Synthesis and crystal structure of Pr(mpo)3(DMSO)2 (Hmpo = 2-mercaptopyridine N-oxide)

A novel rare earth metal complex of 2-mercaptopyridine N-oxide (Hmpo) was synthesized and characterized by single crystal X-ray diffraction, element analysis, and IR spectroscopy. The complex Pr(mpo)₃(DMSO)₂ (Hmpo = 2-mercaptopyridine N-oxide) (DMSO = dimethyl sulfoxide) (C₁₉H₂₄N₃O₅S₅Pr) crystallizes in the triclinic system, space group with lattice parameters a = 9.570(2), b = 9.902(2), c = 15.743(3) Å. = 89.00(3), = 85.54(3), = 62.97(3)°, D_c =1.694 gcm^–3, Mr = 675.62, Z = 2. The coordination number of praseodymium (III) is eight, and its coordination geometry is a somewhat distorted bicapped trigonal prism. Surrounding Pr atom, three five-membered ring planes (Py, O, N, C, S) make dihedral angle of 84.86(7), 75.10(6), and 11.06(9)° respectively. One DMSO molecule is disordered and situated along a twofold axis with half-occupancy (occupation factor, G=0.5).