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97946-28-6

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97946-28-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 97946-28-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,7,9,4 and 6 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 97946-28:
(7*9)+(6*7)+(5*9)+(4*4)+(3*6)+(2*2)+(1*8)=196
196 % 10 = 6
So 97946-28-6 is a valid CAS Registry Number.

97946-28-6Relevant articles and documents

Photoresponsive Crown Ethers. Part 14. Photoregulated Crown-Metal Complexation by Competitive Intramolecular Tail(Ammonium)-biting

Shinkai, Seiji,Ishihara, Midori,Ueda, Kaori,Manabe, Osamu

, p. 511 - 518 (2007/10/02)

New photoresponsive crown ethers (1H+) having a crown ether ring and an ammoniumalkyl +-(CH2)n, n = 4,6,10> group attached to the two sides of an azobenzene have been synthesized.These photoresponsive 'tail-biting' crown ethers have been designed so that intramolecular 'biting' of the ammonium group to the crown can only occur upon photoisomerisation to the cis-forms.In the thermal cis-trans isomerisation, the first-order rate constants for cis-(1H+) were smaller by 1.6 - 2.2 -fold than those for (1) (the analogous free amines).Moreover, this rate increased with increasing added K+ concentration.This suggests that the ammonium tail is intramolecularly bound to the crown ether ring in cis-(1H+).This intramolecular 'biting' is further reflected in the relative affinities of (1H+) for alkali-metal cations.The affinities were markedly reduced by u.v.-light irradiation and in particular, cis-(1H+)(n=6) and cis-(1H+)(n=10) showed almost no metal-binding ability.This marked difference in the metal-binding ability was used to generate the light-controlled systems for the passive or active ion-transport of ions across a liquid membrane.

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