Synthetically important for introducing a picolyl scaffold into a molecular construction, alkali metallated picoline (methylpyridine) complexes are also interesting in their own right for the diversity of their ligand-metal bonding possibilities. Here the syntheses of seven new such complexes are reported: namely three 4-picoline derivatives 4-picLi·Me6TREN, 1, 4-picNa·Me6TREN, 2, and [4-picK·2...

Mechanical degradation and resultant capacity fade in high-capacity electrode materials critically hinder their use in high-performance rechargeable batteries. Despite tremendous efforts devoted to the study of the electro-chemo-mechanical behaviours of high-capacity electrode materials, their fracture properties and mechanisms remain largely unknown. Here we report a nanomechanical study on th...

A series of electronic and structural transitions are predicted in molten lithium from first principles. A new phase with tetrahedral local order characteristic of sp3 bonded materials and poor electrical conductivity is found at pressures above 150 GPa and temperatures as high as 1000 K. Despite the lack of covalent bonding, weakly bound tetrahedral clusters with finite lifetimes are predicted...

Glass sample of Zinc Lithium Bismuth Borate (25−x) Bi2O3:20Li2O:20ZnO:35B2O3:xPr6O11, (where x = 1, 1.5 and 2 mol%) has been prepared by melt-quenching technique. The amorphous nature of the prepared glass samples was confirmed by X-ray diffraction. The absorption spectra of three Pr3+ doped zinc lithium bismuth borate glasses have been recorded at room temperature. The observed optical spectra...

Suspended waveguides have been widely applied to silicon-on-insulator structures because they are easily fabricated with processing techniques similar to those of integrated circuit design. However, it is difficult to fabricate such structures in lithium niobate, which is also a very important material for optoelectronics. One main challenge is the difficulty of etching lithium niobate. In this...

Z. Naturforsch. 55 b, 1114-1120 (2000); received September 18, 2000 Lithium Phosphinomethanides, Lithium Benzyls The lithium dimethylphosphinomethanide with trimethylsilyl and 3,5-dimethylphenyl sub­ stituents in a position [Li(tmeda)2]+[C(PMe2)(SiMe3)C6H3-3 ,5-Me2]~ (2 ) was synthesized from Me2P-CH(SiMe3)C6H3-3 ,5-Me2 (1) and Li''Bu/tmeda in hexane in 56% yield (tmeda = N, N, N', iV'-tetramet...

AIM The aim of this study is to compare the shear bond strengths of conventional resin cement and self-adhesive resin cement bonded to lithium disilicate. MATERIALS AND METHODS A total of 40 extracted human molar teeth were mounted in self-cure acrylic resin. Teeth were prepared to obtain flat occlusal surface. About 40 lithium disilicate specimens of dimension-10 mm in diameter and thickness...

Lithium cyclopentadienyl derivatives are one of the most applied starting materials in organometallic synthesis. At the same time lithium organics with a C5 perimeter are certainly the most elaborated class of compounds in s-block organometallic chemistry. They are compounds par excellence to generate a huge variety of sandwich or half-sandwich d-block organometallics via transmetalation or sal...