Copper(II)-oxime complexes: A structural and spectroscopic study for a diamine dioxime ligand

1972 ◽  
Vol 25 (4) ◽  
pp. 747 ◽  
Author(s):  
JW Fraser ◽  
GR Hedwig ◽  
HKJ Powell ◽  
WT Robinson
Keyword(s):  
Spectroscopic Study ◽  
Absorption Spectra ◽  
Stability Constants ◽  
Electronic Absorption ◽  
Copper Atom ◽  
Electronic Absorption Spectra ◽  
Coordination Environment ◽  
Magnetic Susceptibilities ◽  
X Ray ◽  
Trigonal Bipyramidal

The preparations are reported for copper(11) complexes with the ligand 4,4,9,9-tetramethyl-5,s-diazadodecane-2,l-dione dioxime, LH2. Syntheses from the syn (methyl) and anti isomers of the ligand give the same products. The complexes characterized are Cu(LH2)X2,yH2O (X = Cl-, ClO4-; y = 0, 1, 2) and Cu(LH)X (X = Cl-, Br-, ClO4-). The complex Cu(LH)Br is shown by X-ray structure analysis to contain dimeric units (Cu(LH))22+ with crystallographic C2 symmetry and with the copper atom in a trigonal bipyramidal coordination environment. Stability constants for the reactions Cu2+ + LH2 ←→ Cu(LH2)2+ (log K = 13.24 � 0.05) and Cu(LH2)2+ ←→ Cu(LH)+ + H+ (log K = -3.24 � 0.08) are reported, as well as the magnetic susceptibilities, i.r. spectra, and electronic absorption spectra of the complexes.

The crystal chemistry of Mn3+ in the clino- and orthozoisite structure types, Ca2M33+[OH|O|SiO4|Si2O7]: A structural and spectroscopic study of some natural piemontites and “thulites” and their synthetic equivalents

2002 ◽  
Vol 217 (11) ◽  
Author(s):  
K. Langer ◽  
E. Tillmanns ◽  
M. Kersten ◽  
H. Almen ◽  
R. K. Arni
Keyword(s):  
Single Crystal ◽  
Spectroscopic Study ◽  
Absorption Spectra ◽  
Crystal Chemistry ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Detailed Evaluation ◽  
Strong Spin

AbstractSix new structure refinements and eleven sets of polarised, single-crystal electronic absorption spectra,Manganese in “thulite” is trivalent, as it is in piemontite. In both structure types, MThe detailed evaluation of the changes, due to Al→MThe polarisation behaviour of the three strong spin-allowed dd-bands of Mn

Spectral and electrochemical study of coordination molecules Cu4OX6L4: 3-Methylpyridine and 4-Methylpyridine Cu4OBrnCl(6−n)L4 complexes

2006 ◽  
Vol 60 (1) ◽  
Author(s):  
G. Ondrejovič ◽  
A. Kotočová
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Far Infrared ◽  
High Energy ◽  
Low Energy ◽  
Ligand Field ◽  
Cyclic Voltammograms ◽  
Energy Bands ◽  
Trigonal Bipyramidal

AbstractThe tetranuclear Cu4OBrnCl(6-n)L4 complexes, where L = 3-methylpyridine (3-Mepy), 4-methylpyridine (4-Mepy) and n=0–6 with trigonal bipyramidal coordination of copper(II) were prepared and their infrared and electronic absorption spectra as well as cyclic voltammograms in nitromethane solutions were measured. The polyhedra in Cu4OBrnCl(6−n) (3-Mepy)4 molecules are less distorted comparing with those of 4-Mepy analogues as indicated by infrared Cu4O absorptions, far infrared Cu—Br, Cu—Cl, and Cu—N absorptions, d—d bands in electronic spectra and potentials, measured by cyclic voltammetry. The 3-Mepy complexes exhibit strong single infrared Cu4O absorptions, while for related 4-Mepy complexes doubly split Cu4O bands were observed. Two strongly overlapped d—d bands in electronic absorption spectra of the 3-and 4-Mepy complexes in nitromethane were resolved by Gaussian fitting. The 4-Mepy ligand produces slightly stronger ligand field than its 3-Mepy analogue. The maxima of high-energy d—d bands are in a linear correlation with the number of bromide ligands. The correlations for corresponding low-energy bands are considerably deviated from linearity. The halfwave potentials of the complexes in nitromethane correlate with both the number of bromides and the data of electronic absorption spectra suggesting that the reducing electron at the electrode process enters the half-filled d z 2 orbital of the copper(II) atom. The origin of a difference between the 3-and 4-Mepy complexes in their spectral and electrochemical properties is also discussed.

Preparation and Characterization of a Novel Optical Material Based on Zinc-Tetraphenylporphyrin

2012 ◽  
Vol 476-478 ◽  
pp. 1254-1257
Author(s):  
Xiao Kang Li ◽  
Xiao Hui He ◽  
Yi Wang Chen ◽  
Xiao Lin Fan ◽  
Qing Dao Zeng
Keyword(s):  
Single Crystal ◽  
Absorption Spectra ◽  
Blue Light ◽  
Electronic Absorption ◽  
Fluorescence Spectra ◽  
Electronic Absorption Spectra ◽  
Supramolecular Complex ◽  
Optical Material ◽  
X Ray

Supramolecular complex，Zinc-tetraphenylporphyrin, 4,4’-azopyridine, Luminescence. Abstract. A new supramolecular complex(C44H28N4Zn)2•(C10H8N4)•(C7H8)(1) has been prepared by Zinc-tetraphenylporphyrin(ZnTPP) coordinated with 4,4’-azopyridine, which has been characterized by X-ray single-crystal diffraction.The electronic absorption spectra and fluorescence spectra reveal that the complex displays strong blue light and fluorescence, which is a good optical material.

The synthesis and properties of tris(dithioacetylacetonato) complexes of iron(III), ruthenium(III), and osmium(III)

1970 ◽  
Vol 23 (9) ◽  
pp. 1721 ◽  
Author(s):  
GA Heath ◽  
RL Martin
Keyword(s):  
Charge Transfer ◽  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Magnetic Susceptibilities ◽  
Electron Reduction

The syntheses of the iron(111), ruthenium(111), and osmium(111) complexes of dithioacetylacetone are described. The tris chelates are neutral low-spin (S = 1/2)monomers. Polarography in acetone reveals a ready one-electron reduction for each complex. Infrared and e.s.r. spectra are reported. The magnetic susceptibilities have been measured as a function of temperature. The electronic absorption spectra are compared with those of the related cobalt(111) group complexes, and some tentative assignments of charge transfer bands are provided.

N(ls) X-Ray Photoelectron and Electronic Absorption Spectra of Poly(squarylamides)

1975 ◽  
Vol 8 (6) ◽  
pp. 730-734 ◽  
Author(s):  
Eberhard W. Neuse ◽  
Brian R. Green ◽  
Reiner Holm
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
X Ray
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