基于溴化1,4-二异丙基-1,4-二氮杂二环[2.2.2]辛烷配体的铁弹相变材料的合成及性质研究
Journal of Jiangsu University of Science and Technology(Natural Science Edition)(2017)
Abstract
通过溶液法合成无色棒状化合物1,4-二异丙基-1,4-二氮杂二环[2.2.2]辛烷四氯溴-锌(II),分子式为C12H26N2·ZnBr1.25Cl2.75(1).差示扫描量热法测试结果表明:该化合物在235.2 K时发生了可逆相变并伴随有8.4 K的滞后.单晶X射线衍射结果表明:该化合物从室温相的Pmna空间群[a=13.746 9(13) (A),b=10.160 8(10)(A),c=13.160 4(12)(A),V=1 838.2(3)(A)3 和Z=4]变化到低温相的P212121[a=10.0987(7) (A),b=13.0778(10) (A),c=13.6093(10)(A),V=1 797.4(2) (A)3 和Z=4],这可以归属为铁弹型相变,Dabco环的扭曲可能是导致发生相变的原因.
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Key words
differential scanning calorimetry,gyrotropic phase transition,variable-temperature X-ray,symmetry breaking
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