| SYNTHESIS AND MESOMORPHIC PROPERTIES OF PALLADIUM CHELATES OF LIQUID CRYSTAL POLYSILOXANE WITH β-DIKETONE-BASED SIDE CHAINS |
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| 引用本文： | 周朝晖,戴道荣,张榕本.SYNTHESIS AND MESOMORPHIC PROPERTIES OF PALLADIUM CHELATES OF LIQUID CRYSTAL POLYSILOXANE WITH β-DIKETONE-BASED SIDE CHAINS[J].高分子科学,1992,0(1):70-74. |
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| 作者姓名： | 周朝晖 戴道荣 张榕本 |
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| 作者单位： | Institute of Chemistry，Academia Sinica，Beijing，100080，Institute of Chemistry，Academia Sinica，Beijing，100080，Institute of Chemistry，Academia Sinica，Beijing，100080 |
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| 摘 要： | A new type of palladium chelate of β-diketone-based side chain liquid crystal polysiloxane (Pd-DKLCP) has been synthesized by chelation reaction of palladium dichloride with polymeric ligand, β-diketone polysiloxane (DKLCP), using THF as solvent at R.T.. The Pd-chelation results in greatly increasing the phase transition temperature T_K and the enthalpy change △H_K from crystal to liquid crystal state and making the temperature range of LC state △T(△T=T_(Cl)-T_K) widened. All these chelates Pd-DKLCP's do not show T_(Cl) until decomposition at 205℃. It is noteworthy that the Pd-chelation can exert more positive effect on the mesomorphic behaviour of the polymer ligand than the counterpart Cu-DKLCP does. It is probable due to the bigger size of disc-like mesogen formed from β-diketone and Pd~(+2) ion with 4d orbital.
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| 关 键 词： | β-Diketone Palladium chelate Metal-coordinating liquid crystal |
| 收稿时间： | 1991-04-05 |
SYNTHESIS AND MESOMORPHIC PROPERTIES OF PALLADIUM CHELATES OF LIQUID CRYSTAL POLYSILOXANE WITH β-DIKETONE-BASED SIDE CHAINS |
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| ZHOU Zhaohui,DAI Daorong,ZHANG Rongben.SYNTHESIS AND MESOMORPHIC PROPERTIES OF PALLADIUM CHELATES OF LIQUID CRYSTAL POLYSILOXANE WITH β-DIKETONE-BASED SIDE CHAINS[J].Chinese Journal of Polymer Science,1992,0(1):70-74. |
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| Authors: | ZHOU Zhaohui DAI Daorong ZHANG Rongben |
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| Institution: | Institute of Chemistry; Academia Sinica; Beijing |
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| Abstract: | A new type of palladium chelate of β-diketone-based side chain liquid crystal polysiloxane (Pd-DKLCP) has been synthesized by chelation reaction of palladium dichloride with polymeric ligand, β-diketone polysiloxane (DKLCP), using THF as solvent at R.T.. The Pd-chelation results in greatly increasing the phase transition temperature TK and the enthalpy change △H_K from crystal to liquid crystal state and making the temperature range of LC state △T(△T=TCl-TK) widened. All these chelates Pd-DKLCP's do not show TC1 until decomposition at 205℃.It is noteworthy that the Pd-chelation can exert more positive effect on the mesomorphic behaviour of the polymer ligand than the counterpart Cu-DKLCP does.It is probable due to the bigger size of disc-like mesogen formed from β-diketone and Pd2+ ion with 4d orbital. |
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