David G. Calatayud - Structural trends in divalent benzil bis(thiosemicarbazone) complexes

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  Publication Details (including relevant citation   information):

  Calatayud, D G, Lopez-Torres, E, Mendiola, M A, Pastor, C J,   Procopio, J R European Journal of Inorganic Chemistry  2005 (21) 4401-4409

  Abstract: Redox-related changes in the   biological properties of copper bis(thiosemicarbazones) are   induced by the backbone of the ligand. To get information about   how these changes depend on the structural parameters, three   X-ray structures of complexes with different behaviour of the   benzil bis(thiosemicarbazone) ligand have been determined. These   include two almost planar copper(II) complexes with different   grades of deprotonation in the ligand and a ZnII complex in which   the ligand acts as a monoanion and a nitrate group is bonded to   the metal ion in a square-based pyramid. The changes in the   backbone bond lengths agree with the variation in the ionic   radius and with the grade of electronic charge delocalisation in   the chelate rings; these have consequences for the coordination   sphere, allowing the metal to fit slightly better into the ligand   cavity, which in turn may affect the complex stability and the   redox potential.

  Address (URL): ISI:000233297800019