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217655-13-5

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217655-13-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 217655-13-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,7,6,5 and 5 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 217655-13:
(8*2)+(7*1)+(6*7)+(5*6)+(4*5)+(3*5)+(2*1)+(1*3)=135
135 % 10 = 5
So 217655-13-5 is a valid CAS Registry Number.

217655-13-5Relevant academic research and scientific papers

Extended conjugation in stilbenylsquaraines

Meier, Herbert,Petermann, Ralf,Dullweber, Uta

, p. 744 - 754 (2011/10/12)

Unsymmetrical 1-aryl-3-stilbenylsquaraines 2a-e and 1,3-bis(stilbenyl)squaraines 3a-c were prepared by CC coupling reactions of the corresponding substituted arenes with derivatives of squaric acid (Schemes 2 and 3). Dialkylamino and alkoxy groups enhance the solubility of these dyes and enlarge the intramolecular charge transfer of these donor-acceptor-donor systems. The extended conjugation of the stilbene units - in comparison with arene building blocks - leads to significant bathochromic shifts in the Vis/NIR absorption spectra.

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