Synthesis, Characterization, and Structure of Metal(II) (-)-Sparteine Complexes Containing Acetate Ligands

Mass Spectrometry of Metal Complexes of Bis-Quinolizidine Alkaloids: Electron Ionization and Fast Atom Bombardment Mass Spectral Study of Copper(II) (–)-Sparteine and (–)-α-Isosparteine Complexes

“…the formation of complexes with transition metal(II) leads to a conversion of the nitrogen atom configuration in the sparteine ligand: as a consequence, all four alkaloid rings adopt the chair configuration and the configuration at the A/B and c/D ring junctions are trans and cis, respectively. [19][20][21][22][23][24]26,27 this conformation differs from that of the free (-)-sparteine ligand. 32,33 on the other hand, it has been reported that (-)-a-isosparteine remains structurally unchanged upon complexation 25,28 (figure 2).…”

“…considerable effort has been devoted to the study of these compounds by infrared and nuclear magnetic resonance spectroscopy, as well as by X-ray methods. [18][19][20][21]23,24,[26][27][28][41][42][43][44][45] However, the EI and fAB fragmentations of these compounds have not been reported.…”

“…46 the stability of these complexes is inversely related to the metal-ligand bond distances. 23 there is also a relationship to the values of the dihedral angle between the N-metal-N and X-metal-X (X = cl, Br, Hcoo, cH 3 coo, ScN) planes, as well as the steric effects of the ligand and the coordinating anion. the factors responsible for the relationships in the EI and fAB fragmentations of these complexes are connected with the localization of the charge on the metal ions, the valence and the coordination state of the metal atom and the spacing between the ligands and the metal atom.…”

“…the goal of this study was to establish if is its possible to differentiate transition metal(II) of zinc(II) and copper(II) dichloride (dibromide, diacetate) complexes of (-)-sparteine and (-)-a-isosparteine from their EI and fAB mass spectra. 1,[18][19][20][21]23,24 this problem has not been discussed previously in the literature.…”

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

“…Cu(II) sparteine complexes have been used as model compounds for the type I copper(II) site of blue copper protein. Complexes of this kind have been reported with a pseudo-tetrahedral metal ion environment [16][17][18]. Owing to our interest in sparteine and -isosparteine complexes [19][20][21][22], we have undertaken a project aimed at characterizing the spectral, analytical and structural properties of copper(II) complexes of (À)-sparteine and -isosparteine.…”