Crystal structures and magnetic properties of a set of dihalo-bridged oxalamidato copper(II) dimers

Žilić, Dijana; Rakvin, Boris; Milić, Dalibor; Pajić, Damir; Đilović, Ivica; Cametti, Massimo; Džolić, Zoran (2014) Crystal structures and magnetic properties of a set of dihalo-bridged oxalamidato copper(II) dimers. Dalton Transactions, 43 (31). pp. 11877-11887. ISSN 1477-9226

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Abstract

A set of four copper(II) complexes, L1–X and L2–X (X = Cl, Br ; L1 = N-(L-leucine methyl ester)-N′-((2-pyridin-2-yl)methyl)oxalamide and L2 = N-benzyl-N′-((2-pyridin-2-yl)methyl)oxalamide), have been synthesized and characterized by X-ray structural analysis, electron paramagnetic resonance (EPR) spectroscopy on single crystals and by SQUID magnetization measurements. X-ray diffraction studies show one-dimensional hydrogen bonded networks of dimeric copper(II)-complexes bridged by two halide ions and with the two metal centers 3.44–3.69 Å apart. The geometry at each copper(II) atom is ideal or near ideal square pyramidal. EPR and SQUID studies indicate that all complexes exhibit weak antiferromagnetic interactions between the Cu(II) paramagnetic centers, with exchange parameter |J| ~ 1 cm−1. Magneto-structural comparisons among similar dihalo-bridged Cu(II) dinuclear complexes are also provided, and a possible correlation has been established.

Item Type:	Article
Uncontrolled Keywords:	copper dimers; dihalo-bridged; crystal structures; EPR; magnetization
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 title Project leader Project code Project type Molekulska struktura i dinamika sustava s paramagnetskim česticama- Marina Ilakovac-Kveder 098-0982915-2939 MZOS Nanomagneti- Krešo Zadro 119-1191458-1017 MZOS Strukturno istraživanje bioloških makromolekula metodom rentgenske difrakcije- Dubravka Matković-Čalogović 119-1193079-1084 MZOS Samo-udruživanje u gelovima i sinteza funkcionalnih hibridnih materijala- Leo Frkanec 098-0982904-2912 MZOS
Depositing User:	Dijana Žilić
Date Deposited:	24 Feb 2017 13:02
URI:	http://fulir.irb.hr/id/eprint/3399
DOI:	10.1039/C4DT00925H

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