Novel Co(III)/Co(II) mixed valence compound [Co(bapen)Br2]2[CoBr4] (bapen = N,N′-bis(3-aminopropyl)ethane-1,2-diamine): Synthesis, crystal structure and magnetic properties
| Autor: | Jozef Miklovič, Juraj Černák, Roman Boča, Juraj Kuchár, Lukáš Smolko |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Aqueous solution
Valence (chemistry) 010405 organic chemistry Hydrogen bond Organic Chemistry Intermolecular force Inorganic chemistry Ionic bonding Infrared spectroscopy Crystal structure 010402 general chemistry 01 natural sciences 0104 chemical sciences Analytical Chemistry Inorganic Chemistry chemistry.chemical_compound Crystallography chemistry Diamine Spectroscopy |
| Zdroj: | Journal of Molecular Structure. 1119:437-441 |
| ISSN: | 0022-2860 |
| DOI: | 10.1016/j.molstruc.2016.04.081 |
| Popis: | Green crystals of Co(III)/Co(II) mixed valence compound [Co(bapen)Br2]2[CoBr4] (bapen = N,N′-bis(3-aminopropyl)ethane-1,2-diamine) were isolated from the aqueous system CoBr2 – bapen – HBr, crystallographically studied and characterized by elemental analysis and IR spectroscopy. Its ionic crystal structure is built up of [Co(bapen)Br2]+ cations and [CoBr4]2− anions. The Co(III) central atoms within the complex cations are hexacoordinated (donor set trans-N4Br2) with bromido ligands placed in the axial positions. The Co(II) atoms exhibit distorted tetrahedral coordination. Beside ionic forces weak N H⋯Br intermolecular hydrogen bonding interactions contribute to the stability of the structure. Temperature variable magnetic measurements confirm the S = 3/2 behavior with the zero-field splitting of an intermediate strength: D/hc = 8.7 cm−1. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect