RESEARCH ON THE STRUCTURE AND REACTIVITY OF Mc_4Bzo_2[14] HEXAENATO(2-)N_4 METAL COMPLEXES Ⅱ. STUDY ON THE ELECTRONIC ABSORPTION SPECTRA OF ML AND MLX_x TYPE COORDINATION COMPLEXES
Two d-f heterometallic coordination complexes EuZn(C8H7O3)5(phen)(H2O)(1) and TbZn(C8H7O3)5(phen)(H2O)(2) were synthesized with hydrothermal reaction. These two complexes exhibit strong luminesecent emission.
In this paper,we synthesized the coordination complexes of water-soluble cellulose ethers/Eu(Ⅲ) with fluorescence emission,i. e. CMC/Eu(Ⅲ),MC/Eu(Ⅲ) and HEC/Eu(Ⅲ).
N, N-Diethyldithiocarbamate (dtc) as a ligand can combine with both molybdenum and the rare-earth elements to form dinuclear coordination complexes [Mo (dtc)4][Ln (dtc)4](Ln=La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Er). Their redox properties and the electrochemical characteristics were studied.
In the coordination complexes of the sample soil, whose concentration is 15mg/g, inhibitory effect on bacteria is 47%-63%, on mold is 23%-34%, and on soil-catalase is 9. 5%-38. 7%, dehydrogenase activity obviously decreases;
Novel C 2-symmetric chiral bis(oxazoline) ligands 1a~1f were synthesized. Their coordination complexes with Ti(OPr-i) 4 were applied in the diethylzinc addition to aldehydes with good yields and medial ee values (55%).
It has been established that during dehydration there are abrupt changes in the geometrical dimensions of the particles, caused by breakdown of coordination complexes between surface silicon atoms and water molecules.
A combination of transmission electron microscopy, X-ray diffraction, and infrared spectroscopy has been employed to study the nature of optical absorption of a transparent glass ceramic doped with Fe2O3.Glasses based on the Li2O-MgO-Al2O3-SiO2 system have the following wt% compositions: 65-75 SiO2, 2.8-4.8 Li2O, 18-24 Al2O3, 1.3-3.4 MgO.The factors which are chiefly responsible for the light absorption of the transparent glass-ceramic may be: the formation and growth of crystals, the formation of iron elec...
We have studied the mechanism of the polymerization of silicic acid in wide pH range. Experimental results showed that the cation of the added salts combined either with water forming aquo-metal ions or with the anion of silicic acid forming coordination complexes and thus giving rise to two different effects on the rate cf polymerization of silicic acid: electrostatic and chemical reaction.The relative degree of these two effects depends on the pH of the solution and the total cationic effect o...
In the presence of cetyltrimethylammonium bromide (CTMAB) sue ascorbic acid (AA) and chloroacetic acid (CAA) as auxiliary complexing agents, in the range of PH 0.9 to 1.6 pyrocatechol violet (PV) with tin (Ⅳ) formed a colour-producing reaction system of multicomponent coordination complexes PV-Sn (Ⅳ) -AA-CAA-CTMAB, the sensitivity for PV as a spectrophotometric agent is highest (ε_(662)=1.43×10~5L. mol~(-1). cm~(-1)). The compsition of complexes for the main component parts is Sn (Ⅳ):PV:CT...