Heterometallic Heptanuclear Cu(5)Ln(2)] (Ln = Tb, Dy, and Ho) Single-Molecule Magnets Organized in One-Dimensional Coordination Polymeric Network

Dey, Atanu and Das, Sourav and Kundu, Subrata and Mondal, Abhishake and Rouzieres, Mathieu and Mathoniere, Corine and Clerac, Rodolphe and Narayanan, Ramakirushnan Suriya and Chandrasekhar, Vadapalli (2017) Heterometallic Heptanuclear Cu(5)Ln(2)] (Ln = Tb, Dy, and Ho) Single-Molecule Magnets Organized in One-Dimensional Coordination Polymeric Network. In: INORGANIC CHEMISTRY, 56 (23). pp. 14612-14623.

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Abstract

The reaction of a multisite coordination ligand, LH3, with Cu(II) salts and Ln(NO3)(3)center dot nH(2)O in a 1:2:1 stoichiometric ratio in the presence of triethylamine was found to afford a series of one-dimensional heterometallic {Cu(5)Ln(2)(L)(2)(mu(3)-OH)(4)(ClO4)-(NO3)(3)(OH2)(5)}(ClO4)(2)(H2O )(x)](infinity) Ln = Tb(1), Dy(2) and Ho(3), x = 4.25, 5.5, and 5 for 1-3, respectively] coordination polymers. Complexes 1-3 have been characterized by single crystal X-ray crystallography. The detailed study of the magnetic properties has also been performed and compared with the parent Cu(5)Ln(2)] molecular analogues. The ac susceptibility measurements for complexes 1-3 confirm their SMM behavior with the following characteristics: Delta(eff)/k(B) = 23.4 K, tau(0) = 1.1 x 10(-6) s and Delta(eff)/k(B) = 27.9 K, tau(0) = 6.6 x 10(-7) s under 0 and 1200 Oe dc fields, respectively for 1; Delta(eff)/k(B) = 8.3 K, tau(0) = 3.1 x 10(-6) s for 2 under 0 dc field. For 3, the fast QTM below 4 K prevents the estimation of the SMM energy barrier. Remarkably, the magnetic and SMM properties of the previously reported molecular Cu(5)Ln(2)] analogues are preserved after their assembly in these coordination networks.

Item Type:	Journal Article
Publication:	INORGANIC CHEMISTRY
Additional Information:	Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	27 Dec 2017 10:13
Last Modified:	27 Dec 2017 10:13
URI:	http://eprints.iisc.ac.in/id/eprint/58544

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