Representation of Electrical Conductances by the Quint–Viallard Conductivity Equation. Part 6. Unsymmetrical 2:1 Type “Complex Ions” Electrolytes: Cadmium Bromide and Cadmium Iodide

2016 ◽  
Vol 45 (8) ◽  
pp. 1130-1145
Author(s):  
Alexander Apelblat
Keyword(s):  
Cadmium Iodide ◽  
Complex Ions ◽  
Conductivity Equation ◽  
Electrical Conductances ◽  
Type Complex ◽  
Cadmium Bromide

scholarly journals Crystal structures of dibromido{N-[(pyridin-2-yl-κN)methylidene]picolinohydrazide-κ2N′,O}cadmium methanol monosolvate and diiodido{N-[(pyridin-2-yl-κN)methylidene]picolinohydrazide-κ2N′,O}cadmium

2017 ◽  
Vol 73 (5) ◽  
pp. 698-701 ◽  
Author(s):  
Ali Akbar Khandar ◽  
Farhad Akbari Afkhami ◽  
Harald Krautscheid ◽  
Kenneth Aase Kristoffersen ◽  
Zeliha Atioğlu ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Complex I ◽  
Room Temperature ◽  
Solvent Molecule ◽  
Tridentate Ligand ◽  
Cadmium Iodide ◽  
Complex Ii ◽  
Pyramidal Geometry ◽  
Cadmium Bromide ◽  
Square Pyramidal Geometry

The title compounds, [CdBr2(C12H10N4O)]·CH3OH, (I), and [CdI2(C12H10N4O)], (II), are cadmium bromide and cadmium iodide complexes of the ligand (E)-N′-(pyridin-2-ylmethylene)picolinohydrazide. Complex (I) crystallizes as the methanol monosolvate. In both compounds, the Cd2+cation is ligated by one O atom and two N atoms of the tridentate ligand, and by two bromide anions forming a Br2N2O pentacoordination sphere for (I), and by two iodide anions forming an I2N2O pentacoordination sphere for (II), both with a distorted square-pyramidal geometry. In the crystal of complex (I), molecules are linked by pairs of N—H...O and O—H...Br hydrogen bonds, involving the solvent molecule, forming dimeric units, which are linked by C—H...Br hydrogen bonds forming layers parallel to (101). In the crystal of complex (II), molecules are linked by N—H...I hydrogen bonds, forming chains propagating along [010]. In complex (II), measured at room temperature, the two iodide anions are each disordered over two sites; the refined occupancy ratio is 0.75 (2):0.25 (2).

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