Optical spectrum of dipotassium tetrafluorocuprate

Riley, Mark J.; Dubicki, Lucjan; Moran, Grainne; Krausz, Elmars; Yamada, Isao

doi:10.1021/ic00334a008

Cited by 28 publications

(39 citation statements)

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“…The evaluated E JT values are in the range 2400–3400 cm −1 for all used functionals, with the exception of OPBE, which gives a very high JT stabilization energy. Experimentally estimated E JT values from UV–Vis spectra are found to be 2082.5 or 2195.5 cm −1 66, 67. Thus, to explain the differences in R JT , the bond distances in [CuF 6 ] 4− at HS and LS nuclear configurations were analyzed and then compared with the available experimental data, Table 2 82, 83.…”

Section: Resultsmentioning

confidence: 99%

The role of macrophage inhibitory factor in tumorigenesis and central nervous system tumors

Bach

Deuster

Balzer‐Geldsetzer

et al. 2009

Cancer

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Poly(trimethoxy silylpropylaniline), a nanoporous (pore diameter of 2.4 nm), electroactive (stable reversible redox characteristics), electrochromic (yellow at −0.10 V, blue green at +0.50 V, and dark green at +0.70 V), and pH‐sensitive, silica–polyaniline (PANI) hybrid material (designated as KGM‐1) has been synthesized in powder form by a simple one‐pot chemical synthesis as well as a “thin nanolayered film” by cyclic voltammetry. High‐resolution transmission image of KGM‐1 informs that the particles are spherical, with diameters in the range of 0.5–1.5 μm. X‐ray diffraction pattern of pristine KGM‐1 confirms the combined presence of ordered silica network and PANI chains. The surface area of calcined KGM‐1 is 40 m2/g (∼15 times higher than KGM‐1), and the average pore size is 2.4 nm. The N2 adsorption features also inform that PANI is present as a uniform layer within the pores of silica and because of that the silica pores are not completely blocked. The reversible redox transitions in PANI units and nanoporosity of KGM‐1 are effectively used for the electro‐driven loading/release of DNA or adenosine 5′‐triphosphate. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010

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Section: Resultsmentioning

confidence: 99%

The role of macrophage inhibitory factor in tumorigenesis and central nervous system tumors

Bach

Deuster

Balzer‐Geldsetzer

et al. 2009

Cancer

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“…Considering initially an approximately D 4h symmetry, one may use the perturbation formula given previously for a tetragonally elongated copper(II) complex [53,54] for both g values and MCD parameters. Using the first-order expressions for the g values [54] with the experimental g values (Table 3) and taking an average energy of the E(xz,yz) and B 2 (xy) states as approximately 15,000 cm …”

Section: Ligand-field Analysis: Local Environment Of the Cu(ii) Ionmentioning

confidence: 99%

“…Using the first-order expressions for the g values [54] with the experimental g values (Table 3) and taking an average energy of the E(xz,yz) and B 2 (xy) states as approximately 15,000 cm …”

Section: Ligand-field Analysis: Local Environment Of the Cu(ii) Ionmentioning

confidence: 99%

Structural and spectroscopic studies of a model for catechol oxidase

et al. 2008

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A binuclear copper complex, [Cu 2 (BPMP) (OAc) 2 ][ClO 4 ]ÁH 2 O, has been prepared using the binucleating ligand 2,6-bis[bis(pyridin-2-ylmethylamino)methyl]-4-methylphenol (H-BPMP). The X-ray crystal structure reveals the copper centers to have a five-coordinate square pyramidal geometry, with the acetate ligands bound terminally. The bridging phenolate occupies the apical position of the square-based pyramids and magnetic susceptibility, electron paramagnetic resonance (EPR) and variable-temperature variable-field magnetic circular dichroism (MCD) measurements indicate that the two centers are very weakly antiferromagnetically coupled (J = -0.6 cm -1 ). Simulation of the dipole-dipole-coupled EPR spectrum showed that in solution the Cu-O-Cu angle was increased from 126°to 160°and that the internuclear distance was larger than that observed crystallographically. The high-resolution spectroscopic information obtained has been correlated with a detailed ligand-field analysis to gain insight into the electronic structure of the complex. Symmetry arguments have been used to demonstrate that the sign of the MCD is characteristic of the tetragonally elongated environment. The complex also displays catecholase activity (k cat = 15 ± 1.5 min -1 , K M = 6.4 ± 1.8 mM), which is compared with other dicopper catechol oxidase models.

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“…[26][27][28] The present study can be compared to those cases where Cu͑II͒ is doped into a cubic host. This results in Jahn-Teller distorted tetragonally elongated Cu II L 6 species being formed with local D 4h symmetry, and occurs for the cubic KZnF 3 ͑Ref.…”

Section: E MCD Selection Rulesmentioning

confidence: 99%

The highly resolved electronic spectrum of the square planar CuCl42− ion

Dick

Rahemi

Krausz

et al. 2008

The Journal of Chemical Physics

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Articles you may be interested inAbsence of exchange interaction between localized magnetic moments and conduction-electrons in diluted Er3+ gold-nanoparticles J. Appl. Phys. 115, 17E128 (2014) The low temperature magnetic circular dichroism ͑MCD͒ and electron paramagnetic resonance ͑EPR͒ spectra of Cu͑II͒ doped Cs 2 ZrCl 6 are reported. The Cu͑II͒ ion is incorporated as the square planar copper tetrachloride ion, CuCl 4 2− , which substitutes at the Zr͑IV͒ site in the Cs 2 ZrCl 6 lattice, with a complete absence of axial coordination. Both the EPR and MCD show highly resolved spectra from which it is possible to determine the superhyperfine coupling constants and excited state geometries respectively. The Franck-Condon intensity patterns suggest that there is a substantial relaxation of the host lattice about the impurity ion. For the lowest energy 2 B 1g ͑x 2 -y 2 ͒ → 2 B 2g ͑xy͒ transition, both the magnetic dipole allowed electronic origin as well as vibronic false origins are observed. The high resolution of the spectra allowed the accurate determination of the odd parity vibrations that are active in the spectra. The opposite sign of the MCD of the two components of the 2 E g ͑xz , yz͒ excited state allows this splitting to be determined for the first time. Accurate and unambiguous spectral parameters for the CuCl 4 2− ion are important as it has become a benchmark transition metal complex for theoretical electronic structure calculations.

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Optical spectrum of dipotassium tetrafluorocuprate

Cited by 28 publications

References 1 publication

The role of macrophage inhibitory factor in tumorigenesis and central nervous system tumors

The role of macrophage inhibitory factor in tumorigenesis and central nervous system tumors

Structural and spectroscopic studies of a model for catechol oxidase

The highly resolved electronic spectrum of the square planar CuCl42− ion

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