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Ladder-like [CrCu] coordination polymers containing unique bridging modes of [Cr(C2O4)3]3− and Cr2O72−

Kanižaj, Lidija; Molčanov, Krešimir; Torić, Filip; Pajić, Damir; Lončarić, Ivor; Šantić, Ana; Jurić, Marijana (2019) Ladder-like [CrCu] coordination polymers containing unique bridging modes of [Cr(C2O4)3]3− and Cr2O72−. Dalton Transactions, 48 . pp. 7891-7898. ISSN 1477-9226

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Three heterometallic one-dimensional (1D) coordination polymers {; ; ; A[CrCu2(bpy)2(C2O4)4]·H2O}; ; ; n [A = K+ (1) and NH4+ (2) ; bpy = 2, 2’-bipyridine] and [(Cr2O7)Cu2(C2O4)(phen)2]n (3 ; phen = 1, 10- phenanthroline) with uncommon topology have been synthesized using a building block approach and characterized by single-crystal X- ray diffraction, IR and impedance spectroscopies, magnetization measurements, and DFT calculations. Due to the partial decomposition of the building block [Cr(C2O4)3]3−, all three compounds contain oxalate-bridged [Cu2(L)2(μ-C2O4)]2+ units [L = bpy (1 and 2) and phen (3)]. In compounds 1 and 2 these cations are mutually connected through oxalate groups from [Cr(C2O4)3]3−, thus forming ladderlike topologies. Unusually, three different bridging modes of the oxalate ligand are observed in these chains. In compound 3 copper(II) ions from cationic units are bridged through the oxygen atoms of Cr2O72− anions in a novel ladder-like mode. Very strong antiferromagnetic coupling observed in all three compounds, determined from the magnetization measurements and confirmed by DFT calculations (J = −343, −371 and −340 cm−1 for 1, 2 and 3, respectively), appears between two copper(II) ions interacting through the oxalate bridge.

Item Type: Article
Additional Information: This work has been supported by the Croatian Science Foundation under Project No. IP-2014-09-4079 and UIP-2014-09-8276.
Uncontrolled Keywords: coordination polymers ; bridging oxalate ; bridging dichromate ; ladder-like topology ; antiferromagnetic interaction
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Materials Chemistry
Division of Physical Chemistry
Project titleProject leaderProject codeProject type
Multiferični i magnetoelektrični sustavi-FerMaElDamir PajićUIP-2014-09-8276HRZZ
Novi metal-organsi sustavi s oksalatnim i kinoidnim ligandima s podešenim svojstvima pogodnim za primjenu-NMOSBOQLWTPSFPKrešimir MolčanovIP-2014-09-4079HRZZ
Depositing User: Lidija Kanižaj
Date Deposited: 30 Apr 2020 13:05
DOI: 10.1039/C9DT01195A

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