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Data · dataset · 2025

Replication Data for: H-Tunneling Rotamerization in Glycine Imine

Listed in TUDOdata

Quantum mechanical tunneling governs chemical reactivity at cryogenic temperatures.

Description

Here we present the near-infrared (NIR) light-induced generation of a higher energy conformer of glycine imine and its H-tunneling CO bond rotamerization in solid argon (Ar), para-hydrogen (p-H2), and dinitrogen (N2) at cryogenic temperatures. The tunneling half-life for the CO bond rotamerization highly depends on the host matrix and is approximately 5 h in Ar and 18 h in both p-H2 and N2.

Surprisingly, experiments in p-H2 revealed a much longer half-life than in Ar, possibly due to the formation of a dinitrogen complex. Deuteration of the carboxylic acid group completely inhibits the CO bond D-tunneling rotamerization. We performed Wentzel−Kramers−Brillouin (WKB) and canonical variational transition state theory (CVT) calculations, incorporating multidimensional small curvature tunneling corrections (SCT), using the B3LYP/cc-pVTZ level of theory.

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The gas-phase tunneling half-life is 11 h according to the one-dimensional WKB model and 1 h according to the multidimensional CVT/SCT model, both aligning well with our experimental results. This dataset contains experimental data of IR and NMR spectra published in the manuscript "H-Tunneling Rotamerization in Glycine Imine". Spectra labeled as 'Figure...' are presented in the appropriate figures in the main text or the Supporting Information (SI).

Spectra without this caption were used solely for the assignment of different conformers of glycine imine and do not have corresponding figures. All captions, except for NMR and ATR spectra, follow the structure: compound → IR region → matrix host → process. Here, 365, 282, and 254 nm, as well as OPO, indicate photolysis at the respective wavelengths, while 'tunneling' refers to a resulting spectrum recorded after hours in the dark without an IR filter.

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Chemistry
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Text 75% · Theoretical and computational chemistry 74%
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