Room-temperature thermally induced relaxation effect in a two-dimensional cyano-bridged Cu-Mo bimetal assembly and thermodynamic analysis of the relaxation process
We observed a photo-switching effect in [CuII(1,4,8,11-tetraazacyclodecane)]2[MoIV(CN)8]·10H2O by irradiation with 410-nm light around room temperature using infrared spectroscopy. This photo-switching is caused by the photo-induced charge transfer from MoIV to CuII. The photo-induced phase thermall...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2013-04-01
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| Series: | AIP Advances |
| Online Access: | http://link.aip.org/link/doi/10.1063/1.4802970 |
| _version_ | 1818584460465012736 |
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| author | Yoshikazu Umeta Hiroko Tokoro Noriaki Ozaki Shin-ichi Ohkoshi |
| author_facet | Yoshikazu Umeta Hiroko Tokoro Noriaki Ozaki Shin-ichi Ohkoshi |
| author_sort | Yoshikazu Umeta |
| collection | DOAJ |
| description | We observed a photo-switching effect in [CuII(1,4,8,11-tetraazacyclodecane)]2[MoIV(CN)8]·10H2O by irradiation with 410-nm light around room temperature using infrared spectroscopy. This photo-switching is caused by the photo-induced charge transfer from MoIV to CuII. The photo-induced phase thermally relaxed to the initial phase with a half-life time of 2.7 × 101, 6.9 × 101, and 1.7 × 102 s at 293, 283, and 273 K, respectively. The relaxation process was analyzed using Hauser's equation, k = k0exp[−(Ea + Ea*γ) / kBT], where k is the rate constant of relaxation, k0 is the frequency factor, Ea is the activation energy, Ea* is the additional activation energy due to the cooperativity, and γ is the fraction of the photo-induced phase. k0, Ea, and Ea* were evaluated as 1.28 × 107 ± 2.6 s−1, 4002 ± 188 cm−1, and 546 ± 318 cm−1, respectively. The value of Ea is much larger than that of the relaxation process for the typical light-induced spin crossover effect (Ea ≈ 1000 cm−1). Room-temperature photo-switching is an important issue in the field of optical functional materials. The present system is useful for the demonstration of high-temperature photo-switching material. |
| first_indexed | 2024-12-16T08:21:32Z |
| format | Article |
| id | doaj.art-75b1082f3a1d49638dc730a4aea54f50 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-16T08:21:32Z |
| publishDate | 2013-04-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-75b1082f3a1d49638dc730a4aea54f502022-12-21T22:38:06ZengAIP Publishing LLCAIP Advances2158-32262013-04-013404213304213310.1063/1.4802970Room-temperature thermally induced relaxation effect in a two-dimensional cyano-bridged Cu-Mo bimetal assembly and thermodynamic analysis of the relaxation processYoshikazu UmetaHiroko TokoroNoriaki OzakiShin-ichi OhkoshiWe observed a photo-switching effect in [CuII(1,4,8,11-tetraazacyclodecane)]2[MoIV(CN)8]·10H2O by irradiation with 410-nm light around room temperature using infrared spectroscopy. This photo-switching is caused by the photo-induced charge transfer from MoIV to CuII. The photo-induced phase thermally relaxed to the initial phase with a half-life time of 2.7 × 101, 6.9 × 101, and 1.7 × 102 s at 293, 283, and 273 K, respectively. The relaxation process was analyzed using Hauser's equation, k = k0exp[−(Ea + Ea*γ) / kBT], where k is the rate constant of relaxation, k0 is the frequency factor, Ea is the activation energy, Ea* is the additional activation energy due to the cooperativity, and γ is the fraction of the photo-induced phase. k0, Ea, and Ea* were evaluated as 1.28 × 107 ± 2.6 s−1, 4002 ± 188 cm−1, and 546 ± 318 cm−1, respectively. The value of Ea is much larger than that of the relaxation process for the typical light-induced spin crossover effect (Ea ≈ 1000 cm−1). Room-temperature photo-switching is an important issue in the field of optical functional materials. The present system is useful for the demonstration of high-temperature photo-switching material.http://link.aip.org/link/doi/10.1063/1.4802970 |
| spellingShingle | Yoshikazu Umeta Hiroko Tokoro Noriaki Ozaki Shin-ichi Ohkoshi Room-temperature thermally induced relaxation effect in a two-dimensional cyano-bridged Cu-Mo bimetal assembly and thermodynamic analysis of the relaxation process AIP Advances |
| title | Room-temperature thermally induced relaxation effect in a two-dimensional cyano-bridged Cu-Mo bimetal assembly and thermodynamic analysis of the relaxation process |
| title_full | Room-temperature thermally induced relaxation effect in a two-dimensional cyano-bridged Cu-Mo bimetal assembly and thermodynamic analysis of the relaxation process |
| title_fullStr | Room-temperature thermally induced relaxation effect in a two-dimensional cyano-bridged Cu-Mo bimetal assembly and thermodynamic analysis of the relaxation process |
| title_full_unstemmed | Room-temperature thermally induced relaxation effect in a two-dimensional cyano-bridged Cu-Mo bimetal assembly and thermodynamic analysis of the relaxation process |
| title_short | Room-temperature thermally induced relaxation effect in a two-dimensional cyano-bridged Cu-Mo bimetal assembly and thermodynamic analysis of the relaxation process |
| title_sort | room temperature thermally induced relaxation effect in a two dimensional cyano bridged cu mo bimetal assembly and thermodynamic analysis of the relaxation process |
| url | http://link.aip.org/link/doi/10.1063/1.4802970 |
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