[Multi-spectroscopy applied to study blue gel pen inks].

Multi-spectroscopy, such as FTIR, dispersive Raman spectroscopy and UV-Vis, was applied to characterize the blue gel pen inks on paper at the time in the present study. Twenty eight collected blue gel pens with different brands and serials were separated into four different classes by different absorptions or Raman shift. Composition changing of blue gel pen inks on paper during artificial ageing was studied via TD-MS as well. The advantage and disadvantage of this spectroscopy used in analyzing and identifying blue gel pen inks on paper, and the potential application in the research on relative and absolute ageing of documents were discussed.

Meta-barium borate, II-BaB2O4, at 163 and 293 K.

The single-crystal X-ray diffraction structure analysis of an excellent non-linear optical material, viz. II-BaB2O4 or Ba3(B3O6)2, has been carried out at 163 and 293 K. The two sets of structural data are compared and indicate a significant shortening of the c axial length in the unit cell at 163 K, whereas the a and b axial lengths essentially do not change.

[mu-N,N'-Bis(2-aminoethyl)oxamidato(2-)]bis[(4,5-diazafluoren-9-one)perchloratocopper(II)] 4,5-diazafluoren-9-one disolvate.

The title compound, [Cu2(C6)H12N4O2)(ClO4)2(C11H6N2O)2].-2C11H6N2O, contains a dinuclear copper(II) complex which lies about a twofold axis at the mid-point of the C-C bond of the oxamide ligand that bridges the two Cu(II) atoms. The Cu...Cu distance is 5.215 (2) A and the Cu atoms have distorted octahedral coordination geometry. Intramolecular N-H...O and N-H...N hydrogen bonds and intermolecular C-H...O hydrogen bonds, together with pi-pi stacking interactions, dominate throughout the crystal structure.

Cyano-bridged extended heteronuclear supramolecular architectures with hexacyanocobalt(III) as building blocks.

The cyano-bridged heteronuclear coordination polymer poly[tris[(5,12-dimethyl-7,14-diphenyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene)copper(II)]-hexa-mu-cyano-bis[tricyanocobalt(III)] dimethylformamide solvate trihydrate], {[Cu3Co2(CN)12(C24H32N4)3].C3H7NO.3H2O}n, was synthesized by the assembly reaction of [CuL]2+ (L is 5,12-dimethyl-7,14-diphenyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene) and [Co(CN)6]3- in a dimethylformamide-water solution. The structure consists of neutral cyano-bridged Cu3Co2 units with the unique Co atom in a general position and all three Cu atoms on independent inversion centres. Each [Co(CN)6]3- ion connects three CuII ions via three cyano groups to form a novel cyano-bridged two-dimensional stair-shaped-layer structure. The water and dimethylformamide molecules are situated in the inter-fragment spaces.