WATER MOLECULE ENHANCES DIPOLE-BOUND ELECTRON-AFFINITY OF 1-METHYL-CYTOSINE

We investigate electron attachment to water complexes of 1-methyl-cyto sine. In all the systems considered the excess electron is bonded to t he dipole field of the complex. The calculations show that in the case s of the amino-oxo tautomer with a water molecule H-bonded to the amin o group and with a water molecule H-bonded to the carbonyl group, enla rgement of the dipole moment due to alignment of the dipoles of the wa ter and base molecules leads to an almost four-fold increase of the el ectron affinity in comparison to the isolated 1-methyl-cytosine molecu le.