Rotational spectroscopy update for the newly identified atmospheric ozone depleter CF3CCl3

Kisiel, Zbigniew; Pszczółkowski, L.; Białkowska-Jaworska, E.; Jaworski, Marek Adam.; Uriarte, Iciar; Basterretxea, Francisco J.; Cocinero, Emilio J.

doi:10.1016/j.jms.2018.07.005

Cited by 5 publications

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“…It was found that there is a small difference between θ za and the bond axis, but that such difference is easily calculable. This has been used in structural evaluations in several other molecules [18][19][20], as well as in the (HCl) 2 H 2 O cluster [21]. Presently we note that the structural angle θ str = 17.5 • between the ∠(CNC) bisector and the a-principal inertial axis evaluated from the quadrupole information for N r compares well with the angle θ str = 19.2 • from the structure of AMW evaluated in the next section.…”

Section: Hyperfine Coupling Constantssupporting

confidence: 69%

From Molecular to Cluster Properties: Rotational Spectroscopy of 2-Aminopyridine and of Its Biomimetic Cluster with Water

2021

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We report the observation and analysis of the rotational spectrum of a 1:1 cluster between 2-aminopyridine and water (AMW) carried out with supersonic expansion Fourier transform microwave spectroscopy at 4.7–16.5 GHz. Measurements of the 2-aminopyridine monomer (AMP) were also extended up to 333 GHz for the room-temperature rotational spectrum and to resolved hyperfine splitting resulting from the presence of two 14N quadrupolar nuclei. Supersonic expansion measurements for both AMP and AMW were also carried out for two synthesized isotopic species with single deuteration on the phenyl ring. Nuclear quadrupole hyperfine structure has also been resolved for AMW and the derived splitting constants were used as an aid in structural analysis. The structure of the AMW cluster was determined from the three sets of available rotational constants and the hydrogen bonding configuration is compared with those for clusters with water of similarly sized single-ring molecules. Experimental results aided by quantum chemistry computations allow the conclusion that the water molecule is unusually strongly bound by two hydrogen bonds, OH...N and O...HN, to the NCNH atomic chain of AMP with the potential to replace hydrogen bonds to the identical structural segment in cytosine and adenine in CT and AT nucleic acid base pairs.

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