Naslov
Interplay between the Structural and Magnetic Probes in Elucidation of the Structure of Novel 2D Layered V4O4(OH)2(O2CC6H4CO2)4·DMF

Autori
Djerdj, Igor ; Škapin, Srečo D. ; Čeh, Miran ; Jagličić, Zvonko ; Pajić, Damir ; Kozlevčar, Bojan ; Orel, Bojan ; Crnjak Orel, Zorica

Izvornik
Dalton transactions (1477-9226) 41 (2012), 2; 581-589

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
inorganic-organic hybrid; structural characterization; magnetic properties

Sažetak
The title compound has been synthesized under solvothermal conditions by reacting vanadium(V) oxytriisopropoxide with terephthalic acid in N, N-dimethylformamide. A combination of synchrotron powder diffraction, infrared spectroscopy, scanning and transmission electron microscopy, thermal and chemical analysis elucidated the chemical, structural and microstructural features of new 2D layered inorganic-organic 10 framework. Due to the low-crystallinity of the final material, its crystal structure has been solved from synchrotron X-ray powder diffraction data using a direct space global optimization technique and subsequent constraint Rietveld refinement. [V4O4(OH)2(O2CC6H4CO2)4·DMF] crystallizes in the monoclinic system (space group P2/m (No. 10)) ; cell parameters: a = 20.923(4), b = 5.963(4), c = 20.425(1) Å,  = 123.70(6) º, V = 2120.1(9) Å3, Z = 2. The overall structure can be described as an array of parallel 2D layers running along [-101] direction, consisting of two types of vanadium oxidation states and coordination polyhedra: face-shared trigonal prisms (V4+) and distorted corner-shared square pyramids 15 (V5+). Both configurations form independent parallel chains oriented along the 2-fold symmetry crystallographic b-axis mutually interlinked with terephthalate ligands in a monodentate mode perpendicular to it. The morphology of the compound exhibits long nanofibers, with the growth direction along the layered [-101] axis. The magnetic susceptibility measurements show that the magnetic properties of V4O4(OH)2(O2CC6H4CO2)4·DMF can be described by a linear antiferromagnetic chain model, with the isotropic exchange interaction of J = −75 K between the nearest V4+ neighbours of S = 1/2.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA