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Chemistry professor Mark Turnbull and his students create new compounds in order to study complex magnetic properties. Dr. Turnbull also sponsors students, like chemistry minor Lesley Mathews, who want to pursue internships in the local area. |
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Linear magnetic chains
Amaral, Stephanie and Mark M. Turnbull, "Synthesis and structure of bis(2,6-dimethylpyrazine)(THF)copper(II) nitrate,"
Journal of Chemical Crystallography, Vol. 32, Nos. 1-2, February 2002, pp. 11-16.
Abstract
Attempts to crystallize Cu(2,6-dmpz)(NO3)2 [2,6-dmpz = 2,6-dimethylpyrazine] by reaction
of 2,6-dmpz with Cu(NO3)2 · 3H2O in THF resulted in the synthesis of
Cu(2,6-dmpz)2(NO3)2· THF. The compound crystallized in the monoclinic space group C2/c and exists as isolated molecules with distorted square pyramidal geometry:
a = 11.609(4) Å,b = 10.415(3) Å,c = 18.256(6) Å, ß = 108:332(4)º. The 2,6-dmpz
molecules coordinate to the Cu ions through the distal (remote from the methyl) nitrogens.
The molecules are arrayed in stacks parallel to the b-axis.
a = 11.609(4) Å,b = 10.415(3) Å,c = 18.256(6) Å, ß = 108:332(4)º. The 2,6-dmpz
molecules coordinate to the Cu ions through the distal (remote from the methyl) nitrogens.
The molecules are arrayed in stacks parallel to the b-axis.
Full text can be viewed in PDF at Kluwer Academic Publishers. Under "Search Journal Articles," enter Amaral and Turnbull.
Amaral, Stephanie, William E. Jensen, Christopher P. Landee, Mark M. Turnbull, and F. Matthew Woodward, "Quantum linear magnetic chains: structure and magnetic behavior of (2-methylpyrazine)copper(II) nitrate," Polyhedron,
Vol. 20 (2001) pp. 1317-1322.
Abstract
The X-ray structure, susceptibility and magnetization of (2-methylpyrazine)copper(II) nitrate are reported. The compound crystallizes in the space group Pmna as a coordination polymer of Cu(II) ions bridged by 2-methylpyrazine. The resulting chains are magnetically well isolated and the susceptibility of the compound is well modeled as a one-dimensional Heisenberg antiferromagnet with 2J=9.5(1) K. High-field magnetization studies to 30 T confirm the value of the exchange constant.
For full text in PDF format, click here. Posted with permission from Elsevier Science. Single copies of this article may be downloaded and printed for the reader's personal research and study.
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Additional Resources
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