Pressure tuning between NH...N hydrogen-bonded ice analogue and NH...Br polar dabcoHBr complexes

Article Abstract:

A study to show that the polycationic H-bonded chains of dabcoH[Br.sup.6] are transformed into a different structure of H-bonded cations and anions by modest pressure of about 0.4 Gpa was conducted. The low-pressure triggering of this transformation has suggested that it is a possible source of defects in the real structure at normal conditions, where they can be responsible for anomalous dielectric properties, including relaxor-like behavior of NH...N hydrogen-bonded compounds.

Nitrogen Compounds, Hydrogen bonding, Hydrogen bonds

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Observation of triatomic species with conflicting aromaticity: Al[Si.sub.2-] and Al[Ge.sub.2-]

Article Abstract:

The electronic structure and chemical bonding of mixed triatomic clusters, AlC[Ge.sup.-], Al[Si.sub.2-] and Al[Ge.sub-] are studied by using photoelectron spectroscopy and ab initio calculations. The Al[Si.sub.2-] and Al[Ge.sub.2-] anions are the species with conflicting aromaticity, whereas AlC[Ge.sup.-] anion represents an interesting example of chemical species which is between classical and aromatic.

Aluminum Compounds, Aromatic compounds, Structure

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Site-selective spectroscopy of the solid-state defect chemistry in erbium-doped barium titanate

Article Abstract:

Erbium-doped barium titanate crystals studied by laser-induced florescence spectroscopy found thirteen spectroscopically distinct erbium ion sites. The relative concentrations of different sites changed as a function of the crystal and its preparation and treatment.

Barium Compounds, Spectra, Erbium

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