4,7,13,16,21,24-Hexaoxa-1,10-diazoniabicyclo[8.8.8]hexacosane Penta(nitrato)lanthanate(III): Synthesis and Crystal Structure

Abstract

A new complex salt, 4,7,13,16,21,24-hexaoxa-1,10-diazoniabicyclo[8.8.8]hexacosane penta(nitrato)lanthanate(III) (H2(Crypt-222)]2+ · [La(NO3)5]2−), is synthesized. Its crystal structure is studied using X-ray diffraction analysis (space group Pbcm, a = 9.517 A, b = 13.358 A, c = 24.585 A, Z = 4; direct method, full-matrix least-squares in the anisotropic approximation, R = 0.039 for 4650 measured independent reflections). The [La(NO3)5]2− complex anion lies on the m plane, and the 2 axis passes through the 2.2.2-cryptand dication with two protonated nitrogen atoms. The coordination polyhedron of the La3+ cation (coordination number 11) is a distorted octahedron with five bifurcated vertices, each containing two O atoms from the same NO3−. ligand. The [La(NO3)5]2− anions are joined into infinite polymer chains along the y axis through the NO3− bridging ligand.