Nine supramolecular assemblies from 5,7-dimethyl-1,8-naphthyridine-2-amine and carboxylic acids by strong classical H-bonds and other noncovalent associations

Crystal structure of 2-(1H-indol-3-yl)ethan-1-aminium 2-(4-acetylphenoxy)acetate, C20H22N2O4

C20H22N2O4, monoclinic, P21/c (no. 14), a = 18.1092(12) Å, b = 8.4026(6) Å, c = 11.6983(8) Å, β = 92.582(7)°, V = 1778.3(2) Å3, Z = 4, R gt(F) = 0.0456, wR ref(F 2) = 0.1137, T = 200.00(10) K.

Supramolecular networks and Hirshfeld surfaces of oxydiacetic acid and iminodiacetic acid salts

Oxydiacetic acid (Oda) and iminodiacetic acid (Ida) have been combined with two diamines, namely ethylenediamine (en) and o-phenylenediamine (o-phen), to give three molecular crystals of compositions [(Oda^2-)(en²⁺)]·H₂O (Odaen), [(Ida^-)(0.5en⁺)] (Idaen) and [(Oda^-)(o-phen⁺)] (Odaophen). Single crystal X-ray structure determination of the three molecular salts revealed that the hydrogen bonding interactions form distinct supramolecular chains. In Odaen, water molecules and Oda^2- anions generate one-dimensional supramolecular chains where two chains overlap each other in zigzag form. In Odaophen, Oda^- anions generate a one-dimensional linear supramolecular chain. In Idaen, both intermolecular and intramolecular proton transfer occurs. Ida^- anions generate a one-dimensional zigzag chain. These one-dimensional supramolecular chains extend to form different two-dimensional supramolecular chains by the interaction of diaminium and monoaminium cations. Intermolecular close contacts are also examined using Hirshfeld analysis to reveal similarities and differences in the crystal structures.