嵌入化合物FeOCl(HQ)_(0.78)的合成与性能研究  

Synthesis and Study of New Intercalation Compound of FeOCl(8-Hydroxy-Quinoline)_(0.78)

作　　者：戴耀东[1] 钟义兵[1] 韩薇[1] 伍亚军[1] 常树全[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《南京航空航天大学学报》2005年第5期643-647,共5页Journal of Nanjing University of Aeronautics & Astronautics

摘　　要：利用水热合成法制备了一种新的有机-无机杂化化合物——F eOC l(HQ)0.78,其中HQ为8-羟基喹啉。嵌入的有机分子与主体材料的摩尔比为0.78,远远高于一些非共面的有机分子的嵌入量,结构表征后表明HQ的共平面垂直于F eOC l的ac面。低温磁化率、穆斯堡尔谱学和电子顺磁共振研究表明,化合物F eOC l(HQ)0.78表现为弱的反铁磁性,微观磁结构由F eOC l中的非共线结构转变为共线的反铁磁结构。The hydrothermal method is used to synthesize intercalation compounds firstly to intercalate co-plane organic molecules into the layers of host compound of FeOCl. Especially, the effective preparation for 8-Hydroxy-Quinoline molecules indicates the molar ratio of donor to FeOCl is 0.78, which is higher than other intercalation compounds with non-coplanar donors and agrees with the estimation value based on crystal packing modeling. It is reasonably described by a suggested crystal packing modeling due to compact ππ stacking of donors. The donors of 8-HQ within co-planar vertical to the layer of host FeOCl are interacted with host FeOCl via weak chemical bonds. The further studies reveal the charge transfer process from donor to the FeOCl occurs due to the intercalation, and the extra electrons on the layer reduce Fe^3＋ sites partially to build the mixed-valence state of irons. The reconstructed structure of after intercalation by （8-Hydroxy-Quinoline）0.78 is exhibited and the co-plane of donor is vertical to the layer of FeOCl （ac-plane） within high efficient intercalations. In order to study charge transfer and magnetic behavior of the intercalation compound, the temperature dependence of magnetic susceptibility,^57Fe Moessbauer spectroscopy as well as electron spin resonance are applied. The long-range antiferromagnetic coupling of FeOCl is interrupted by the donor insertion between layers but the short-range magnetic interactions in the FeOCl layers still remain.

关 键 词：嵌入化合物 反铁磁性 晶体构造模型 水热合成法 

分 类 号：O482.52[理学—固体物理] O281.4[理学—物理]