Abstract
The title salt, C18H26N42+·2Cl-, was obtained by the protonation of N,N-bis-(pyridin-4-ylmeth-yl)cyclo-hexane-1,4-di-amine with hydro-chloric acid in ethanol. The asymmetric unit consists of one half of an N,N-bis-(pyridin-3-ylmeth-yl)cyclo-hexane-1,4-di-ammonium dication, with a crystallographic inversion centre located at the centre of the cyclo-hexyl ring, and a chloride anion. The central cyclo-hexyl ring in the dication adopts a chair conformation. The two trans-(4-pyridine)-CH2-NH2- moieties at the 1- and 4-positions of the central cyclo-hexyl ring occupy equatorial sites. The terminal pyridine ring is tilted by 53.72 (6)° with respect to the mean plane of the central cyclo-hexyl ring (r.m.s. deviation = 0.2413 Å). In the crystal, N+-H⋯Cl- hydrogen bonds between the dications and the chloride anions, and π-π stacking inter-actions between the pyridine rings of the dications afford a two-dimensional sheet extending parallel to the ab plane. These sheets are further connected through weak C-H⋯Cl- hydrogen bonds, resulting in the formation of a three-dimensional supra-molecular network.
Highlights
As an extension of our research, we have prepared a dipyridyl-type ligand with central cyclohexyl ring and 3-pyridine terminal groups, namely
We report on crystal structure of the title salt obtained by the protonation of both amine groups in this molecule
N+–H Cl hydrogen bonds, Table 1, between the dications and the chloride anions lead to the formation of chains along the b axis
Summary
Several dipyridyl-type ligands with or without a central section between the terminal pyridine rings have contributed greatly to the development of metal–organic coordination polymers with intriguing topologies or potential applications (Silva et al, 2015; Furukawa et al, 2014; Robin & Fromm, 2006; Robson, 2008; Leong & Vittal, 2011). Our group has tried to prepare extended dipyridyl-type ligands with a bulky central moiety for the construction of versatile coordination polymers. We prepared the dipyridyl-type ligand containing 4-pyridine terminal groups and a cyclohexyl ring as a bulky central moiety, namely N,N-bis(pyridin-4-ylmethyl)cyclohexane-1,4-diamine, and reported the crystal structure of its chloride salt (Moon et al, 2016). As an extension of our research, we have prepared a dipyridyl-type ligand with central cyclohexyl ring and 3-pyridine terminal groups, namely. We report on crystal structure of the title salt obtained by the protonation of both amine groups in this molecule
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