclear molecules in the asymmetric unit. In two of them, two Tb 3+ ions are held together by four 2-FBA groups, with two of them in a bidentate-bridging mode and the other two in a chelating-bridging mode. In the third, two Tb 3+ ions are held together by four 2-FBA groups, all of which are in the bidentate-bridging mode. One 2-FBA group and one 2,2Ј-bpy chelate to one Tb 3+ ion, resulting in coordination numbers of the central ter-

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