Interplay between the structural and magnetic probes in the elucidation of the structure of a novel 2D layered V_4O_4(OH)_2(O_2CC_6H_4CO_2)_4·DMF

Scientific paper - Original scientific paper

• Author: Igor Đerđ
• Author: Srečo D. Škapin
• Author: Miran Čeh
• Author: Zvonko Jagličić
• Author: Damir Pajić
• Author: Bojan Kozlevčar
• Author: Bojan Orel
• Author: Zorica Crnjak Orel; MBZ: 266564
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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 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. [V_4O_4(OH)_2(O_2CC_6H_4CO_2)_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, β = 123.70(6)º, V = 2120.1(9)Å^3, 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 (V^4+) and distorted corner-shared square pyramids (V^5+). 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 V_4O_4(OH)_2(O_2CC_6H_4CO_2)_4•DMF can be described by a linear antiferromagnetic chain model, with the isotropic exchange interaction of J = −75 K between the nearest V^4+ neighbours of S = 1/2.

• Keywords (english): inorganic-organic hybrid; structural characterization; magnetic properties
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Accepted version
• Journal title: Dalton Transactions
• Numbering: vol. 41, no. 2, pp. 581-589
• p-ISSN: 0300-9246
• DOI: https://doi.org/10.1039/C1DT10985E
• URN:NBN: urn:nbn:hr:217:186437
• Publication: 2012
• Project: Number: 098-0982886-2894; Title (croatian): Tanki filmovi legura silicija na prijelazu iz amorfne u uređenu strukturu; Leader: Davor Gracin; Jurisdiction: Croatia; Funding stream: ZP
• Project: Number: 119-1191458-1017; Title (croatian): Nanomagneti; Leader: Krešo Zadro; Jurisdiction: Croatia; Funding stream: ZP
• Document URL: https://pubs.rsc.org/en/content/articlelanding/2012/DT/C1DT10985E#!divAbstract
• Type of resource: Text
• Access conditions: Open access
• Created on: 2019-11-15 19:47:15