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Show 31 and benzene transitions will be more the Elu band in enzeneo symbolso'31) tive Platt to associate the and the simply B2u nd Blu respectively. intense bands in the 180-210-mu region will be related to The not labeled (Alternatively we could use the more descrip Thus, example, it would be difficult for 263-, 235-, 200-, and 187-m bands of purine ,276-. 237, 204- and 184'7m bands of cytosine with the B2u(260-m). alu(203.m) and the doubly degenerate Elu(180-m) benzene transitions These bands appear to be related in all the Q presumably are ,.. .. ,..'; transitions which are polarized bases and in the plane of the baseo \ pairs purines and pyrimidines, due to th nonboding electron of the Nand 0 atoms of the bases, also exhibit The itions which are Spectral pyrimidines to 280-m .. ,..*trans plane. to the base studies30,32,33 of various substitutd purines and indicate that the strong region transitionsg polarized perpendicular n is complex absortioD band in the 250- containing the Furthermore the B2u and one or more n studies reveal that a .. ,..* second transition(Blu) in some purine type baes is also located in the same egiono For example the insert of Figure 302 shows tpe solution spectra of purine nucleoside and nucleosideso The a series of 6=substituted 236-m band of purine nucleoside is shift and to merge with the more intense seen purine to red B2u band as we proceed u |
