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Figure 4
The IR and UV–vis spectra for PTC illustrating electronic transitions at ∼ 0.7 and ∼ 1.8 eV. Following previous studies based upon Co2+ in a tetrahedral environment, we assign both of these transitions as excitations from the ground 4A2 orbital singlet to the excited 4T1 orbital levels.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 71| Part 1| January 2015| Pages 20-24
doi:10.1107/S2052520614024809
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