含锆碳硅陶瓷先驱体的半经验理论研究  

A Semi-empirical theoretical study of the polyzirconcarbosilane ceramic precursors

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作  者:董菊莲 张晨晨[1] 陆远芳 胡继东[2] 李军平[2] 冯志海[2] 孟志忠[2] 

机构地区:[1]华南理工大学生物科学与工程学院,广东广州510006 [2]航天材料及工艺研究所,北京100076

出  处:《分子科学学报》2014年第1期6-11,共6页Journal of Molecular Science

摘  要:采用PM6方法对添加了配体Zr(AcAc)4,Zr(NH(C2H5))4,ZrCp2Cl2,ZrCp2ClH形成的16种含锆碳硅陶瓷先驱体(PZCS)和PCS(10)的几何结构、电子属性、反应能进行了系统的理论研究,结果表明:(1)大体积的Zr(AcAc)4带来的的空间效应并未过多的影响Si—Zr键的键长;(2)从单配体衍生物到对应的多配体衍生物HOMO-LUMO能隙趋向于减小,配体Zr(NH(C2H5))4得到的衍生物的能隙下降幅度最大.ZrCp2Cl2得到的衍生物的能隙比对应的ZrCp2ClH的能隙要大;(3)16种PZCS的反应能均为负值,随配体数的增加,Zr(NH(C2H5))4的衍生物的反应能减小,而其他三种配体的衍生物的反应能增大.A systematical study of geometrical structure, electronicproperties and thermal stabilities was performed adopting emi-empirical PM6 method to investigate complexes of poly earbosilane(PCS) and 16 kinds of polyzirconcarbosilane (PZCS) added ligand of Zirconium(Ⅳ) Acetylacetonate. Tetrakis (ethylamino) Zirconium ( Ⅳ). Zirconocene (Ⅳ ) Dichloride. Zirconocene (Ⅳ ) Chlorine hydrogen which contained. The results show that: (1) Si--Zr bond length did not affect by the space of big volume of Zirconium(Ⅳ) Acetylacetonate very much; (2) The HOMO-LUMO energy gap tends to decrease from solo ligand derivatives to the corresponding multi-ligand derivatives and the ligand derivatives of Tet- rakis(ethylamino )Zirconium(Ⅳ) shows biggest energy gap decrease. The energy gap of Zirconocene (Ⅳ) Dichloride derivatives is larger than that of Zirconocene(Ⅳ) Chlorine and hydrogen derivatives; (4) thereaction energy of 16 kinds of PZCS are all negative. With the increasing the number of lig- ands, the reaction energy of derivative of the Tetrakis (ethylamino)Zirconium (Ⅳ) is decreasing , while the other three derivatives behave in opposite way.

关 键 词:半经验PM6 锆碳硅陶瓷先驱体 配体 

分 类 号:O604[理学—化学]

 

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