2,2′-Dimethyl-7,7′-(methylenediimino)di-1,8-naphthyridin-1-ium bis(perchlorate)

Abstract

Key indicators: single-crystal X-ray study; T = 113 K; mean (C-C) = 0.005 Å; disorder in solvent or counterion; R factor = 0.060; wR factor = 0.134; data-toparameter ratio = 12.6.In the title salt, C 19 H 20 N 6 2+ Á2ClO 4 À , the two planar 1,8-naphthyridine systems are linked by a methylenediamine group with a dihedral angle of 60.6 (1) between the two systems. The crystal structure involves extensive N-HÁ Á ÁO and C-HÁ Á ÁO hydrogen bonding. Related literature Data collectionBruker SMART CCD area-detector diffractometer Table 1 Hydrogen-bond geometry (Å , ). We thank Henan Agricultural University for the generous support of this study.

Hydrogen bonded supramolecular architectures of organic salts based on 5,7-dimethyl-1,8-naphthyridine-2-amine and acidic compounds

“…This is a salt where the OH groups of 2,4,6-trinitrophenol are ionized by proton transfer to one nitrogen atom (N(2)) of the naphthyridine moieties, which is also confirmed by the bond distance of O(1)AC(11) (1.256(3) Å) for phenolate (1.24 ± 0.01 Å) [24]. In this case the less basic nitrogen atom close to the methyl group is protonated which is similar to the published result [25], but it is different from the compound 1. In the compound, there is one ion pair without solvent molecules, which is well agreement with the micro-analysis results.…”

Five binary supramolecular organic salts constructed from 2-aminoheterocyclic compounds and carboxylic acid derivatives through strong and weak non-covalent interactions

“…5. In this case the less basic nitrogen atom close to the methyl group is protonated which is similar to the published result [31], but it is different from the compounds 1 and 2. There exist two NAHÁÁÁO hydrogen bonds between the oxygen atom of the carboxylate and the amine group (1) interaction, which is similar to the monoanion of maleic acid in forming intramolecular hydrogen bonds [32].…”

Syntheses and structure characterization of four inorganic–organic hybrid solids based on N-containing aromatic Brønsted bases and chlorometallates

“…with the NH þ on the naphthyridine rings in 2 resembles 2-amino-4,6-dimethylpyridinium cations [28]. Similar to the organic salt 2,2 0 -dimethyl-7,7 0 (methylenediimino)di-1,8-naphthyridin-1-ium bis(perchlorate) [29], the less basic ring N has been protonated. The coordination geometry around Cd(II) is a distorted tetrahedron with four chlorides.…”