A 2-DIMENSIONAL MANGANESE(II) CARBOXYLATO POLYMER - STRUCTURE, MAGNETISM, AND EPR STUDY

The synthesis, crystal structure, and properties of [M(Pi)(MCPA)(2)(H2 O)(2)](n) (MCPA = 2-methyl-4-chlorophenoxyacetic acid), 1, a 2-D manga nese carboxylato polymer is reported. The synthesis of 1 has been achi eved via the reaction of MCPA with MnCl2 . 2H(2)O and NaHCO3 in methan ol. Crystal structure data: [C18H2OCl2O8Mn]; orthorhombic; space group Pbca; a = 7.811(6) Angstrom; b = 34.67(3) Angstrom; c = 7.481(6) Angs trom; Z = 4. The compound has a two-dimensional structure with Mn2+ at oms in an octahedral environment and mixed water/carboxylate coordinat ion. The metal atoms are segregated in planes which are perpendicular to the b axis and are spaced 17.73 Angstrom apart. Variable-temperatur e magnetic susceptibility measurements indicate the presence of antife rromagnetic behavior. The EPR spectra of polycrystalline samples at 4 K show that the intensity of the signal decreases significantly with d ecreasing temperature and below similar to 4 K becomes EPR silent.