Molecules containing rare-earth atoms solely bonded by transition metals.

Valence, coordination number, and PAV cells in metallic rare earth compounds

— Polyhedral atomic volumes, Voronoi volumes, generalized coordination numbers, and Pauling's metallic valences are given for 24 intermetallic rare earth compounds. The results clearly indicate that as much as 33 % rare earth isovalent volume contraction can occur upon compound formation while the atomic volumes of aluminum and the transition elements are nearly constant. Earlier discussions of...

Sample pretreatment using chitosan-based chelating resin for the determination of trace metals in seawater samples by inductively coupled plasma-mass spectrometry.

A sample-pretreatment method using a chitosan-based chelating resin, ethylenediamine-N,N,N'-triacetate-type chitosan (EDTriA-type chitosan), was developed for the preconcentration of trace metals in seawater and separation of the seawater matrix prior to their determination by inductively coupled plasma-mass spectrometry (ICP-MS). The resin showed very good adsorption for transition metals and ...

Comparison of thermodynamics and kinetics of reaction of the ozone with mercury, silver and gold

In this work, we report results of calculations based on the density functional theory of different species metal-ozone, containing mercury, silver and gold. The chosen species range from small molecules and large transition-metal containing ozone with mercury, silver and gold complexes. A comparative analysis of the description of the metal-oxygen bond obtained by different methodologies is pr...

Cubane with a handle: [[In(3)As(4)Nb]-As](7-) in Cs(7)NbIn(3)As(5).

Compared to the large number of main group Zintl compounds there are only a few that contain transition metals.[1] This is not surprising since the traditional definition of Zintl phases automatically excludes transition metals. However, many such compounds with transition metals can qualify for Zintl phases when a broader definition is used. The latter includes compounds of transition metals w...

NUCLEIC ACIDS Nucleic acids are the repository of genetic information for life forms on planet Earth. They consist of linear molecules containing repeat units of: sugar (ribose or deoxyribose) - base