1. Copper(II) salts and complexes of 2-amino-5-nitropyridine.
- Author
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Bellesis, Andrew G., Villani-Gale, Alexander J., Dickie, Diane A., Jasinski, Jerry P., Landee, Christopher P., Wikaira, Jan L., Willett, Roger D., and Turnbull, Mark M.
- Subjects
SPACE groups ,MAGNETIC susceptibility ,COPPER compounds ,DEUTERIUM ,MAGNETISM - Abstract
Four new copper compounds of 2-amino-5-nitropyridine/pyridinium (5NAP/5NAPH) have been prepared and characterized: (5NAPH)
2 [CuBr4 ], 2; (d2 -5NAPD)2 [CuBr4 ], 2a; (5NAP)2 CuCl2 , 3; (5NAP)2 CuBr2 , 4. Compounds 2 and 2a are isomorphous and crystallize in the triclinic space group P-1. Packing is stabilized by hydrogen/deuterium bonds. Short Br...Br contacts provide potential magnetic superexchange pathways, but only very weak antiferromagnetic exchange is observed (J/kB ∼-2 K). Compounds 3 and 4 are also isomorphous and crystallize in the monoclinic space group P21 /c. The molecules are linked into chains by bihalide bridges, and the chains linked into rectangular/square layers by short X...X. contacts. Variable temperature magnetic data were best fit by the S = ½ antiferromagnetic rectangular model for 3 (C = 0.429(1) emu-K/mol-Oe, J/kB = −9.38(6) K, J'/kB = −5.91(4) K). Variable temperature magnetic susceptibility data for 4 were best fit by the two-dimensional antiferromagnetic square lattice model (C = 0.43(1) emu-K/mol-Oe, J/kB = −36.5(2) K). [ABSTRACT FROM AUTHOR]- Published
- 2024
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