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38399-21-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 38399-21-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,8,3,9 and 9 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 38399-21:
152 % 10 = 2
So 38399-21-2 is a valid CAS Registry Number.

38399-21-2Relevant articles and documents

Controlling the S1energy profile by tuning excited-state aromaticity

Kotani, Ryota,Liu, Li,Kumar, Pardeep,Kuramochi, Hikaru,Tahara, Tahei,Liu, Pengpeng,Osuka, Atsuhiro,Karadakov, Peter B.,Saito, Shohei

, p. 14985 - 14992 (2020)

The shape of the lowest singlet excited-state (S1) energy profile is of primary importance in photochemistry and related materials science areas. Here we demonstrate a new approach for controlling the shape of the S1 energy profile which relies on tuning the level of excited-state aromaticity (ESA). In a series of fluorescent π-expanded oxepins, the energy decrease accompanying the bent-to-planar conformational change in S1 becomes less pronounced with lower ESA levels. Stabilization energies following from ESA were quantitatively estimated to be 10-20 kcal/mol using photophysical data. Very fast planarization dynamics in S1 was revealed by time-resolved fluorescence spectroscopy. The time constants were estimated to be shorter than 1 ps, regardless of molecular size and level of ESA, indicating barrierless S1 planarization within the oxepin series.

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