NUCLEIC ACID-Hg(II) ION INTERACTIONS.STRUCTURE OF Hg(II) COMPLEXES WITH 1,3-DIMETHYL-URACIL. Michal Sabat1* Bernhard Lippert2, Felix Zamora2,and Richard D.S.Dixon1, 1Department of Chemistry, University of Virginia, Charlottesville, VA 22901, U.S.A., and 2Fachbereich Chemie, Universität Dortmund, 44221 Dortmund, Germany.
As a part of our study on the Hg(II) ion bonding to the carbon atoms of nucleic acid bases, three complexes of Hg(II) with 1,3-dimethyluracil (1,3-DimeU) have been synthesized and characterized by X-ray crystallography at -120deg.C. All the compounds contain Hg(II) ions bonded to C(5) atoms of 1,3-DimeU with the Hg-C distances ranging from 2.04 - 2.09 Å. Complex I has two 1,3-DimeU rings bound to Hg in a linear fashion. Complex II contains a Hg3O moiety with the O atom bridging three Hg atoms.
Crystal data: (I) (1,3 DimeU)2Hg, orthorhombic, Fdd2, a=14.185(4), b=25.27S(7), c=7.924(2) Å V=2840(2) Å3, Z=8, R=0.020 for 563 reflections with I>3[[sigma]],(I) (II) [((1,3-DimeU)Hg)3O]NO3*2H2O, triclinic, P1, a=13.859(4), b=19.655(6), c=9.879(2) Å, [[alpha]]=95.76(2), ,[[beta]]=96.10(2), [[gamma]]=99.23(2)deg., V=2622(3)Å3, Z=4, R=0.053 for 4535 reflections with I>3[[sigma]](I) (III) 1(1,3-DimeU)Hg(Naph)NO3, (Naph=naphtyridine C8H6N2), triclinic, P1, a=10.735(3), b=10.9l5(2),c=6.966(2)Å, [[alpha]]=104.56(2), [[beta]]=93.88(2), [[gamma]]=79.18(2)deg., V=775.8(4) Å3, Z=2, R=0.048 for 1867 reflections with I>3[[sigma]](I).