By T. Kimura, U. Weser, C. E. Schaffer, S. Ahrland, W. Strohmeier
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Extra resources for Structure and Bonding, Volume 5
2 . . . . -- . . 6 . 7 . 2 2,6-diaminopurine . Co lgfl . . . . . 2. Structural Considerations In general the pyrimidines show a much lower reactivity towards the metal ions. Apparently no reaction was observed with uracil while the stability constants of Cu-cytosine are even lower than the lgK1 and lgK2 values of Cu(NH3)~ 2+ (79). The high stability of the purine metal complexes can be attributed to the binding site at the imidazole residue. There the imino proton competes with the metal ion.
48 48 46 4. 1. 2. M e t a l B i n d i n g to N u c l e o s i d e s . . . . . . . . . . . . . . . . . . 47 Stability Constants ............................................. S t r u c t u r a l A s p e c t s of M e t a l N u c l e o s i d e s . . . . . . . . . . . . . 47 48 5. R e a c t i v i t y of N u c l e o t i d e s w i t h M e t a l I o n s . . . . . . . . . . . . 48 6. 1. 2. 1. I n t e r a c t i o n s of T r a n s i t i o n M e t a l I o n s w:~th P o l y n u c l e o t i d e s .
4 (8, 70) 4 Structure and Bonding, Vol. M2+--O~P,~_ H (~H-- - O.. i ~ / ~ Oe / ~ ' O __p/ R/O/@~'0 Fig. 5 (6) 49 U. Weser is expected to yield the intermediate species. These two structures have been elucidated experimentally. However, an example of the third type of complex is still lacking. A plain metal ring complex might be obtained with Ag + or Hg +. These cations have a low electrostatic charge but strong chelating tendencies. In the following figures a variety of possible structures of metal complexes are discussed.
Structure and Bonding, Volume 5 by T. Kimura, U. Weser, C. E. Schaffer, S. Ahrland, W. Strohmeier