3D oxalate-based coordination polymers: relationship between Structure, magnetism and color, studied by high-field ESR spectroscopy

Žilić, Dijana; Molčanov, Krešimir; Jurić, Marijana; Habjanič, Jelena; Rakvin, Boris; Krupskaya, Yulia; Kataev, Vladislav; Wurmehl, Sabine; Büchner, Bernd (2017) 3D oxalate-based coordination polymers: relationship between Structure, magnetism and color, studied by high-field ESR spectroscopy. Polyhedron, 126 . pp. 120-126. ISSN 0277-5387

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Abstract

The detailed high field electron spin resonance (HF-ESR) study of three 3D oxalate-based coordination polymers with antiferromagnetic ordering below 13 K, supported by crystallographic, photoluminescence (PL), elemental (EDX) and X-band ESR analysis, is presented. Two of the investigated compounds are described by the same chemical formula [[Cu(bpy)3][Mn2(C2O4)3]H2O]n, both exhibit PL but have different colors: green-blue and red-pink (CuMn2-Green and CuMn2-Red, respectively) while third compound [[Co(bpy)3][Mn2(C2O4)3]H2O]n is yellow (CoMn2-Yellow) without PL. Despite different colors of CuMn2-Green and CuMn2-Red, X-ray diffraction, EDX, as well as X-band ESR, could not reveal any difference between these compounds. Therefore, detailed temperature dependent multifrequency HF-ESR experiments were performed. Owing to very high resolution of HF-ESR, two different Mn(II) centers in CuMn2-Green and CoMn2-Yellow compounds could be resolved, while in CuMn2-Red only one Mn(II) center is detected. A possible difference in the ligand coordination of Mn(II) ions in the oxalate-networks of CuMn2-Green and CuMn2-Red, that gives rise to slightly different g-factors, is discussed with respect to the different colors of these compounds.

Item Type:	Article
Uncontrolled Keywords:	ESR ; high field ; high frequency ; coordination polymer ; Mn(II)
Subjects:	NATURAL SCIENCES > Physics > Condensed Matter Physics NATURAL SCIENCES > Chemistry > Inorganic Chemistry
Divisions:	Division of Materials Chemistry Division of Physical Chemistry
Projects:	Project title Project leader Project code Project type Istraživanje molekulskih magneta (polinuklearnih kompleksa prijelaznih metala) HF-EPR spektroskopijom - Dijana Žilić PD-02.03/164 HRZZ Karakterizacija niskotemperaturne molekulske dinamike sustava s neuređenom rešetkom metodom ESR-DESiRe Marina Ilakovac Kveder IP-11-2013-1108 HRZZ Novi metal-organsi sustavi s oksalatnim i kinoidnim ligandima s podešenim svojstvima pogodnim za primjenu-NMOSBOQLWTPSFP Krešimir Molčanov IP-09-2014-4079 HRZZ UNSPECIFIED UNSPECIFIED DFG-FOR1154 UNSPECIFIED
Depositing User:	Dijana Žilić
Date Deposited:	14 Feb 2017 11:57
URI:	http://fulir.irb.hr/id/eprint/3374
DOI:	10.1016/j.poly.2017.01.009

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