M. Enamullah
Feb 10, 2010
Citations
0
Influential Citations
4
Citations
Journal
Journal of Coordination Chemistry
Abstract
2,2,2-Tris(diphenylphosphinomethyl)ethane (triphos) coordinates to Co(BF4)2 · 6H2O giving red-violet intermediate [Co(triphos)(S)2](BF4)2 (S = solvent) in THF/EtOH. The addition of an equimolar amount of chiral amino alcohol (L-alaninol, S-2-phenylglycinol, R-1-amino-2-propanol and (±)-2-amino-1-phenyl-ethanol) and Na(OH) into this solution affords the green [Co(triphos)(chiral amino alcoholato)](BF4) complexes. The addition of equimolar Na(BPh4) precipitates the deep green [Co(triphos)(L-alaninolato)](BPh4) (1), [Co(triphos)(S-2-phenylglycinolato)](BPh4) (2), [Co(triphos)(R-1-amino-2-propanolato)](BPh4) (3), and [Co(triphos)((±)-2-amino-1-phenyl-ethanolato)](BPh4) (4) complexes, respectively. The complexes are isolated in good yields and characterized by elemental analysis, IR-, UV-Vis-, 1H-/31P-NMR- and mass-spectroscopy. 1H-/31P-NMR results show the paramagnetic nature of the complexes and magnetic moment values are μexptl(µB) = 3.65 (1), 3.78 (2), 3.82 (3), and 3.71µB (4) in methanol at 25 °C.