Abstract
p-Phenylenediamine dihydroperchlorate, $C_6H_4N_2H_4{\cdot}2HC1O_4$, crystallizes in space group $P\={1}$ with $a=4.79{\pm}0.02,\;b=9.03{\pm}0.02,\;c=7.12{\pm}0.03{\AA},\;{\alpha}=109.4{\pm}0.2,\;{\beta}=79.6{\pm}0.2,\;r=104.6{\pm}0.2^{\circ},\;Z=1$. The structure has been solved by the Patterson and Fourier methods. The refinement by block-diagonal least-squares cycles gives R = 0.13 for 387 observed reflexions collected on equi-inclination Weissenberg photographs with CuK${\alpha}$ radiation. There are two different types of five hydrogen bonds. The first type consists of one trifurcated N${\cdot}{\cdot}{\cdot}$O hydrogen bond and the second of two normal N${\cdot}{\cdot}{\cdot}$O hydrogen bonds, both of which exist between the amino group and the perchlorate, groups. A p-phenylenediamine group is approximately planar within an experimental error and bonded to twelve perchlorates: ten perchlorates forming hydrogen bonds and two being contacted with the van der Waals forces. A perchlorate group is surrounded by six p-phenylenediamines and four perchlorates; among the six p-phenylenediamines, five of them are hydrogen-bonded, and the rest contacted with the van der Waals force.ce anaysis of our samples and investigated the variarions in the values of parameters obtained through fitting the theoretical impedance to the experimental impedance. The characters of the dielectric constant and the impedance showed abnormal variations for the 0.2 at K-doped NSBN ceramics, which we were able to interpret in terms of the variations in the number A-site vacancies with the K doping ratio. From these results, A-site vacancies are thought to be space charges that influence the ferroelectric properties of NSBN ceramics.
p-Phenylenediamine dihydroperchlorate의 세포상수는 $a=4.79{\pm}0.02,\;b=9.03{\pm}0.02,\;c=7.12{\pm}0.03{\AA},\;{\alpha}=109.4{\pm}0.2,\;{\beta}=79.6{\pm}0.2,\;r=104.6{\pm}0.2^{\circ},\;Z=1$이며 공간군은 $P\={1}$이다. 구조는 Patterson 및 Fourier법으로 해석하였으며 block diagonal 최소자승법으로 정밀화하였따. 등경사 Weissenberg 사진들에서 얻은 387개의 관측된 반사에 대하여 R값은 0.13이었다. 이 물질의 결정구조에서 수소결합은 아미노기와 과염소산 이온 사이에서 이루어져 있으며 2가지 형이 있다. 첫째것은, 한개의 삼지형 N${\cdot}{\cdot}{\cdot}$O 수소결합이고, 둘째것은, 보통형의 2개의 N${\cdot}{\cdot}{\cdot}$O 수소 결합이다. 한개의 p-phenylenediamine 그룹은 실험오차 내에서 평면이며 12개의 과염소산이온에 결합되어 있다. 그중 10개의 과염소산이온은 수소결합으로 연결되어 있으며 2개는 van der Waals 힘들로 접촉되어 있다. 한개의 과염소산이온은 6개의 p-phenylenediamine과 4개의 과염소산이온에 의하여 둘러싸여 있따. 6개의 p-phenylenediamine 그룹 중 5개는 수소결합이 되어있고 나머지는 van der Waals 힘으로 접촉되어 있다.