1092 J.C.S. CHEM. COMM., 1979 Photo-C.I.D.N.P.in Nucleic Acid Bases and Nucleotides By ROBERT KAPTEIN,* KLAAS NICOLAY, and KLAAS DIJKSTRA (Physical Chemistry Laboratory, Un.iversity of Groningen, Nijenborgh 16, 9747 AG Groningen, The Netherlands) Summary Photo-C.I.D.N.P. (chemically induced dynamic FLAVIN-SENSITIZED photo-C.I.D.N.P. (chemically induced dynamic nuclear polarization) has previously been observed in the 360 MHz n.m.r. spectra of the amino-acids tyrosine, histidine, and tryptophan.192 This effect can be used to nuclear polarization) is generated in nucleic acid bases (purines and pyrimidines) and in purine nucleotides in a cyclic reaction with a photo-excited flavin. Published on 01 January 1979. Downloaded by TECHNISCHE UNIVERSITEIT EINDHOVEN on 01/02/2014 19:57:53. View Article Online / Journal Homepage / Table of Contents for this issue