Cytosine-guanine complex

The authors claim that these associations, which are destroyed in fixed compounds, play an important role in the calculation of Ty.The cases of 1,2,4-triazole-5-thiones 74 [97SA(A)699] and of pyridone dimers 15a-15a and 15a-15b were also studied [96MI(13)65]. (3) The recording of IR spectra in solution at different temperatures to determine the effect of the temperature on Kj-, for instance, in pyrazolinones [83JPR(325)238] and in cytosine-guanine base pairs [92MI(9)881]. (4) The determination of the equilibrium 2-aminopyridine/acetic acid 2-aminopyridinium acetate (see Section III.E) in the acid-base complex was carried out by IR (97NKK100). 

There is a comparatively rich literature on Cu complexes with nucleic acid bases and nucleotides. Mono- and bis-adenine complexes with Cu exhibit N7 coordination (Figure 14)7 as does the bis-guanine complex." With cytosine, both N3 and 02 positions are found to coordinate Cull 80,81 [Cu (NH3)2] has also been observed in square planar geometry bound to... 

Several square planar Pt complexes with bases, nucleosides, and nucleotides have been characterized. A series of guanine-derived complexes have been prepared with both cis- and trani-geometries. These complexes generally show Pt coordination to the N7 position except when that position is blocked and coordination to the N1 position can be observed. In the case of adenine, Pt coordination to both N7 and N1 is feasible. The crystal structure of bis-adenine Pt bound to the N7 position with irans-geometry has been reported. The mono-, bis-, and tris-cytosine Pt complexes all exhibit coordination to the N3 position. " " A number of mixed-base compounds have been prepared. ... 

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