The in situ combination of M(II) cations (Co, Ni, Cu or Zn) with 2,4,6-pyridinetricarboxylic acid as a ligand, a bisamidinium dication as a H-bond donor tecton and NaOH leads to the formation of anionic metal complexes ML2(2-) and their interconnection into isomorphous 3D H-bonded networks displaying different colours which were used as preformed seed crystals for the formation of crystals of c...

Application of polynuclear metal clusters for phasing X-ray crystal structures of macromolecules is discussed. Their strong isomorphous and anomalous scattering signal is particularly useful for phasing structures of large macromolecules and complexes, especially at low resolution. The popularity of the metal clusters in macromolecular crystallography is expected to grow in the future. To cite ...

We have used Mössbauer emission spectroscopy to study an oxygenated heme complex, produced in a frozen solution by nuclear decay from the isomorphous (57)Co-labeled compound. The Mössbauer parameters agree with those obtained by Mössbauer absorption spectroscopy of oxyhemoglobin. Thus, a nonprotein environment for iron can duplicate the unique oxyhemoglobin Mössbauer spectrum. The electronic st...

Five coordination polymers with the stoichiometry CaX2(valine)2(H2O)2 (X = Cl, Br) were obtained from the corresponding calcium halides and either racemic and enantiopure valine. In all cases the zwitterionic amino acid is exclusively O coordinated and the halides act as counteranions for the resulting one-dimensional cationic chains. The enantiopure chloride shows dimorphism; both forms differ...

The crystal structures of the new isomorphous compounds iron(III) oxyfluorotellurate(IV), FeTeO(3)F, gallium(III) oxyfluorotellurate(IV), GaTeO(3)F, and chromium(III) oxyfluorotellurate(IV), CrTeO(3)F, consist of zigzag chains of MO(4)F(2) distorted octahedra alternately sharing O-O and F-F edges and connected via TeO(3) trigonal pyramids. A full O/F anionic ordering is observed and the electro...

Localization of 2,4-dichloroand 2,4-dibromophenol in multilamellar vesicles in a 1/1 dihalogenated phenol/lipid molar ratio was investigated by classical contrast variation X-ray scattering using the isomorphous replacement method. The results were compared with those obtained by anomalous small-angle X-ray scattering from a vesicle system doped with 2,4-dibromophenol. Dissimilarities in the re...