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

A. N. Chekhlov

Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia

Received March 6, 2007

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 Å, b = 13.358 Å, c = 24.585 Å, 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
2.2.2cryptand 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 ligand. The [La(NO₃)₅]² anions are joined into infinite polymer chains along the y axis
through the bridging ligand.

DOI: 10.1134/S003602360807022X

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