Crystal and Molecular Structure of Four Organic Salts from Benzylamine and Carboxylic Acids

Abstract

Four salts benzylammonium (4-chloro-phenoxy)-acetate monhydrate (1), benzylammonium 3,5-dinitrosalicylate (2), benzylammonium 2,5-bis-benzylcarbamoyl-terephthalate (3), and benzylammonium 4-nitro-phthalate monohydrate (4) were obtained from self-assembly of the corresponding carboxylic acids with the benzylamine, and their structures were fully characterized. All four compounds are ionic, with proton transfer occurring to the NH 2 of the benzylamine moiety. Compound 1 crystallizes in the Monoclinic, space group P2(1)/ n, with a = 6.7577(5) Å , b = 8.3490 (7) Å , c = 28.658(2) Å , b = 95.765(2)°, V = 1608.7(2) Å 3 , Z = 4. Compound 2 crystallizes in the Triclinic, space group P-1, with a = 9.7082(11) Å , b = 10.9970(11) Å , c = 15.9915(17) Å , a = 98.2230(10)°, b = 102.6500(10)°, c = 114.105(2)°, V = 1467.9(3) Å 3 , Z = 4. Compound 3 crystallizes in the Monoclinic, space group P2(1)/c, with a = 15.8100(12) Å , b = 5.6638(3) Å , c = 20.1245(17) Å , b = 106.857(2)°, V = 1724.6(2) Å 3 , Z = 2. Compound 4 crystallizes in the Monoclinic, space group Pc, with a = 17.3360(19) Å , b = 9.4133(8) Å , c = 14.5066(16) Å , b = 112.104(2)°, V = 2193.3(4) Å 3 , Z = 4. Supramolecular architectures of the compounds 1-4 involve O-HÁÁÁO/N-HÁÁÁO/N-HÁÁÁN hydrogen bonds as well as other non-covalent associations. These salts displayed 2D-3D framework structures for the synergistic effect of the various non-covalent interactions.Graphical Abstract The crystal structures of the benzylamine salts with (4-chloro-phenoxy)-acetic acid, 3,5-dinitrosalicylic acid, 2,5-bis-benzylcarbamoyl-terephthalic acid, and 4-nitro-phthalic acid show extensive hydrogen bonding as well as other noncovalent interactions, linking discrete components into higher-dimensional networks.

Supramolecular Assembly of Guanidinium benzilate and Benzylammonium benzilate — Structural and Spectroscopic (FT-IR, UV-Vis and Photoluminescence) Analyses

“…Many synthetic receptors comprising a guanidinium moiety have been designed and studied for their recognition pattern for a wide range of anions [18,19]. As an amine derivative, except the basic NH 2 group, benzylamine has the additional rigid phenyl ring and the somewhat exible CH 2 linker, which can provide more complex noncovalent associations when it associated with the organic acids [20,21].…”