Chemical analysis with coordination compounds

Dimercury(I) n complexes are formed between aromatic compounds and Hg2(AsF6)2 in liquid S02 as solvent.113,121 Insoluble complexes with the ratio arene Hg2+ = 1 1 (arene = benzene, naphthalene, 2-methylnaphthalene, 2,6-dimethylnaphthalene, acenaphthene, fluor-anthrene, phenanthrene, anthracene, 9,10-dimethylanthracene or 1,3-dinitrobenzene) or 1 2 (arene = 9,10-benzophenanthrene) have been characterized by elemental analysis and, in some cases, by Raman spectrometry.113,120 The 13CNMR data allow the estimation of formation constants for the hexamethylbenzene, p-xylene and 1,4-dichlorobenzene complexes together with the chemical shifts for the bound substrates in these cases.121 Probably the coordination compounds of dimercury(I) salts with carbazole, dibenzofuran and diben-zothiophene are also n complexes.122... 

Water could play a structure-directing role in the synthesis of microporous compounds, but such examples are very rare. The most remarkable one is the synthesis of VPI-5 by using dipropylamine as SDA.[111] However, chemical analysis indicated that the organic amine content in the framework of VPI-5 is very small (about one dipropylamine molecule/2.5 cells). The channels of VPI-5 were filled with a large number of water molecules instead of dipropylamine molecules. There are 7 water molecules in one cell of VPI-5. Two of them (I, II) coordinated to the A1 atom in the framework, and four of them (III-VI) formed three helical water molecule chains in the 18-membered-ring channel of VPI-5 via intermolecular H-bonds. These three helical water molecule chains connected all 6-coordinated A1 atoms. The last water molecule (VII) was located in the center of the channel. Therefore, it was proposed that these water molecules played a structure-directing role in the creation of the framework of VPI-5. The synthesis of VPI-5... 

From on-line coupled TG-MS and TG-FTIR measurements, in combination with quantitative chemical analysis, the chemical formula for an unknown bismuA oxalate compound was deduced to be Bi(NH4)(C204)2 3.71(6)H20 by Vanhoyland et al. [78], Solution of the crystallographic structure on the basis of X-ray powder data proved this formula to be correct. Bi is 8-fold coordinated by oxygen from the oxalate anions. Because these BiOg polyhedra do not share any edges or vertexes, an open framework is formed with water and ammoniiun molecules between. As a result, water can easily be removed, which is clearly indicated by the rapid initial mass loss in the TG cxu e. 

Organometallic and Coordination Compounds. - Crystallization of ferrocene and ruthenocene substituted in the 1- and T-positions by two nitronyl nitroxide radicals gave the new crystal phases p-1 (besides the known phase a-1, a-2, and a-2 whose structures were determined by X-ray analysis and were investigated by C and H NMR spectroscopy with MAS NMR. The solid state Sn CP MAS NMR spectra of a series of triaryltin chlorides of the form ArsSnCl have been acquired. The indirect spin-spin coupling constants (J( Sn- C1)), quadrupolar-dipolar shifts (6( Sn- Cl)), and the Sn chemical shift tensors were extracted. " Powders of the zinc and copper(II) dimethyl-(MDtc), diethyl-(EDtc), and morpholinedithiocarbamate (MfDtc) complexes quantitatively absorb hexamethyleneimine (Hmi) to produce the adducts... 

This new technique of chemical ionization is based on the formation of charged complexes with silver or other transition metal ions, producing stable coordination compounds with olefinic compounds that can be detected by MS. The use of silver ions with CIS-MS proved to be a useful technique for the analysis of complex lipid oxidation products, which readily form Ag+ coordination... 

An inorganic molecule that contains several atoms, including one or more metal atoms, is called an inorganic complex or coordination compound. An example is nickel tetracarbonyl, Ni(CO)4. An inorganic complex with an electric charge is called a complex ion. Familiar examples of complex ions are the ferrocyanide ion, Fe(CN)e - the ferricyanide ion, Fe(CN)e the hydrated aluminum ion, A1(H20)6, and the deep blue cupric ammonia complex ion, Cu(NH3)4 +, which is formed by adding ammonium hydroxide to a solution of cupric salt. Complex ions are important in the methods of separation used in qualitative and quantitative chemical analysis and in various industrial processes. 

In brief, network analysis in the sense employed in this work deals with the network topology of crystalline compounds that can be described as 2D or 3D nets. There are no particular criteria in terms of chemical bonding or chemical constituents DNA, proteins, organic molecules, or coordination compounds can construct the net, but two things are essential ... 

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