Jul 6 – 10, 2015
Institute of Nuclear Physics PAN, Kraków
Europe/Warsaw timezone

Control of the magnetic behaviour of cyanide-bridged Mn<sup>II</sup>-Nb<sup>IV</sup> coordination polymers by the introduction of supporting ligands.

Jul 7, 2015, 8:30 PM
1h 30m
Olimpia Conference Room (Crown Piast Hotel)

Olimpia Conference Room

Crown Piast Hotel

Board: 18


Ms Gabriela Handzlik (Faculty of Chemistry, Jagiellonian University, Kraków)


In our contribution we describe syntheses, single-crystal X-ray crystallographic structures and magnetic properties of a new family of cyanide-bridged coordination polymers {(NH4)[(H2O)MnII-(μ-L)-MnII(H2O)] [NbIV(CN)8].xH2O}n MnNbL with supporting ligands L = cyanide, formate, acetate and propionate (x = 2 or 3). MnNbL stems from a prototypical three-dimensional cyanide-bridged {[MnII(H2O)2]2[NbIV(CN)8].4H2O}n MnNb compound [1] which shows ferrimagnetic behaviour with magnetic ordering temperature Tc = 50 K. Each bridging CN- in MnNb connects the MnII (d5 configuration, S = 5/2) and NbIV (d1, S = 1/2) metal centres and enables relatively strong antiferromagnetic exchange interactions JNbMn within the NbIV-CN-MnII motif. We have managed to introduce the extra ligands that connect each two neighbouring MnII centres. The ligands were introduced at the self-assembly stage. This was done by taking advantage of the potential ‘cavities’ within the MnNb framework with the Mn-Mn distance of 6.147 Å. Additional bridging ligands change this distance to 5.631 Å in case of cyanide or 6.253 Å for formate and tune in this way the structural properties of the -Nb-CN-Mn- framework. Moreover, the bridging of the two MnII centres in MnNbL introduces additional magnetic interaction pathways with significant JMnMn¬ < 0. The new compounds show a unique magnetic behavior that might be related to magnetic frustration within a triangle of three antiferromagnetically coupled magnetic centres: two MnII and one NbIV (Figure 1). These new octacyanometallate-based compounds with additional bridging ligands demonstrate how chemists can exert considerable control over the magnetic behaviour of molecular magnets. Literature: [1] J. M. Herrera, P. Franz, R. Podgajny, M. Pilkington, M. Biner, S. Decurtins, H. Stoeckli-Evans, A. Neels, R. Garde, Y. Dromzee, M. Julve, B. Sieklucka, K. Hashimoto, S. Ohkoshi, M. Verdaguer, C. R. Chimie 11 (2008), 1192-1199

Primary authors

Dr Dawid Pinkowicz (Faculty of Chemistry, Jagiellonian University, Kraków) Ms Gabriela Handzlik (Faculty of Chemistry, Jagiellonian University, Kraków)


Prof. Barbara Sieklucka (Faculty of Chemistry, Jagiellonian University, Kraków) Dr Wojciech Nitek (Faculty of Chemistry, Jagiellonian University, Kraków)

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