Synthesis, crystal structure, weak antiferromagnetic behavior and electronic studies of novel [((−)-sparteine)(PhCO2)(Cl)]Cu(II) complex

Beyond excitation NMR relaxation

“…Therefore, the chemical shifts for [((2)-sparteine)(PhCO 2 )(Cl)]Cu(II) appear between 37 and 221 ppm, and the integration of the spectrum is fully consistent with 31 protons, as expected for this compound (see Scheme 13) (126).…”

Crystal structure, spectroscopy and ferromagnetostructural behavior of the complex [CuII(L)(Cl)(L´)]•H2O (L = 2-aminomethylbenzimidazole, L´= L-isoleucinate)

“…The apical site is occupied by the chlorine atom, with a long Cu-Cl bond length (Table 2), characteristic of these structures. [17][18][19][20] The angle between the normal to the basal plane N12/O15/N3/N11 and the line Cu-Cl is 3.7°. These features suggest that the covalency of the O and N atoms towards Cu II is very similar to each other ( Table 2 -compounds reported, the Gaussian functions number expected for square pyramidal structure, would be three, corresponding to d x 2-y 2←d z 2, d x 2-y 2←d xy , d x 2-y 2←d xz , d yz , transitions.…”

Variety of polymorphic forms contrasted with uniform crystal packing in sparteine ML2 complexes: Crystal structure, spectroscopic and magnetic properties of (−)-α-isosparteine and (−)-sparteine complexes with CuBr2

“…Copper halide compounds have been the subject of many structural and magnetic studies [4][5][6][7][8][9][10][11]. Electronic and magnetic properties of such compounds have been analyzed in order to establish relationship with their structural features [6][7][8][9][10][11].…”

“…Electronic and magnetic properties of such compounds have been analyzed in order to establish relationship with their structural features [6][7][8][9][10][11]. Among them there are distorted tetrahedral copper(II) (À)-sparteine complexes.…”

“…Among them there are distorted tetrahedral copper(II) (À)-sparteine complexes. There are reports of weak anti-ferromagnetic behavior characteristic for (À)SpCuBr 2 [8], (À)SpCu(PhCOO)Cl [10] and (À)SpCu(Ph-COO)Br [12] complexes. In view of the antiferromagnetic interactions in the copper(II)-halide systems, hydrogen bonding and short Cu-X ... X-Cu contacts were considered as possible pathways for magnetic exchange [13][14][15][16].…”