Thermochromic effects in a Jahn-Teller active CuCl(4-)6 layered hybrid system.
The hybrid material copper (II) tetrachloro-bis(phenyl ethyl ammonium) (C6H5CH2CH2NH3)2CuCl4, or PEACuCl, has been investigated by temperature-dependent spectroscopic absorption experiments. The absorption bands observed in the near-infrared region (1.3-1.9 eV) generally exhibit redshifts with increasing temperature. The temperature-induced energy shifts of the spectral components are shown to be consistently related to temperature-induced Cu-Cl bond length changes. Additionally, the thermochromic color change is caused by a charge transfer band edge redshifting (in the visible region 2.0-2.8 eV) with increasing temperature. By comparison with similar Cu-based systems, it is suggested that this shift is caused by broadening and strengthening of the band.
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
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Caretta
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Miranti
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Arkenbout
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Polyakov
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Meetsma
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Hidayat
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Tjia
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Palstra
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van Loosdrecht
D002712:Chlorides / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D004583:Electrons; D044367:Phase Transition; D019265:Spectroscopy, Near-Infrared; D013696:Temperature; D013818:Thermogravimetry; D014961:X-Ray Diffraction
D002712:Chlorides; D056831:Coordination Complexes; D003300:Copper