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Magneto-Structural Characterization of Oxalamide Dihalo-Bridged Copper Dimers: Intra- and Interdimer Interactions Studied by Single Crystal ESR Spectroscopy

Žilić, Dijana; Maity, Debdeep; Cetina, Mario; Molčanov, Krešimir; Džolić, Zoran; Herak, Mirta (2017) Magneto-Structural Characterization of Oxalamide Dihalo-Bridged Copper Dimers: Intra- and Interdimer Interactions Studied by Single Crystal ESR Spectroscopy. ChemPhysChem, 18 . pp. 2397-2408. ISSN 1439-7641

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Abstract

The detailed single crystal electron spin resonance (ESR) analysis of oxalamide complexes with halogen-bridged copper dimers, supported by X-ray, magnetic susceptibility and powder ESR studies, is reported. Four complexes with two different ligands were synthesized: [CuLA(μ-X)]2 and [CuLV(μ-X)]2, where LA = N-(L-alanine methyl ester)-N’-((2-pyridine-2-yl)methyl)oxalamide and LV=N-(L-valine methyl ester)-N’-((2-pyridine- 2-yl)methyl)oxalamide, while X=Cl or Br. X-ray analysis shows that geometry at each copper(II) ion is square pyramidal while two pyramids share one base-to-apex edge with parallel basal planes. The complexes are linked by hydrogen bonds into infinite chains and further into a 3D network. Susceptibility measurements show that coppers in dimers are weakly antiferromagnetically coupled (|J| = 1 − 2 cm−1). From powder ESR, g-values and dx2−y2 orbital as the ground state of unpaired electron are determined. The complexes show unusual anisotropic splitting and merging of ESR lines when their single crystals rotate in magnetic field. The observation of this partially resolved intradimer dipolar splitting enabled estimation of weak interdimer exchange interaction parameter |J0| = 0.001 cm−1.

Item Type: Article
Uncontrolled Keywords: copper ; dipolar splitting ; EPR spectroscopy ; magnetic properties ; single crystal
Subjects: NATURAL SCIENCES > Physics > Condensed Matter Physics
NATURAL SCIENCES > Chemistry > Inorganic Chemistry
Divisions: Division of Organic Chemistry and Biochemistry
Division of Physical Chemistry
Projects:
Project titleProject leaderProject codeProject type
utjecaj magnetske anziotropije na kvantne spinske sustave-IMAQSSMirta HerakUIP-2014-09-9775HRZZ
Depositing User: Dijana Žilić
Date Deposited: 06 Sep 2017 12:24
Last Modified: 06 Sep 2017 12:24
URI: http://fulir.irb.hr/id/eprint/3556
DOI: 10.1002/cphc.201700433

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