Research of composition and structure of complex Cd(II) tetrafluoroborates with phenylenediamines
DOI:
https://doi.org/10.15276/opu.1.48.2016.17Keywords:
complex tetrafluoroborates, phenylenediamine, coordination, tetrafluoroborate ionAbstract
Borofluoric acid and its various products, for example complex metals tetrafluoroborates, become widely used in electrochemical processes at refinement of metals, when receiving soldering fluxes. An interesting feature of tetrafluoroborate complexes of metals with organic ligands is that in these compounds the BF4- group has various nature of bond. Aim: The aim of this work is to confirm the established earlier dependence between basicity of organic ligand and structure of the coordination sphere of tetrafluoroborate complex. Materials and Methods: By preparative way the complex tetrafluoroborates Cd(II) with isomeric o-, m-, p-phenylenediamine (PD) are synthesized. The composition and the structure of the synthesized complex compounds are defined by series of physical and chemical methods of research. According to results of elemental, titrimetric and nuclear-absorbing analyses and without dependency on way of synthesis for m- and p-isomers the [Cd(PD)4](BF4)2 bindings are implemented. In case of OPD use at synthesis without solvent the [Cd(OPD)2](BF4)2 complex has been received. Results: Measurements results of solutions molar conductivity of bonds in dimethyl formamide demonstrate that complexes are the three-ionic electrolytes of the general structure of [Cd(PD)4](BF4)2, and in case of OPD use – the [Cd(OPD)2](BF4)2. Coordination centers of organic ligands and outer-sphere nature of tetrafluoroborate ion bond are defined by spectroscopy IR. Influence of provision of amino groups in diamine molecule on composition and structure of complexes is noted. Conclusions: The established structure of the coordination sphere of the Cd(II) tetrafluoroborate complexes with isomeric phenylenediamines allows to draw conclusion about their tetrahedral configuration as such structure of coordination node is characteristic for this metal as complexing agent with 4 as coordination number.
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