The coordination number and distance around Ge atoms in two binary systems Bi_2O_3-GeO_2 and P_2O_5-GeO_2 glasses have been measured in a labor- atory EXAFS facility using GeO_2 (hexagonal) as a model compouud.
The average Zr—F—Zr bond angle slightly increases from 136.7° to 141.4°(corresponding to symmetric vibration frequencies SS(Zr—F_b ) from 478 to 482 cm~(-1)) and average coordination number of Zr~(4+) shows a tendency to decrease as ZnF_2 content increases from 0 to 6 mol%.
The result shows that the La-CS coordination polymer involves five oxygen atoms and five nitrogen atoms of five chitosan residues per La ion,so the coordination number is 10. The catalytic activity of the La-CS coordination polymer-Na 2SO 3 for the polymerization of MMA is also reported.
Within complex being producted, coordination number and coordination constant have been calculated when Cu2+ and Zn2+ complex with HPAM. The effect of HD on coordination number has also been studied.
In a solution of pH 6.260-6.865,the Raspberry Ketone reacts with Ni (NO3)2 to produce stable coordination compound. The coordination number is 1:1 and formation constant of coordination compound is 8.520.Its maximum absorbency wavelength is λmax =228 nm.
The soaking method using mixture solution of acetone and ethanol shows synergistic character. The studies of synergistic extraction indicated that the mole ratio of ethanol in mixture solution was 0 5 and synergistic coefficiency R was 1 85 at the maximum of distribution ratio, and coordination number was 1 for acetone, ethanol, and mixture of acetone and ethanol coordinated chlorophyll.
The crystal is monoclinic with space group P2 1/n , a=0.9631(2)nm,b=1.6415(5)nm,c=1.6209(3)nm,β=102.98(2)°,Z=4,Dx=1.653Mg. m -3 .The coordination number of Y(Ⅲ) is 9 with the geometry of a monocapped square antiprism.
The crystal belongs to a monoclinic system, space group is P21/n with a=0. 9700(2) nm, 6=1. 5966(2) nm, c = 1. 9085(1) nm, β= 104. 71(3)°, V = 2. 8588(50) nm3, Z = 4, Dcalc=1. 93 g/cm3. The coordination number of lanthanum ion is nine, forming a distorted monocapped square antipriosm.
It is found that the dependence of the fluctuation free volume fraction on the mean coordination number Zm, which characterizes the degree of connectivity of the network in noncrystalline materials, exhibits nonmonotonic behavior.
It is established that the aforementioned multivalent cations in glasses and melts have a coordination number of four and play the role of network-formers.
It is noted that the fluctuation free volume fraction fg is a nonmonotonic function of the mean coordination number Zm and that it exhibits a specific dependence on the lattice Grüneisen parameter γ.
These parameters reveal an increase with x, which can be attributed to the increase in the average coordination number with an increase in the bismuth content (at %) in the composite.
1. Eight new chelates have been prepared from uranyl nitrate and Schiff bases, and all of them contain two molecules, of nitric acid to satisfy coordination number of uranium which is eight in these complexes.2. Results of thermogravimetric analysis of these complexes show that the two nitric acid molecules are in the inner sphere and coordinated directly to uranium.3. Molar conductivities of the complexes in methyl alcohol and pyridine solutions have been determined and the results indicate tha...
Comparing the infrared absorption spectra of the typical crystals of albite, orthoclase,nepheline of 4-coordinated Al~(3+) ions and spodumene, kyanite, beryl of 6-coordinated Al~(3+) ions with that of R_2O-Al_2O_3-SiO_2 system glasses, it has been found that in the glasses theAl~(3+) ions are 4-coordinated when R_2O/Al_2O_3>>1. But it is different in Li_2O-Al_2O_3-SiO_2glasses that the coordination number of part of Al~(3+) ions may be 6. No anomaly related to the presence of mixed alkali was fo...
The mechanism of chelate and synergistic extraction of Pb++,Ni++,Mn++,Co++ Cd+++,Ca++, Mg++ and La+++ ions with l-phenyl-3-methyl-4-benzoyl-pyrazolone-5(HPZL)-benzene and HPZL-TBP-benzene solution were investigated by the two-phase titration method. The composition of the extracted chelates and synergistic complexes and their stability constants have been determined. The experimental results showed that for the metal ions which are extracted strongly the synergistic effects are weaker, while the metal ions ...
coordination number
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