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Structure, conformation and contact analyses of six aromatic diamide diesters

Osman, Islam Ali orcid logoORCID: 0000-0002-1326-4203, McKee, Vickie, Jelsch, Christian orcid logoORCID: 0000-0002-2655-0313 and Gallagher, John F. orcid logoORCID: 0000-0003-4130-4556 (2023) Structure, conformation and contact analyses of six aromatic diamide diesters. Crystals, 13 (7). p. 1133. ISSN 2073-4352

Six meta-substituted isophthalamide diesters (DxE) and pyridinedicarboxamides (PxE) are reported with spectroscopic and crystal structure analyses (D = meta-C6H4; P = meta-pyridine; xE = 2-/3-/4-ethyl ester substitution). Comparisons are made between the solid-state and minimised structures from ab initio computational calculations. The six compounds are potentially useful ligands for metal-complex coordination, spanning a range of molecular conformations. D2E adopts a planar molecular structure, as influenced by the C-H· · · O intramolecular interactions with all 34 nonhydrogen atoms within 0.1 Å of the D2E mean molecular plane. Extensive intermolecular ring· · ·ring stacking arises with the shortest interplanar C· · · C of 3.372(2) Å. For D3E (Zprime = 4) and D4E, the hierarchy of intermolecular interactions is the determining factor driving the crystal structure formation with concomitant twinning, as influenced by the weaker interactions. In the pyridine-related P2E, the O1W water molecule (site occupancy = 0.441(5)) forms four hydrogen bonds, as follows: (i) O1W−H· · · O=C, (ii) O1W−H· · · π(arene) and (iii) two aromatic C−H· · · O1W. The meta�and para-substituted PxE•2(H2O) structures (x = 3 or 4) adopt open conformations with pairs of hydrogen-bonded water molecules located in molecular niches between the flanking benzamide ester groups. The Hirshfeld surface, two-dimensional fingerprint plots and contact enrichment ratio were investigated to statistically analyse the different types of intermolecular interactions
Item Type:Article (Published)
Uncontrolled Keywords:amide; crystal structure; conformational analysis; contact analysis; ester; hydrogen bonding; molecular stacking; pyridine; crystal twinning
Subjects:Physical Sciences > Organic chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Publisher:Multidisciplinary Digital Publishers Institute - MDPI
Official URL:https://doi.org/10.3390/cryst13071133
Copyright Information:© 2023 The Authors.
ID Code:28806
Deposited On:24 Jul 2023 10:50 by John Gallagher . Last Modified 24 Jul 2023 10:50

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