Abstract
Meso-5,7,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane (tet-a) — (2E)-2-cyano-2-(hydroxyimino) acetamide (caH) (1:4) (1) is a salt [tet-aH2]2+ ·2[caH]· 2[ca]− containing both neutral and deprotonated acetamide units. The acetamide units of the two types are linked by NH⋯O and OH⋯O hydrogen bonds into negatively charged chains; the chains are connected by the macrocyclic cations to form H-bonded ribbons. Tet-a and 2-(2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)hydrazinecarboxamide (urH) form a salt of 1:2:2 stoichiometry, [tet-aH2]2+·2[ur]−·2H2O (2). In (2), the deprotonated ur− units form a negatively charged 2D network substructure, and the layers are linked by the cations and water molecules to form a 3D framework. The tetraazamacrocycle shows different modes of the protonation of amine functionalities that depend on a substrate.
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Abbreviations
- Tet-a:
-
Meso-5,7,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane
- cyclen:
-
1,4,7,10-tetraazacyclododecane
- cyclam:
-
1,4,8,11-tetraazacyclotetradecane
- azacyclam:
-
1,4,6,8,11-pentaazacyclotetradecane
- caH:
-
(2E)-2-cyano-2-(hydroxyimino)acetamide
- urH:
-
2-(2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)hydrazinecarboxamide
- 18C6:
-
18-crown-6
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Original Russian Text Copyright © 2005 by M. S. Fonari, Yu. A. Simonov, Yu. M. Chumakov, E. V. Ganin, A. A. Yavolovskii, G. Bocelli, and M. M. Botoshansky
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Translated from Zhurnal Strukturnoi Khimii, Vol. 46, Supplement, pp. S95–S101, 2005.
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Fonari, M.S., Simonov, Y.A., Chumakov, Y.M. et al. 1D and 3D supramolecular architectures in the salts of Meso-5,7,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane with (2E)-2-cyano-2-(hydroxyimino)acetamide and 2-(2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl) hydrazinecarboxamide sustained by charge-assisted and conventional hydrogen bonds. J Struct Chem 46 (Suppl 1), S96–S102 (2005). https://doi.org/10.1007/s10947-006-0158-2
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DOI: https://doi.org/10.1007/s10947-006-0158-2