Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Lab, Beijing 100039, Peoples R China
; Beijing Inst Technol, Coll Chem Engn & Mat Sci, Beijing 100081, Peoples R China
; Peking Univ, State Key Lab Rare Earth Mat Chem & Applicat, Beijing 100871, Peoples R China
The atomic structure of a novel rare earth complex consisting of Nd and the sulfur-containing ligand pipdte (C5H10NCS2-) has been studied with extended x-ray absorption fine structure (EXAFS) and x-ray diffraction techniques. The complex of formula Nd(pipdtc)(4)N(CH3)(4) crystallizes in the monoclinic space group P2(1)/n with the following lattice parameters, a = 22.685(2), b = 20.332(2), c = 17.1270(10)degrees, beta = 100.570(10)degrees, Z 8. The calculated density is 1.47 g/cm(3) A new derivative method is used to remove the post-edge absorption background including the multielectron excitation effect. The EXAFS results demonstrate that there are about eight S and four O atoms around Nd with the Nd-S bond length of 2.916 Angstrom and the Nd-O bond length of 2.415 Angstrom, respectively. This implies that the powder of this complex is not stable and is easy to oxidize in air. The possible change of structure before and after oxidation is discussed.