Diaqua tetrabenzo (b,f,j,n,) {1,5,9,13} tetraazacyclohexadecine copper(II)and nickel(II) bisanthraflavates: crystal and molecular structure

Citation
Me. Sanchez-vergara et al., Diaqua tetrabenzo (b,f,j,n,) {1,5,9,13} tetraazacyclohexadecine copper(II)and nickel(II) bisanthraflavates: crystal and molecular structure, J CHEM CRYS, 28(11), 1998, pp. 825-830
Citations number
5
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF CHEMICAL CRYSTALLOGRAPHY
ISSN journal
10741542 → ACNP
Volume
28
Issue
11
Year of publication
1998
Pages
825 - 830
Database
ISI
SICI code
1074-1542(199811)28:11<825:DT({TC>2.0.ZU;2-6
Abstract
Charge transfer molecular solids [diaqua tetrabenzo (b,f,j,n,) {1,5,9,13} t etraazacyclohexadecine] Ni(II) and Cu(Il) bisanthraflavates were synthesize d and characterized by IR, Mass Spectrometry, TGA, and X-ray diffraction on single crystals. Unit cell dimensions (Angstrom) a = 12.291(1), c = 14.574 (1) Angstrom and a = 12.434(1), c = 14.066(1) Angstrom for Cu(II) and Ni(II ) derivatives, respectively, space group P4(2)/n in both cases. The obtaine d compounds show expected chemical and structural similarities. Tetraazamac rocycles are surrounded individually by a zig-zag, ribbon-like motif extend ing in the crystal by head-to-tail hydrogen bonding of monosubstituted anth raflavates. Electric conductivities were measured by the four points method as pellets from the variation of electric current through the sample as a function of temperature, for fixed voltages in the ohmic regime. Preliminar y results indicate low conductivity values at room temperature but semicond uctivity behaviour in the temperature range -150 to 170 degrees C.