Coordination and organometallic compounds

5 -GMP with Ca(II) and 5 -CMP with Cd(II) and Mg(II) complexes have been studied using CPMAS NMR.  

Four polymorphic forms of nickel(II) and two of zinc(II) dibenzoylmethan-ates have been characterized with solid-state CPMAS NMR and other techniques. 

A gallium citrate complex (NFl4)3[Ga(C6H507)2]-4H20 has been studied by C CPMAS NMR. The number and intensities of the resolved resonances in the spectrum are found to be consistent with the X-ray structure. 

Natural abundance N CPMAS NMR has been shown to be a useful tool for investigating metal binding to nucleotides in the solid state. 

Dithiophosphate zinc(II) complexes with eight different 0,0 -dialkyldithio-phosphate ligands have been studied by means of CPMAS All 

V )-RNN=CPh2 R=CH2Ph, Ph) and ketimido (—N=C(Ph)(R) P=CI I2IT1, Ph) complexes of (C5Me5)2Th show an absence of a metal-based Th(IV)/Th(III) reduction process in contrast to the U(IV)/U(III) reduction that is observed in uranium derivatives. 

11 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 

Colorless and transparent aluminium phosphate gels and glasses with P/Al ratios ranging from 0.5 to 3.0 were prepared via the sol-gel process using aluminium lactate and phosphoric acid as precursors. 

---

Magnetic Properties of Organometallic and Coordination Compounds of Plutonium... 

Covalency and orbital reduction data, organometallic and coordination compounds.25-38... 

Head of the Department of Chemistry at the University of Siena since 1996, Professor Piero Zanello has more than 20years experience in electrochemistry of organometallic and coordination compounds. He has been part of numerous national and international research groups, and is a well-known lecturer and author of scientific papers. 

A variant on the ship-in-a-bottle approaches described above is to react a preformed catalyst with the zeolite framework. This is analogous to procedures developed for immobilizing organometallic and coordination compounds on surfaces, but occurs within zeolite pores. These compounds that have reacted with the external surface must be removed, along with those adsorbed on the surface, to produce a true single-site catalyst. Two examples, illustrating different synthetic approaches, are discussed below. 

King RB (2005) Polyhedral dynamics and the Jahn-Teller effect. In Gielen M, Willem R, Wrackmeyer B (eds) Eluxional organometallic and coordination compounds. Wiley, New York, pp 1-37... 

Apart from all of this, multi-dimensional NMR finds considerable and still growing applications in more traditional areas of chemistry. Even if most organometallic and coordination compounds are smaller in size and exhibit simpler spectra than biopolymers, they are composed of a large pool of building blocks whose spectroscopic characteristics are less well known or unknown at all, and the bond connectivity patterns are much more diverse and intricate. Consequently, NMR spectra of organometallic and coordination compounds are less predictable, and multi-dimensional techniques are in many cases indispensable as analytical tools when structural assignments derived from the analysis of one-dimensional NMR spectra remain ambiguous or even incomplete. 

Carbonylchlorocopper(I) (A) is a valuable precursor for the synthesis of organometallic and coordination compounds of copper(I). Previous methods11 utilizing water, tetrahydrofuran, methanol, or benzene as solvent may yield lower-purity products because copper(I) chloride is not soluble in these solvents without excess halide ligand. The synthetic method described here also provides a convenient way of growing large crystals of X-ray quality of carbonylchlorocopper(I). 

U. Belluco, The Organometallic and Coordination Compounds of Platinum, p. 108. Academic Press, New York, 1974. 

A new and promising matrix for less polar organometallics and coordination compounds is p-nitrophenyl octyl ether. 

The applications of SIMS to organometallic and coordination compounds have been pioneered by Cooks and Walton and their co-workers (83-90). They have used solid matrices, such as ammonium or sodium chlorides, to decrease the abundance of ions resulting from intermolec-... 

In photochemical reactions, the population of excited states of different orbital origins can result in quite different reactivity patterns. Therefore, reaction products may occur, which are not accessible at all in thermochemical pathways. Especially in organometallic and coordination compounds, the primary photoproducts obtained are not always resulting from the lowest-lying excited state levels. Wavelength-selective excitation may then be exploited to channel the product formation process and to control a possible branching between different reactivity patterns. 

M. I. Bruce Organometallic and coordination compounds, pp. 182-252 (466), covering the period 1968 through mid-1970. 

Vlcek, A., The Life and Times of Excited States of Organometallic and Coordination Compounds, Coord. Chem. Rev. 2000, 200, 933 977. 

Nowadays the borderlines between inorganic chemistry, organic chemistry and physical chemistry are vanishing, due to the enormous mutual interaction of these fields. Organometallic and coordination chemistry, as well as photochemistry, have been strong contributory factors in this "overlap process". Therefore, the photochemistry of organometallic and coordination compounds provides very specific examples of this general phenomenon. 

Sulfoxide ruthenium complexes have received attention in part from the fact that they are useful starting materials for new organometallic and coordination compounds and in part from their role in biology and catalytic processes see Metal-related Diseases of Genetic Origin). Potential applications are found in medicinal chemistry. 

Correlation of gas-phase ionization potential data with solntion redox potentials for series of organic, organometallic and coordination compounds " underlines the relationship between F( °o orbital energies. For example, Cr 3d binding energy data for the first ionization... 

Thus, from 1951, Cahn and Ingold, later associated with Prelog, defined a method for attributing absolute configuration based on a simple and universal principle, and we will now detail the application of this principle to organometallic and coordination compounds. In order to describe these compounds two systems are used ... 

The aim of this chapter is to discuss the recent examples of chiral recognition in organometallic and coordination compounds. Most of the examples presented are related to octahedral tris(bidentate) compounds with helical chirality. The homo-chiral... 

---