International Research Journal of Pure and Applied Chemistry

Heterometallic f/s-block complexes are not plentiful but play pivotal roles in understanding metal synergy in materials science and catalysis. Reaction of Y(NO₃)₃.6H₂O with EDTANa₂.2H₂O (ethylenediaminetetraacetic acid, disodium salt dihydrate) gives the dodecanuclear {Y₄Na₈(L)₄(OH)₂(NO₃)₂(H₂O)₁₆} (1). Complex (1) is characterized by elemental analyses, IR and conductance measurement. The structure of (1) was elucidated by X-ray diffraction analysis. The compound crystallizes in the monoclinic space group P2₁/c with the following parameters: a = 24.81289 (15) Å, b = 15.63590 (8) Å, c = 19.68764 (14) Å, = 106.6623 (7)°, V = 7317.53 (8) ų, Z= 4, R₁ = 0.041, wR₂ = 0.117. The asymmetric unit of the compound contains four tetradeprotonated (L^4-) EDTA molecules, four octacoordinated yttrium ions, three pentacoordinated sodium ions, five hexacoordinated sodium ions, two chelating nitrate groups, two hydroxy groups acting in \(\mu\)₂-mode, seven coordinated water molecules acting in \(\eta\)^1-mode and nine coordinated water molecules acting in \(\mu\)₂-mode. Each of the Y^III cations is coordinated by one fully deprotonated EDTA which link also four Na^I cations. Each of the NO₃^- anions bridge two Y^III ions, while each of the two hydroxy groups bride one Y^III cation and one Na^I cation. The environment around the octacoordinated Y^III cations are best described as a square antiprisms. The environments around the pentacoordinated Na^I ions are best described as a square pyramidal geometries, while the hexacoordinated Na^I ions exhibit octahedral environments. The molecule features a typical 3D hydrogen-bonded network with diverse coordination geometries (square antiprismatic Y³⁺, square pyramidal/octahedral Na⁺).