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Synthesis and crystal structure of 4,7,13,16,21,24-hexaoxa-1,10-diazoniabicyclo[8.8.8]hexacosane bis(hydrogen oxalate)

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Abstract

A crystalline salt of 2.2.2-cryptand and oxalic acid, 4,7,13,16,21,24-hexaoxa-1,10-diazoniabicyclo[8.8.8]hexacosane bis(hydrogen oxalate), [H2(Crypt-222)]2+·2(C2HO4)−, was synthesized and studied by single crystal X-ray diffraction. In the crystal structure of this salt, the 2.2.2-cryptand cation has a rare conformation of the exo-exo type in which the H atoms at the two protonated N atoms are oriented outside the cryptand cavity. The geometric parameters (bond lengths, bond angles, torsion angles) of the [H2(Crypt-222)]2+ cation and two independent C2HO −4 anions were found with a fairly high accuracy, and the crystal packing was determined. These ions are linked by interionic hydrogen bonds to form thick infinite layers parallel to the (xz) plane.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, pr. Akademika Semenova 1, Chernogolovka, Moscow oblast, 142432, Russia

    A. N. Chekhlov

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  1. A. N. Chekhlov
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Correspondence to A. N. Chekhlov.

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Original Russian Text © A.N. Chekhlov, 2008, published in Zhurnal Obshchei Khimii, 2008, Vol. 78, No. 8, pp. 1289–1293.

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Chekhlov, A.N. Synthesis and crystal structure of 4,7,13,16,21,24-hexaoxa-1,10-diazoniabicyclo[8.8.8]hexacosane bis(hydrogen oxalate). Russ J Gen Chem 78, 1524–1528 (2008). https://doi.org/10.1134/S1070363208080100

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  • DOI: https://doi.org/10.1134/S1070363208080100

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