Cationic Pb Dumbbells Stabilized in the Highly Covalent Lead Nitridosilicate Pb Si N.

Due to the weak oxidative force of N , nitrides are only typically formed with the less electronegative metals. Meeting this challenge, we here present Pb Si N , the first nitridosilicate containing highly electron-affine cations of a metal from the right side of the Zintl border. By using advanced synchrotron X-ray diffraction, the crystal structure was determined from a tiny single crystal of 1×3×3 μm in size, revealing a significantly different bonding situation compared to all other nitridosilicates known so far.

Targeting Vacancies in Nitridosilicates: Aliovalent Substitution of M (M=Ca, Sr) by Sc and U.

Based on the known linking options of their fundamental building unit, that is the SiN tetrahedron, nitridosilicates belong to the inorganic compound classes with the greatest structural variability. Although facilitating the discovery of novel Si-N networks, this variability represents a challenge when targeting non-stoichometric compounds. Meeting this challenge, a strategy for targeted creation of vacancies in highly condensed nitridosilicates by exchanging divalent M for trivalent M using the ion exchange approach is reported.

Fe Si N : Access to Open-Shell Transition-Metal Nitridosilicates.

Highly condensed nitridosilicates doped with Eu or Ce play an important role in saving energy by converting the blue light of (In,Ga)N-LEDs. Although nitridosilicates are known for great structural variety based on covalent anionic Si-N networks, elemental variety is restricted. Presenting a significant extension of the latter, this work describes a general access to open-shell transition-metal nitridosilicates.

Increased Synthetic Control-Gaining Access to Predicted Mg Si N and β-Ca Si N.

Nitridosilicates represent an intriguing class of materials and are typically made up of highly condensed tetrahedral network structures. Alkaline-earth nitridosilicates emerged as unique host materials for Eu doped luminophores which found broad application in phosphor-converted (pc)-LEDs. In contrast to common strategies of preparing nitridosilicates by bottom-up syntheses, we have now succeeded to post-synthetically design nitridosilicates by ion exchange in metal halide melts.

Redetermination of [EuCl2(H2O)6]Cl.

The crystal structure of the title compound, hexa-aqua-dichlorido-europium(III) chloride, was redetermined with modern crystallographic methods. In comparison with the previous study [Lepert et al. (1983 ▶).