| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 기능성 고분자 |
| 제목 | Storing Spin-Crossover and LC Phase Transitions Informations by Hybridizing Spin-Crossover Complexes with a Thermotropic Polymer Matrix – A Novel Case of Multiple Switching |
| 초록 | Transition metal complexes with d4-d7 electron configurations can adopt two different magnetic states, i.e. low-spin (LS) and high-spin(HS) states, which can crossover thermally or by photo excitation.[1] Spin-crossover phenomena have been attracting much attention in relation to their potential applications in molecular electronics.[2]The importance of this type magnetic materials is expected to increase in future advanced technologies, especially in the area of the so-called information and display technologies.[3-8 ] We studied the feasibility of storing together magnetic and liquid crystalline (LC) phase informations that would respond to thermal stimulus, i.e. heating or cooling in the composites prepared by mixing a side-group LC polyoxetane with two new SCO Fe(II) complexes. We have prepared two new spin-crossover(SCO) Fe(II) complexes, [Fe(II)(ODT)3](p-tol)2 (I) and [Fe(II)(HET)3](p-tol)2 (II), where ODT stands for octadecyltriazole, HET for hydroxyethyltriazole, and p-tol for p-toluenesulfonate. And they were blended with a liquid crystalline (LC) poly(oxetane) (POx). Thermal and spin crossover behavior of the composites then were studied by using a superconducting quantum interference device (SQUID), differential scanning calorimetry (DSC) and extended x-ray absorption fine structure (EXAFS) spectroscopy. When a composite carried higher than 10 wt.% of the Fe(II) complexes, it revealed a reversible spin crossover for the low spin(LS) ↔ high spin(HS) transition in addition to the thermal transitions, i.e. glass transition and isotropization of the LC polymer matrix. This work demonstrates that processable composites consisting of SCO complexes and an LC polymer matrix are novel hybrids exhibiting. The capacity of storing multiple functions or informations. Reference 1 Beattie, J. K. Adv. Inorg. Chem. 1988, 32, 1-49. 2 (a) Kahn, O.; Launay, J. P. Chemtronics 1988, 3, 140-151. (b) Kahn, O.; Kro¨ber, J.Jay, C. AdV. Mater. 1992, 4, 718-728. (c) Kahn, O.; Jay, C. Science 1998, 279, 44-48. (d) Real, J. A.; Gaspar, A. B.; Niel, V.; Munoz, M. C. Coord. Chem. ReV. 2002, 236, 121-141. 3. Gutlich, P.; Hauser, A.; Coord. Chem. Rev. 1990, 97, 1. 4. Kahn, O.; Kober, J.; Jay, C.; Adv. Mater. 1992, 4, 718. 5. Gütlich, P.; Hauser, A.; Spiering, H.; Angew. Chem. Int. Ed. Engl. 1994, 33, 2024. 6. Real, J. A.; Gaspar, A. B.; Niel, V.; Munoz, M. C.; Coord. Chem, Rev. 2003, 236, 121. 7. Carter (Ed.), F. L.; Molecular Electronic Devices. New York. 1987. 8. Hayami, S.; Gu, Z. Z.; Shiro, M.; Einaga, Y.; Fujishima, A.; Sato, O.; J. Am. Chem. Soc. 2000, 122, 1726. |
| 저자 | 정성훈, 진정일 |
| 소속 | 고려대 |
| 키워드 | spin crossover; POx/Fe(II)Complex composites; Hysteresis loop |
