Abstract
Cytosine complexes with nitrosonium ion were studied by the RI-MP2/L1 method. Addition of nitrosonium ion to cytosine tautomers leads to formation of a set of nitrosonium complexes with different structures (1η–3η). n-Complexes formed via NO+ coordination to the nitrogen and oxygen atoms are energetically more favorable than π-complexes. The complex of cytosine as 4-aminopyrimidin-2(1H)-one tautomer with nitrosonium ion coordinated to the carbonyl oxygen atom occupies the global minimum on the potential energy surface. Structural features of the complexes are discussed.
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