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Copper(II) complexes of 2-amino-5-chloro-3-fluoropyridine: syntheses and magnetic properties of (3,5-FCAP)2CuX2 and (3,5-FCAPH)2CuX4
Authors:Benjamin L. Solomon  Christopher P. Landee  Jan L. Wikaira
Affiliation:1. Carlson School of Chemistry and Biochemistry, Clark University, Worcester, MA, USA;2. Department of Physics, Clark University, Worcester, MA, USA;3. Department of Chemistry, University of Canterbury, Christchurch, New Zealand
Abstract:
Using 2-amino-5-chloro-3-fluoropyridine, two new copper halide coordination complexes and two new salts have been synthesized: [(3,5-FCAP)2CuCl2] (1), [(3,5-FCAP)2CuBr2](2), (3,5-FCAPH)2[CuCl4] (3) and (3,5-FCAPH)2[CuBr4] (4) [3,5-FCAP?=?2-amino-5-chloro-3-fluoropyridine; 3,5-FCAPH?=?2-amino-5-chloro-3-fluoropyridinium]. These complexes have been analyzed through single-crystal X-ray diffraction and temperature-dependent magnetic susceptibility. Compounds 1 and 2 crystallize in the triclinic space group P-1, while 3 and 4 crystallize in the monoclinic space group P21/c. All structures were distinct, with 1 giving a bihalide bridged chain, 2 yielding a halide bridged dimer, 3 forming a two-halide bridged chain via short Cl???Cl contacts, and 4 producing a rectangular sheet via short Br???Br contacts. All four compounds exhibit anti-ferromagnetic interactions and were fit to linear chain (1 and 3), dimer (2), and rectangular 2-D sheet (4) models. The resulting J/kB values are ?3.4(1), ?31.3(8), ?0.9(1), and ?9.46(6)?K with an α value (α?=?J?/J) of 0.06(2), respectively.
Keywords:Cu(II) salts and complexes  Magnetic interactions  Pyridine complexes  X-ray structures
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