Synthesis and characterization of some new phenyl hydrazinium rare earth(III) dipicolinates hydrates: Crystal and molecular structure of lanthanum complex

B. Subramani1 and R. Wilfred S

Abstract

Several new phenyl hydrazinium Ln(III) pyridine-2,6-dicarboxylate hydrates have been synthesized in aqueous medium and characterized by metal and elemental analyses, UV-visible and infrared spectra, thermal analyses, Xray powder diffraction and X-ray single crystal techniques. The LaIIIN3O6 part in the complex anion has a ninecoordinated structure in which the nine coordinated atoms (three N and six O) from three pyridine-1,6- dicarboxylate ions are coordinated to the central rare earth metal ion directly. The crystal of the lanthanum complex belongs to the trigonal crystal packing system with p-3 space group. The crystal data are: a=16.4870(3) Å, b=16.4870(3) Å, c=9.2900(2) Å, α=β=90o and γ=120o, V=2186.90(7) Å3. The final R and Rw are 0.0338 and 0.0799 for reflection 2581 with [I> 2σ (I)]. The volume and calculated density of the crystal are 2186.90(7) Å and 1.562 mg/m3