Tetraaqua(1,10-phenanthroline-kappa(2) N, N ')copper(II)naphthalene-1,5-disulfonate dihydrate

In the title structure, [Cu(C12H8N2)(H2O)(4)](C10H6S2O6)center dot-2H(2)O, the cation lies on a crystallographic twofold rotation axis and the anion lies on a centre of inversion. The Cu-II atom is coordinated by two N atoms of a 1,10-phenanthroline ligand and four O atoms from four water ligands in a distorted octahedral geometry. The unique Cu-O distances are 2.054 (2) and 2.088 (2) angstrom and the Cu-N distance is 2.073 (2) angstrom. In the crystal structure, a three-dimensional supramolecular framework is constructed by extensive intermolecular O-H center dot center dot center dot O hydrogen bonds.

Interactions of thiamine with anions: (Hthiamine)(thiamine) heptaiododimercurate dihydrate and its dimethanol monohydrate

In the title compounds, 3-[(4-amino-2-methyl-5-pyrimidinio)methyl] -5-(2-hydroxyethyl)-4-methylthiazolium(2+) 3-[(4-amino-2-mcthyl-5-pyrimidinyl)methyl]-5-(2-hydroxyethyl)-4-methylthiazolium( 1+) heptaiododimercurate dihydrate, (C12H18N4OS)(C12H17N4OS)[Hg2I7]. 2H(2)O, (I), and its dimethanol monohydrate, (C12H18N4OS)(C12H17N4OS)[Hg2I7]. 2CH(3)OH . H2O (2), a crystallographic centre of symmetry in (1) or a twofold axis in (2) is imposed between the protonated and deprotonated thiamine molecules, resulting in a statistically half-occupied proton attached at N1' of the pyrimidine ring. The Hg2I73- anion, residing on the centre of symmetry in (1) or on the twofold axis in (2), interacts with two thiamine molecules, each through a C2-H ... I ... pyrimidine-ring interaction. This bridging interaction is a characteristic of thiamine in the F conformation.

STRUCTURE OF AQUABIS-(PICOLINATO)SCANDIUM HYDROXIDE DIHYDRATE

The crystal structure of the title complex was established by X-ray diffraction analysis. Each scandium ion is seven-coordinated by two oxygen atoms and two nitrogen atoms from the picolinato ions, one water oxygen atom and two hydroxide ions. The nitrogen atom and one carboxyl oxygen atom of each picolinato ion are coordinated to the same scandium ion to form a five-membered chelating ring. Each hydroxide ion is coordinated to two scandium ions to form hydroxide bridges and a dimeric molecule unit.

Synthesis and characterization of two novel [Ru(bpy)(2)(phen)](2+)-based electrochemiluminescent labels

Two novel electrochemiluminescent labels, bis(2,2'-bipyridine)[5-(3-carboxylic acid-propionamido)1,10-phenanthroline]ruthenium(II) hexafluorophosphate dihydrate and bis(2,2'-bipyridine)[5-(4-carboxylic acid-butanamido)-1,10-phenanthroline]ruthenium(II) hexafluorophosphate dihydrate, were synthesized and confirmed by IRelemental analysis, and H-1-NMR spectra were completely assigned using the (HH)-H-1-H-1 COSY technique. Cyclic voltammograms with different scan rates showed quasireversible electrochemical behaviour of the two Ru (II) complex labels in MeCN solution. Electronic absorption, photoluminescence and electrochemiluminescence of Ru(II) complexes were also characterized. Copyright (C) 2000 John Wiley & Sons, Ltd.

Structural characterization and luminescence studies of new lanthanide(III) complexes with nicotinic and isonicotinic acid N-oxides

Four new polymeric lanthanide(III) complexes of nicotinic acid N-oxide and isonicotinic acid N-oxide have been synthesized and structurally determined. In the isomorphous compounds [(Ln(L-1)(3) (H2O)(2))(n)]. 4nH(2)O(HL1 = nicotinic acid N-oxide; Ln = Eu, 1; Ln = Er, 2) the lanthanide(III) ions form infinite double chains along the b direction through the coordination of bridging carboxylate and N-oxide groups. The chains are cross-linked through hydrogen bonds between aqua ligands and uncoordinated N-oxide groups and between aqua ligands and lattice water molecules, to form a three-dimensional network. [(Eu(L-2)(2)-(H2O)(4))(n)](NO3)(n). nH(2)O (HL2 = isonicotinic acid N-oxide, 3) has a polymeric structure in which the europium (III) ions are connected into infinite chains by pairs of syn-syn carboxylate groups. Adjacent chains are interlinked by hydrogen bonds between aqua ligands and N-oxide groups to form a layer parallel to the (100) plane, and such layers are connected by hydrogen bonds between nitrate anions and aqua ligands, and between oxide groups and lattice water molecules, into a three-dimensional network. In [(Er-2(L-2)(4)(H2O)(10))](NO3)(2). H2O, 4, dinuclear units are inter-linked into a three-dimensional network through hydrogen bonding between aqua ligands and N-oxide groups of both bidentate bridging and unidentate L-2 ligands. Factors affecting the formation of coordination chains and dinuclear units are discussed. Luminescence properties of 1 and 3 have also been studied. (C) 1998 Elsevier Science Ltd. All rights reserved.

Structure of hydrated dysprosium picolinate, [Dy(C5H4NCO2)(3)(H2O)(2)]2.8H(2)O

The crystal structure of the title compound was determined by X-ray diffraction. The dysprosium ion is eight-coordinated by three oxygen atoms and three nitrogen atoms from three picolinato ions and two water oxygen atoms. The nitrogen atom and one carboxyl oxygen atom of each picolinato ion are coordinated to the same dysprosium ion to form a five-membered chelating ring. The title compound exists as discrete molecules in the crystal structure.