Abstract
Treatment of N,N-bis-(pyridin-4-ylmeth-yl)cyclo-hexane-1,4-di-amine with hydro-chloric acid in ethanol led to the formation of the title salt, C18H26N42+·2Cl-·2H2O, which lies about a crystallographic inversion center at the center of the cyclo-hexyl ring. The asymmetric unit therefore comprises one half of the N,N-bis-(pyridin-4-ylmeth-yl)cyclo-hexane-1,4-di-ammonium dication, a chloride anion, and a solvent water mol-ecule. In the dication, the two trans-(4-pyridine)-CH2-NH2- moieties occupy equatorial sites at the 1- and 4-positions of the central cyclo-hexyl ring, which is in a chair conformation. The terminal pyridine ring is tilted by 27.98 (5)° with respect to the mean plane of the central cyclo-hexyl moiety (r.m.s. deviation = 0.2379 Å). In the crystal, dications, anions, and solvent water mol-ecules are connected via N/C/O-H⋯Cl and N-H⋯O hydrogen bonds together with C-H⋯π inter-actions, forming a three-dimensional network.
Highlights
Treatment of N,N-bis(pyridin-4-ylmethyl)cyclohexane-1,4-diamine with hydrochloric acid in ethanol led to the formation of the title salt, C18H26N42+2Cl2H2O, which lies about a crystallographic inversion center at the center of the cyclohexyl ring
Our group has focused on the search for extended dipyridyltype ligands with a bulky central section for the development of metal–organic frameworks (MOFs) with intriguing topologies or useful properties
As a part of our ongoing efforts, we prepared just such a dipyridyltype ligand with a central cyclohexyl moiety, namely N,Nbis(pyridin-4-ylmethyl)cyclohexane-1,4-diamine, synthesized by a condensation reaction between 1,4-cyclohexanediamine and 4-pyridinecarboxaldehyde according to a literature procedure (Huh & Lee, 2007)
Summary
An enormous number of metal–organic frameworks (MOFs) have been developed over the last two decades because of their attractive topologies and their desirable applications in a wide range of fields (Silva et al, 2015; Furukawa et al, 2014). For the development of these MOFs, many chemists have designed and prepared various dipyridyl-type ligands Our group has focused on the search for extended dipyridyltype ligands with a bulky central section for the development of MOFs with intriguing topologies or useful properties. As a part of our ongoing efforts, we prepared just such a dipyridyltype ligand with a central cyclohexyl moiety, namely N,Nbis(pyridin-4-ylmethyl)cyclohexane-1,4-diamine, synthesized by a condensation reaction between 1,4-cyclohexanediamine and 4-pyridinecarboxaldehyde according to a literature procedure (Huh & Lee, 2007). We report on the crystal structure of the title salt obtained by the protonation of both amine groups in this molecule. A view of the molecular structure of the title salt with the atomnumbering scheme. Polymer built up from alternate CoII ions and the dication of the title salt (Lee & Lee, 2010)
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