期刊
ACS NANO
卷 9, 期 9, 页码 8960-8966出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b02840
关键词
spin crossover; molecular switches; light-induced excited spin-state trapping; surfaces; X-ray absorption spectroscopy
类别
资金
- DFG [Sfb 677, Sfb 658]
Spin crossover (SCO) complexes possess a bistable spin state that reacts sensitively to changes in temperature or excitation with light. These effects have been well investigated in solids and solutions, while technological applications require the immobilization and contacting of the molecules at surfaces, which often results in the suppression of the SCO. We report on the thermal and light-induced SCO of [Fe(bpz)(2)phen] molecules in direct contact with a highly oriented pyrolytic graphite surface. We are able to switch on the magnetic moment of the molecules by illumination with green light at T=6K, and off by increasing the temperature to 65K. The light-induced switching process is highly efficient leading to a complete spin conversion from the low-spin to the high-spin state within a submonolayer of molecules. [Fe(bpz)(2)phen] complexes immobilized on weakly interacting graphite substrates are thus promising candidates to realize the vision of an optically controlled molecular logic unit for spintronic devices.
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