A second polymorph with composition Co(3)(PO(4))(2)·H(2)O.

Single crystals of Co(3)(PO(4))(2)·H(2)O, tricobalt(II) bis-[ortho-phosphate(V)] monohydrate, were obtained under hydro-thermal conditions. The compound is the second polymorph of this composition and is isotypic with its zinc analogue, Zn(3)(PO(4))(2)·H(2)O. Three independent Co(2+) cations are bridged by two independent orthophosphate anions.

Co(3)(PO(4))(2)·4H(2)O.

Single crystals of Co(3)(PO(4))(2)·4H(2)O, tricobalt(II) bis-[ortho-phosphate(V)] tetra-hydrate, were obtained under hydro-thermal conditions. The title compound is isotypic with its zinc analogue Zn(3)(PO(4))(2)·4H(2)O (mineral name hopeite) and contains two independent Co(2+) cations. One Co(2+) cation exhibits a slightly distorted tetra-hedral coordination, while the second, located on a mirror plane, has a distorted octa-hedral coordination environment.

Electronic and vibrational spectroscopy of cis-beta-[CrCl(2)(1,4,7,11-tetrazaundecane)chromium(III) perchlorate.

The sharp-line absorption spectrum of cis-beta-[CrCl(2)(2,2,3-tet)]ClO(4) (2,2,3-tet: 1,4,7,11-tetraazaundecane) has been measured between 13,000 and 16,000 cm(-1) at 5K. The 77K emission, 298 K infrared and visible spectra have also been measured. The zero-phonon band in the highly resolved absorption spectrum splits into four components.

Structural and spectroscopic properties of trans-dichlorobis(2,2-dimethyl-1,3-diaminopropane)chromium(III) chloride.

The structure of trans-[CrCl(2)(Me(2)tn)(2)]Cl (Me(2)tn=2,2-dimethylpropane-1,3-diamine) has been determined by a single-crystal X-ray diffraction study at 150K. The analysis reveals that there are two independent Cr(III) complex cations in the structure, one with crystallographic inversion symmetry and the other with two-fold rotation symmetry, which are conformational isomers of each other. In both conformations, the chromium atom adopts a distorted octahedral structure with the four nitrogen atoms of two Me(2)tn ligands occupying the equatorial plane and two chlorine atoms occupying trans-axial positions.

Structural and spectroscopic properties of trans-difluoro(1,4,8,12-tetraazacyclopentadecane)chromium(III) perchlorate hydrate.

The structure of [CrF(2)([15]aneN(4))]ClO(4).H(2)O ([15]aneN(4)=1,4,8,12-tetraazacyclopentadecane) has been determined by a single-crystal X-ray diffraction study at 173 K. The complex crystallizes in the space group P1- of the triclinic system with two mononuclear formula units in a cell of dimensions a=9.

Optical sensor for the determination of glucose based on KIO4 chemiluminescence detection.

A method to determine glucose using an optical sensor prepared by entrapping glucose oxidase into silica sol-gel column has been developed. The silica sol-gel film was coated on alumina substrate. The optical sensor is based on the chemiluminescence intensity from the reaction of periodate and hydrogen peroxide in K2CO3 medium.

Spectroscopic and ligand-field properties of [L-prolylglycinato][di(3-aminopropyl)amine]chromium(III) perchlorate.

The mixed ligand complex [Cr(L-progly)(dpt)]ClO4 [H2progly = prolylglycine, dpt = di(3-aminopropyl)amine] has been prepared, and its geometric structure was discussed on the basis of electronic absorption and IR spectral data. The emission and excitation spectra taken at 77 K were also reported. The 12 electronic bands due to spin-allowed and spin-forbidden transitions were assigned.

Ethylenediammonium bis[bis[N-(2-aminoethyl)glycinato-kappa(3)N,N',O]chromium(III)] tetrachloride dihydrate at 293 and 100 K.

The crystal structure of the title compound, (C(2)H(10)N(2))[Cr(C(4)H(9)N(2)O(2))(2)](2)Cl(4) x 2H(2)O, has been determined by single-crystal X-ray diffraction studies at 293 and 100 K. The analyses demonstrated that the crystal consists of ethylenediammonium dications (which lie about inversion centres), bis[N-(2-aminoethyl)glycinato]chromium(III) monocations, Cl(-) anions and hydrate water molecules, in a molecular ratio of 1:2:4:2. The complex cation unit has a slightly distorted octahedrally coordinated Cr atom, with two Cr[bond]O and four Cr[bond]N bonds in the ranges 1.