Homo/hetero-nuclear compounds

However, there is an important dass of gold compounds in which the formal oxidation state is intermediate between 0 and +1. They can be homo- or hetero-nuclear compounds and the nuclearity can range from 4 to 39 [38-41]. These compounds are available through several synthetic routes, which are mainly ... 

As follows from Fig. 4-1 and Fig. 4-2, the separation characteristics of graphitized thermal carbon black are unique. Graphitized carbon blacks are useful for analyzing cis-trans double bond isomers and positional isomers of multisubstituted aromatic (homo- and hetero-nuclear) compounds. Many examples of the separations are given in [36]. 

Homo- and hetero-nuclear cluster compounds of gold. K. P. Hall and D. M. P. Mingos, Prog. Inorg. Chem., 1984, 32,237 (225). 

The great recent development in electrochemical techniques will certainly be helpful for the study of redox processes of a metal which can occur in so many oxidation states. Multinuclear NMR spectrometers will allow increased use of 51V resonance as a routine method for the characterization of complexes in solution. Other recent developments are the study of polynuclear complexes, metal clusters (homo and hetero-nuclear) and mixed valence complexes, and it can be anticipated that these topics will soon become important areas of vanadium coordination chemistry, although the isolation of compounds with such complex... 

Polynuclear inorganic compounds exist in a bewildering array of structural types, such as ionic solids, molecular polymers, extended assemblies of oxounions both of metals and nonmeinis, nonmetal chains and rings, bridged melui complexes, and homo- and hetero-nuclcar clusters. This section treats primarily the nomenclature of bridged metal complexes and homo- and hetero-nuclear dusters. 

Laurie was one of the first to apply two-dimensional (2D) NMR to carbohydrates. With students Subramaniam Sukumar and Michael Bernstein, and visiting scientist Gareth Morris, he demonstrated and extended the application of many of the directly observed 2D NMR techniques of the time. These included the homo- and hetero-nuclear 2D /-resolved techniques, delayed proton /-resolved NMR that allowed broad resonances to be suppressed, for example, those of dextran in the presence of methyl /Lxvlopyranoside. proton-proton chemical shift correlation spectroscopy (COSY), nuclear Overhauser enhancement spectroscopy (NOESY), proton-carbon chemical shift correlation (known later as HETCOR), and spin-echo correlated spectroscopy (SECSY). Trideuteriomethyl 2,3,4,6-tetrakis-<9-trideuterioacetyl-a-D-glucopyranoside served as a commonly used model compound for these studies. 

NMR spectroscopy is a powerful analytical method for the determination of flavone structures. It has, however, some limitations as the sensitivity is rather low, and compounds have to be isolated. The assignments of the different proton and carbon signals in H and NMR can be based on chemical shifts (5) and coupling constants (J), and correlations observed in homo- and hetero-nuclear 2D NMR. NMR spectra of flavones have been extensively published previously (Markham and Chari, 1982 Agrawal, 1989 Markham and Geiger, 1993 Fossen and Andersen, 2006). 

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