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Self-Assembly of a Mn9 Nanoscopic Mixed-Valent Cluster: Synthesis, Crystal Structure, and Magnetic Behavior

Mondal, Kartik Chandra and Song, You and Mukherjee, Partha Sarathi (2007) Self-Assembly of a Mn9 Nanoscopic Mixed-Valent Cluster: Synthesis, Crystal Structure, and Magnetic Behavior. Inorganic Chemistry , 46 (23). pp. 9736-9742. ISSN 0020-1669

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ic701018x

Abstract

A rare Mn9 μ3-oxo-centered mixed-valent cluster [Mn9O7(O2CPh)11(thmn)(py)2 (H2O)3] (1) is prepared by assembling an oxo-centered MnIIMnIII2 triangle, [Mn3O(O2CPh)6(py)2(H2O)]·0.5MeCN, as the secondary building unit in the presence of a tripodal alcohol, 1,1,1-tris(hydroxymethyl)nitromethane (H3thmn), as the capping ligand. Complex 1 was formed along with a minor byproduct, [Mn6O2(O2CPh)10(MeCN)4] (2). Complex 1 was characterized by X-ray single-crystal structure analysis and was crystallized in a monoclinic system, space group P21/n, a = 16.214(6) Å, b = 25.874(10) Å, c = 26.497(10) Å, and β = 94.214(7)°. The Manganese−oxo−carboxylate core in 1 looks like a funnel. Variable-temperature magnetic studies down to 2 K reveal the existence of dominant ferromagnetic interaction within the cluster. Alternating current susceptibility data of the cluster show strong frequency dependence of both the real and imaginary parts of susceptibility χ‘ and χ‘ ‘ below 5 K. Moreover, the calculated relaxation time, τ0 = 1.2 × 10-7 s, and the energy barrier, ΔE = 25 K, are consistent with the single-molecule magnetic behavior of 1.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Analytical Science > Microscopy and probe methods
Physical Science > Nanomagnetics
Material Science > Nanostructured materials
Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:3908
Deposited By:JNCASR
Deposited On:27 Jan 2009 04:13
Last Modified:27 Jan 2009 04:13

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