Synthesis, characterization and luminescence properties of LnIII (Ln = Eu, Tb, Ce, Sm, Dy) complexes containing a terpyridine ligand and a 3d-4f type conjugated terpyridine-alkyne bridging EuIII-Co0 carbonyl cluster complex

Seven new organic trivalent lanthanide complexes containing a terpyridine or terpyridine-alkyne ligand, [Ln(L1)(CH3OH)(NO3)(3)] (Ln = Eu 1, Tb 2, Ce 3, Sm 4, Dy 5; L1=4-(4-bromophenyI)-2,2':6',2"-terpyridine) and [Ln(L2)(NO3)(3)] (Ln=Eu 6, Tb 7; L2 = 4-(4-trimethylsilyl phenylacetylene)-2,2':6',2"-terpyridine), were synthesized by the reaction of Ln(NO3)(3)center dot 6H(2)O (Ln = Eu, Tb, Ce, Sm, Dy) with L1 and L2, respectively. In addition, a new 3d-4f type conjugated Eu-III-Co-0 carbonyl cluster complex, [(NO3)(3)Eu(eta(3)-L2-mu) (Co-2(CO)(6))] 8, was obtained by the reaction of complex 6 with Co-2(CO)(8) in THF. All of these complexes were characterized and X-ray single-crystal diffraction reveals that the Ce-III ion is ten-coordinated and lies approximately in the center of a polyhedron with 16 faces in the structure of complex 3. The molecular conformation is stabilized by intra- and intermolecular hydrogen bonds, and intermolecular pi-Br and pi-pi interactions. The luminescence properties of these complexes were also investigated in the solid state. (C) 2014 Elsevier Ltd. All rights reserved.