Polarized electronic absorption spectra for potassium tetrabromoplatinate(II) dihydrate. Spectral effects of a platinum(IV) component
Journal Article
·
· Inorg. Chem.; (United States)
Crystals of the metastable compound K/sub 2/PtBr/sub 4/.2H/sub 2/O have an orthorhombic structure, space group Pbam, with a:b:c = 8.31 (2):13.73 (3):4:84 (1) A and Z = 2. The PtBr/sub 4//sup 2 -/ ions occupies a crytallographic site of C/sub 2h/ symmetry but retains essentially a D/sub 4h/ molecular symmetry with the z axis directed along c. The absorption spectra in the d reverse arrow d region were recorded for a, b, and c polarizations. Band maxima lie at 300 to 800 cm/sup -1/ higher energies than in anhydrous K/sub 2/PtBr/sub 4/. The /sup 1/A/sub 2g/ reverse arrow /sup 1/A/sub 1g/ transition, forbidden in z polarization, was not observed in polarization. Vibrational components were resolved in the /sup 3/B/sub 1g/ shoulder and in the /sup 1/A/sub 2g/ peak. Striking differences in intensities which occurred in the a and b polarization indicated that crystal effects were important in the vibronic excitation process. Red sections, in some crystals, were attributed to a dipole-allowed band, completely c polarized, for a mixed-valence electron-transfer transition involving a PtBr/sub 6//sup 2 -/ impurity defect. 6 figures, 3 tables.
- OSTI ID:
- 5561745
- Journal Information:
- Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 17:8; ISSN INOCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTRA
ALKALI METAL COMPOUNDS
ANIONS
BOND ANGLE
BROMIDES
BROMINE COMPOUNDS
CHARGED PARTICLES
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DATA FORMS
DIFFRACTION
DISTANCE
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
HALIDES
HALOGEN COMPOUNDS
HYDRATES
IMPURITIES
INFORMATION
INTERATOMIC DISTANCES
IONS
ISOLATED VALUES
LATTICE PARAMETERS
MEDIUM TEMPERATURE
METASTABLE STATES
NUMERICAL DATA
ORTHORHOMBIC LATTICES
PLATINUM BROMIDES
PLATINUM COMPOUNDS
POTASSIUM BROMIDES
POTASSIUM COMPOUNDS
SCATTERING
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VERY LOW TEMPERATURE
VIBRATIONAL STATES
X-RAY DIFFRACTION
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTRA
ALKALI METAL COMPOUNDS
ANIONS
BOND ANGLE
BROMIDES
BROMINE COMPOUNDS
CHARGED PARTICLES
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DATA FORMS
DIFFRACTION
DISTANCE
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
HALIDES
HALOGEN COMPOUNDS
HYDRATES
IMPURITIES
INFORMATION
INTERATOMIC DISTANCES
IONS
ISOLATED VALUES
LATTICE PARAMETERS
MEDIUM TEMPERATURE
METASTABLE STATES
NUMERICAL DATA
ORTHORHOMBIC LATTICES
PLATINUM BROMIDES
PLATINUM COMPOUNDS
POTASSIUM BROMIDES
POTASSIUM COMPOUNDS
SCATTERING
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VERY LOW TEMPERATURE
VIBRATIONAL STATES
X-RAY DIFFRACTION