Atomic valences of Co at (000) and (1/21/21/2) positions are calculated by Pauling bond valence theory, while atomic valences of Co at B site over +3, atomic valences of Co at (000) and (1/21/21/2) positions are + 2, + 3 and + 3 , + 4 respectively, i. e. appropriate vacancies can lead Co at B site to disproporlionation.
Three new mononuclear manganese complexes MnL 2 1·PhCOO -, MnL 2 2·PhCOOH, MnL 2 2·HAc were synthesized, and were also characterized by elemental analysis, determination valence, molar conductivity and electronic magnetic susceptibility, thermoanalyses, IR,Uv Vis,ESR spectra etc Possible structures of these complexes were brought out HL 1 and H 2L 2 represented salicylidene 1,2 phenylenediamine and salicylidene ortho hydroxyphenylamine respectively, both of which were tridentate ligands
ESR spectrum with no superfine structure confirms the presence of V 4+ and the average valence of vanadium in the product is +4.30 on the basis of TG and XPS.
Only strictly controlling the temperature can it be prepared what needed especially for the Cobalt, Manganese precursors because of many chemical valence.
Two binuclear manganese complexes: Mn2L12OH#3H2O (Mn2- , Mn3-) and Mn2L22 (O2CMe)2(Mn3+, Mn3+), where L1 and L2 are the dianions of tridentate schiff base obtained by condensing 2, 4-dihydroxybenzaldehyde with 2-aminoethanol and 3-amino-1-propanol respectively, have been synthesized and studied by elemental analyses, valence determination, electroconductivity, magnetic susceptipility, thermal analyses, UV-Vis, IR and ESR spectra etc. The possible structures of the complexes are suggeste.
This study aimed to describe the distribution of water-arsenic (As) valence states and its relationship to areas with endemic arsenism in the Datong basin.
This led us to conclude that the fraction of each water-arsenic valence state should be studied when determining the arsenic content of drinking water.
When ceric iodate is precipitated from acid solution by the addition of asoluble iodate,a gelatinous precipitate is obtained,which is difficult to filterand wash.The precipitate must be redissolved and reprecipitated as oxalatefor final ignition to ceric oxide.A method has been deviced to improve the form of the ceric iodateprecipitate by slow precipitation in homogeneous solution.Advantage is takenof the fact that cerium exists in two distinct valence states,the cerous and theceric.Cerous iodate is s...
1.在均匀溶液中沉淀的碘酸铈,性质紧密,便利于过滤和洗涤。烧灼成为氧化铈后,适合于作为铈的定量分析。2.利用碘酸亚铈能溶解于稀酸溶液而碘酸铈则不溶的区别,先用过氧化氢把全部铈离子还原,再加入碘酸铵,然后进行氧化,使碘酸铈在均匀溶液中沉淀出来。3.本方法适用于含氧化铈2.5—250毫克的样品。4.所得沉淀的分子式经初步测定为 C_(e2)(IO_3)_7(OH)·x H_2O,其中 x 的数值不定,涨落在3与5之间。
The nature of the chemical bond in conjugate triatomic molecules such as ClO2, O3, SO2, NO2, CO2, N3-, NO2+, N2O, HgCl2, etc. has been discussed from the point of view of the molecular orbital theory. It has been demonstrated quantum mechanically that the conditions of forming a conjugate π bond are: (1) Each atom of the AB2 molecule has a p orbital of approximately equal energy and parallel to one another; (2) the total number of p electrons must be less than two times the number of p orbitala. Triatomic m...
The amylose-iodine complex is an inclusion compound of a long chain of equi-distant iodine atoms in an amylose helix consisting of glucose units. Its spectrum has been explained quantummechanically by Cramer and Herbst and by Murakami using a one-dimensional free-electron model. But they obtained only the first absorption band, while it has been found, experimentally that there are at least two or possibly three more bands in the ultraviolet region (See Fig. 4, p. 22).In the present investigation we have pr...
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