Complexes of some first-row transition elements with (–)-spartein

Abstract

Complexes of cobalt(l1). nickel(l1). copper(l1). and zinc(l1). of the general formula [M(spartein)X,], where X = CI-, Br-, or I-, have been prepared and characterised. Magnetic moments, electronic spectra, and the circular dichroism absorption (down to 5000 cm-l) of [Ni(sp)CI,] are reported. The electronic structures of the cobalt(l1) and nickel( II) complexes are discussed in terms of an effective C , chromophoric symmetry. Complexes of manganese-(111) and iron(ll1) have been obtained, but are less well characterised.

Reaction Monitoring Using Mid‐Infrared Laser‐Based Vibrational Circular Dichroism

“…The nickel‐(−)‐sparteine chloride complex 1 was synthesized according to the literature . (−)‐Sparteine ( 2 ) was obtained after dissolving (−)‐sparteine sulfate (Fluka, Buchs, Switzerland) in a 100 mM sodium hydroxide solution and extraction with tert ‐butyl methyl ether.…”

“…The nickel-(À)-sparteine chloride complex 1 was synthesized according to the literature. 16 (À)-Sparteine (2) was obtained after dissolving (À)-sparteine sulfate (Fluka, Buchs, Switzerland) in a 100 mM sodium hydroxide solution and extraction with tert-butyl methyl ether. For hydrolysis of 1 a 200 mM solution in CHCl 3 (326 mg in 3 mL) was overlaid with 5 mL of a 200 mM aqueous sodium hydroxide solution in a test tube.…”

Synthesis and spectral characterization of sparteine and α -isosparteine complexes with copper(II) sulfate

“…it is switched on before the cooling starts. Sparteine was obtained from commercial sparteine sulfate C 15 H 26 N 2 Á H 2 SO 4 Á 5H 2 O [23]. CuSO 4 was supplied by Aldrich.…”

DNA as a Catalyst and Catalytic Template for the Racemisation of Metal Tris-Phenanthroline Complexes

“…[Fe(1,10-phenanthroline) 3 ] 2ϩ enantiomeric purity was determined using the literature values of ε 510 nm ϭ 11200 mol Ϫ1 dm 3 cm Ϫ1 and ∆ε 545 nm ϭ 20.0 mol Ϫ1 dm 3 cm Ϫ1 for the ∆ enantiomer. [10] The ∆ enantiomer proved to be 90% enantiomerically pure and the Λ enantiomer 103% (suggesting the literature value for ∆ε is an underestimate).…”