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Effect of alkyl substitution on H-bond strength of substituted amide-alcohol complexes

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The effect of alkyl substitution (CH3, C2H5, n-C3H7, i-C3H7, and t-C4H9) on the hydrogen bond strengths (H-bond) of substituted amide-alcohol complexes has been systematically explored. B3LYP/aug-cc-pVDZ method was applied to a total of 215 alkyl substituted amide-alcohol complexes to delineate the effect of substitution on the H-bond strength; formamide-water complex is taken as reference point. Complexes are classified into five types depending on the hydrogen donor, acceptor and the site of alkyl substitution (Type-IA, Type-IIA, Type-IB, Type-IIB and Type-III). The strength of H-bond was correlated with geometrical parameters such as proton-acceptor (H∙∙∙∙Y) distance, the length of proton donating bond (X–H). In all the complexes N–H and O–H stretching frequencies are red-shifted. The effect of alkyl substitution on N–H and O–H stretching frequencies were analyzed. Topological parameters like electron density at H∙∙∙∙Y and X–H bond critical points as derived from atom in molecules (AIM) theory was also evaluated. When C = O group is participating in H-bond, the strength of H-bond decreases with increasing size of alcohols except for methanol (Type-IA, Type-III and Type-IB complexes). But it increases with increasing size of alkyl groups on amide and decreases with bulky groups. In the case of N–H group as H-bond donor, the strength of H-bond increases with increasing size of alcohols (Type-IIA and Type-IIB complexes) whereas decreases with increasing size of alkyl groups on amide. Type-IA, IIA, IB and IIB complexes exhibit good correlations among IE, H-bond distance and electron density at bcp. In Type-III complexes, average H-bond distance and sum of electron densities shows better correlation with IEs than the corresponding individuals. The correlation of IE less with electron density at RCP compared to sum of electron densities.

Effect of alkyl substitution on H-bond strengths of substituted amide-alcohol complexes

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  1. Molecular Modeling Group, Organic Chemical Sciences-I, Indian Institute of Chemical Technology, Tarnaka, Hyderabad, 500 007, AP, India

    M. Nagaraju & G. Narahari Sastry

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  1. M. Nagaraju
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  2. G. Narahari Sastry
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Correspondence to G. Narahari Sastry.

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Nagaraju, M., Narahari Sastry, G. Effect of alkyl substitution on H-bond strength of substituted amide-alcohol complexes. J Mol Model 17, 1801–1816 (2011). https://doi.org/10.1007/s00894-010-0886-2

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