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Two copper(II) complexes of disubstituted 2,2'-bipyridine (bpy = 2, 2'-bipyridine) with tetraalkylammonium groups, [Cu(L1)2Br](ClO4)5·2H2O (1) and [Cu(L2)2Br](ClO4)5·H2O (2) (L1 = [4, 4'-(Et3NCH2)2-bpy]2+, L2 = [4, 4'-((n-Bu)3NCH2)2-bpy]2+), have been synthesized and characterized. X-ray crystallographic study of 1 indicates that Cu(II) is a distorted trigonal bipyramidal or square pyramid. DNA binding of both complexes was studied by UV spectroscopic titration. In the presence of reducing reagents, the cleavage of plasmid pBR322 DNA mediated by both complexes was investigated and efficient oxidative cleavage of DNA was observed. Mechanistic study with reactive oxygen scavengers indicates that hydrogen peroxide and singlet oxygen participate in DNA cleavage. [ABSTRACT FROM AUTHOR]

Octahedral hexanuclear ferrocenylacetylide complexes [Ag6(μ-dppm)2(μ3-η1-C&z.tbnd6;CFc)4(CH3OH)2](BF4)2 (1) and [Cu6(μ-dppm)2(μ3-η1-C&z.tbnd6;CFc)4(ClO4)2] (2) (dppm=Ph2PCH2PPh2, Fc=ferrocenyl) are synthesised and characterized structurally. [Copyright &y& Elsevier]

There has been tremendous interest in the emissive properties of group 11 alkylnyl complexes. Aiming at attaining photoluminescent Au-Ag heterometallic alkynyl complexes one feasible approach is to incorporate polymenc silver aryl acetylide with binuclear Au components the reaction allows isolation of Au-Ag heterometallic complexes with unprecedented trianion - derived from cyclotrimerization of arylacetylide The trianion displays an unusual μ5-bonding fashion bound to three Au and two Ag centers.

Heterotetranuclear geometrical (Er2Yb2/Yb2Er2) and configuational (EuTb3/Eu3Tb) isomeric lanthanide(III) complexes havebeen synthesizedand characterized by spectroscopy as well as X-ray crystallography.The geometric Er2Yb2/Yb2Er2isomers exhibit dual emissions from both erbium(III) and ytterbium(III)ions. For the EuTb3/Eu3Tb configurational isomers,the TbIIIsubunits transfer energy to the EuIIIcenters in the EuTb3complex, whereas the TbIIIion in the TbEu3complex serves mainly as a structuralstabilizer. [ABSTRACT FROM AUTHOR]