Electronic properties and stereochemistry of the copper(II) ion. Part VII. Mono(diethylenetriamine)copper(II) complexes

Abstract

The electronic, e.s.r., and i.r. spectra of a series of polycrystalline Cu(dien)XY,zH,O and Cu(dien) PX, type complexes are reported, where X and Y are various anions and p = ammonia, ethylenediamine, 2,2'-bipyridyl, and diethylenetriamine. From a correlation of the three types of spectral data a tentative prediction is made of the local molecular copper( 11) ion environment present in the different complexes. Colchester, EssexPREVIOUS papers have attempted to show a relationship between the electronic properties and the stereochemistry of the local molecular environment of the copper (11) ions present in copper (11) complexes involving nitrogen donor ligands, such as ammoniaJ2 ethylene-diarnir~e,~ and 2,2'-bipy15dyl.l.~ The present paper describes the properties of the mono(diethy1enetriamine)-copper (11) complexes. The ligand diethylenetriamine, C,H,,N, (hereafter referred to as dien) Figure IA may act as a mono-, bi-, or tri-dentate nitrogen

Synthesis, spectral characterization and crystal structure of copper(II) complexes of 2-benzoylpyridine-N(4)-phenylsemicarbazone

“…Calculated G valued of the complexes 1 and 5 are found to be less than 4 and reveals with considerable exchange interaction. In all the polycrystalline complexes, g || > g \ > 2.0023 which is consistent with a d x 2 Ày 2 ground state in a square planar or square pyramidal geometry [32,33]. Although the compounds 3, 5 and 7 show axial nature in polycrystalline state, they show rhombic symmetry in the solution at 77 K. All the EPR spectra of the samples in DMF solution at 77 K were simulated using EasySpin package [34].…”

Metal–N-saccharide chemistry: synthesis and structure determination of two Cu(II) complexes containing glycosylamines

“…This absorption pattern, a broad main band with a lower-energy shoulder, has often been observed for square-pyramidal copper(II) complexes. 12 Single-crystal X-ray studies. The molecular structure of the complex [Cu(N,N 0 ,N 00 -(D D -Glc) 3 -tren)Cl]Cl is shown in Figure 1, Figure 2 is the unit cell of the crystal structure of 1.…”

Synthesis and Characterization of N3s2 Donors Macrocyclic Copper(ii) Complexes. Catechol Oxidase and Phenoxazinone Synthase Biomimetic Catalytic Activity.

“…However, the solid state EPR spectra of these complexes, recorded at ambient temperature were found to be anisotropic with g-values, g || = 2.2040 -2.2748 and g ⊥ = 2.0326 -2.0425 (Table 6). The spectra are axial in nature and g || > g ⊥ > 2.0023, indicating that dx 2 -y 2 is the ground state, which is characteristic of a distorted octahedral geometry [38]. The value of g || is greater than g ⊥ (Table 6) indicating a tetragonal distortion, corresponding to elongation along the four-fold symmetry Z axis.…”