Bernard Tinant

Spin crossover and supramolecular organization of a new family of iron(II) dinuclear complexes (poster)

24 European Crystallographic Meeting, ECM24, Marrakech, 2007 Page s156 Acta Cryst. (2007). A63, s156 It was shown that optical properties of both 1 and 2 correlate with the local ligand environments observed in the crystal structures. In both cases, the rigidity of the stilbene linker increases upon coordination to the inorganic units through inhibition of torsion about the central ethylene bond, resulting in luminescent crystals with increased emission lifetimes compared to solutions of trans-stilbene. The emission spectrum of 2 is found to depend on the nature of the incorporated solvent molecules, suggesting use of this or related materials in sensor applications.

Novel water-soluble peroxo complexes of Nb(V) and Ta(V)

C297 bonds in the crystal structure but crystal packing is stabilized by eight C-H··· and four ··· interactions. Some of the C-H··· interactions are with the H···Cg distance shorter than 2.70Å (Cg is the centroid of fiveor six-membered ring with delocalized bonds). Two of the C-H··· interactions are intramolecular and play a very significant role in the orientation of phenyl rings and -OCH2CH3 fragments.

Crystal structure of tetraguanidinium dioxo-tetraperoxo-mu-tartrato-dimolybdate(VI) dihydrate, (CN3H6)(4)[Mo2O2(O-2)(4)(C4H2O6)]center dot 2H(2)O

C16H60Mo4N24O36, orthorhombic, Pna2(1) (No. 33), a = 29.387(9) Angstrom, b = 9.979(3) Angstrom, c = 19.062(5) Angstrom, V = 5590.0 Angstrom(3), Z = 4, R-gt(F) = 0.094, wR(ref)(F-2) = 0.264, T = 293 K.