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Research of composition and structure of complex Cd(II) tetrafluoroborates with phenylenediamines

“…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 BF 4 ⎯ 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.…”

“…If the рК a of Am values lie in the range of 5…7, the structure of complex bonds can be presented as ML 4 (BF 4 ) 2 . Formation of diverse ligand complexes which internal coordination sphere contains two molecules of organic ligand and two groups of 4 BF − takes place in case of rather strong bases which рК a value exceeds 8 [4].…”

The Maximum Hardness Principle and the Composition of Zn(II) and Cd(II) Tetrafluoroborate Complexes with Nitrogen-Containing Organic Bases

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During the systematic research into the composition, the structure, and the properties of metal tetrafluoroborate complexes with nitrogen-containing organic bases (NOB), it has been found previously [1,2] that an increase in the electron-donor capacity of the organic base is accompanied by a decrease in the number of its molecules involved in the coordination. In the case of highly basic compounds such as morpholine (Mr), benzylamine (BA), tert -butylamine ( t -BA), and piperidine (PP), mixed-ligand complexes [ å( L ) 2 ( BF 4 ) 2 ] are formed.

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“…In the case of highly basic compounds such as morpholine (Mr), benzylamine (BA), tert -butylamine ( t -BA), and piperidine (PP), mixed-ligand complexes [ å( L ) 2 ( BF 4 ) 2 ] are formed. The elucidated dependence is interpreted from the standpoint of Pearson's Hard-and-Soft Acid-Base Principle [2].Since this interpretation is qualitative, a quantitative estimate of the hard/soft characteristics of the complexes [3] was carried out by the Jolly-Perry method based on equalization of the orbital electronegativities and implemented as the ELSA software [4]. This program has now been modified for Windows.…”

“…In the case of highly basic compounds such as morpholine (Mr), benzylamine (BA), tert -butylamine ( t -BA), and piperidine (PP), mixed-ligand complexes [ å( L ) 2 ( BF 4 ) 2 ] are formed. The elucidated dependence is interpreted from the standpoint of Pearson's Hard-and-Soft Acid-Base Principle [2].…”