TY - JOUR
T1 - Structure and properties of poly-bis(μ-monophenylphosphinato)bis(formamide) chain polymers of cadmium(II), manganese(H) and cobalt(II). Antiferromagnetic exchange in the manganese and cobalt compounds
AU - Betz, Peter
AU - Bino, Avi
AU - Du, Jing Long
AU - Lo, Linda S.M.
AU - Thompson, Robert C.
PY - 1990/4/2
Y1 - 1990/4/2
N2 - The compounds M(HCONH2)2[H(C6H5)PO2]2 where M = Co (1), Cd (2) and Mn (3) were synthesized and characterized using single crystal X-ray diffraction, differential scanning calorimetry, infrared spectroscopy and magnetic susceptibility (2 to 80 K) studies. The three compounds are isomorphous, their structures consisting of polymeric chains, propagating along the crystallographic b axis, in which two phosphinate ligands form double bridges between adjacent metal atoms. Two formamide molecules are coordinated via oxygen to each metal atom, completing an octahedral geometry. Compounds 1 and 3 are antiferromagnetic exhibiting maxima in their χm versus T plots at 6.3 and 5.8 K respectively. The magnetic data for the Mn(II) compound have been successfully analyzed according to the Weng and Wagner-Friedberg Heisenberg models for linear chains with exchange coupling constants of -0.47 and -0.51 cm-1 respectively. Magnetic susceptibilities for the Co(II) compound have been compared to values calculated using five different theoretical models. Suitable fits over the range 2 to 80 K were not obtained; however, the data below 30 K agree reasonably well with both Ising and Heisenberg models employing an effective spin S′ = 1 2.
AB - The compounds M(HCONH2)2[H(C6H5)PO2]2 where M = Co (1), Cd (2) and Mn (3) were synthesized and characterized using single crystal X-ray diffraction, differential scanning calorimetry, infrared spectroscopy and magnetic susceptibility (2 to 80 K) studies. The three compounds are isomorphous, their structures consisting of polymeric chains, propagating along the crystallographic b axis, in which two phosphinate ligands form double bridges between adjacent metal atoms. Two formamide molecules are coordinated via oxygen to each metal atom, completing an octahedral geometry. Compounds 1 and 3 are antiferromagnetic exhibiting maxima in their χm versus T plots at 6.3 and 5.8 K respectively. The magnetic data for the Mn(II) compound have been successfully analyzed according to the Weng and Wagner-Friedberg Heisenberg models for linear chains with exchange coupling constants of -0.47 and -0.51 cm-1 respectively. Magnetic susceptibilities for the Co(II) compound have been compared to values calculated using five different theoretical models. Suitable fits over the range 2 to 80 K were not obtained; however, the data below 30 K agree reasonably well with both Ising and Heisenberg models employing an effective spin S′ = 1 2.
UR - http://www.scopus.com/inward/record.url?scp=0039720434&partnerID=8YFLogxK
U2 - 10.1016/S0020-1693(00)80407-7
DO - 10.1016/S0020-1693(00)80407-7
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AN - SCOPUS:0039720434
SN - 0020-1693
VL - 170
SP - 45
EP - 51
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 1
ER -