Novel magnetic circular dichroism spectra of monoacetyl porphyrins. Structure implications.

✍ Scribed by Yucheng Lu; Arthur Y.L. Shu; Andreas Knierzinger; Peter S. Clezy; Edward Bunneberg; Carl Djerassi

• Book ID: 104217397
• Publisher: Elsevier Science
• Year: 1983
• Tongue: French
• Weight: 240 KB
• Volume: 24
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(00)81947-4

✦ Synopsis

Sumnary: transition

The unexpected observation of a pair of oppositely signed MCD bands within the Qi of monoacetyl porphyrins is related to the existence of equilibria between N-H proton tautomers and/or conformational populations of the acetyl substituent.

Substituent-induced sign variation is a pervasive phenomenon in the MCD spectra of organic molecules.

For porphyrin derivatives, it is particularly well documented for reduced porphy-

In the solid state, one acetyl group of nickel(I1) 2,4-diacetyldeuteroporphyrin IX dimethyl ester is essentially coplanar with the porphyrin ring system whereas the other is rotated out of coincidence by 17".