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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Dielectric properties and electronic absorption: a comparison of novel azo- and oxo-bridged phthalocyanines
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Dielectric properties and electronic absorption: a comparison of novel azo- and oxo-bridged phthalocyanines

机译：介电性能和电子吸收：新型偶氮和氧桥酞菁的比较

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摘要

The novel two homologous phthalocyanine (Pc) series (azo-and oxo-bridged) substituted with a 5-bromo-2-methoxyphenyl moiety were synthesized and characterized. The physical and chemical properties of the Pcs were compared with each other for the first time. The ac response of the Pcs was also studied by impedance measurements over a temperature range of 300-500 K. The real and imaginary parts of the impedance were found to be dependent on both frequency and temperature. The impedance spectra of the samples displayed semicircular arcs in the complex plane plot at all temperatures, with their centres lying below the real axis at a particular angle of depression indicating the distribution of relaxation times. Measurements showed that the dielectric permittivity of azo-bridged phthalocyanines is significantly higher than that of the oxo-bridged homologs. This result can be attributed to the limited electron delocalization ability of oxo-bridged homologs.
机译：合成并表征了被5-溴-2-甲氧基苯基部分取代的新型两个同源的酞菁（Pc）系列（偶氮和氧桥）。首次将PC的物理和化学性质进行了比较。还通过在300-500 K的温度范围内进行阻抗测量来研究Pcs的交流响应。发现阻抗的实部和虚部均取决于频率和温度。在所有温度下，样品的阻抗谱在复杂平面图中均显示为半圆弧，其中心位于实轴下方，且具有特定的下陷角度，表明了弛豫时间的分布。测量表明，偶氮桥联酞菁的介电常数显着高于氧代桥联同系物的介电常数。该结果可以归因于氧桥联同系物的有限的电子离域能力。

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