Tetrahedron
Tetrahedron
5 years ago

Insight into hydrogen bonding of terephthalamides with amino acids: Synthesis, structural and spectroscopic investigations

Insight into hydrogen bonding of terephthalamides with amino acids: Synthesis, structural and spectroscopic investigations
Several bis-terephthalamides based on methyl esters of amino acids including glycine (1), β-alanine (2), γ-aminobutyric acid (3) and ε-aminocaproic acid (4), X(CH2) n HNOCC6H4 CONH(CH2) n X (XCO2CH3, n = 1, 2, 3 and 5), have been synthesized and characterized by single-crystal X-ray diffraction and spectroscopic methods: FT-IR, polarized FT-IR, Raman, 1H NMR and 13C NMR. The four structures assemble via classical NH⋯O hydrogen bonds between amide functionalities linking the molecules into chains parallel to the short axis. The analysis of polarized IR spectra of pure and deuterated compounds reveals that a weak interchain (“through-space”) exciton coupling involves two closely-spaced hydrogen bonds belonging to two different adjacent chains. The exciton coupling magnitude decreases with the addition of methylene groups to the terephthalamide system. Isotope effects in terephthalamides show that the distribution of protons and deuterons in the crystalline lattice depends on the strength of the exciton couplings involving hydrogen bonds.

Publisher URL: www.sciencedirect.com/science

DOI: S004040201730337X

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