Chemistry: Brevity for bonds

Metal-thiolate bonds in bioinorganic chemistry

Metal-thiolate active sites play major roles in bioinorganic chemistry. The M--S(thiolate) bonds can be very covalent, and involve different orbital interactions. Spectroscopic features of these active sites (intense, low-energy charge transfer transitions) reflect the high covalency of the M--S(thiolate) bonds. The energy of the metal-thiolate bond is fairly insensitive to its ionic/covalent a...

Context, Compositionality, and Brevity

Because of “arguments from the infinity of language”, compositionality is often seen as a ‘non-negotiable’ feature of any theory of the semantics of natural language. But there are a number of features of “ordinary language discourse” that make it seem that compositionality is not true of natural language semantics. Some of these features are lumped together under the rubric of ‘context’, and i...

The value of brevity.

The butterfly effect in chemistry : Bimodal M ~ S bonds ?

© Rzepa This article is distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and redistribution in any medium, provided that the original author and source are credited. I noted previously that some 8-ring cyclic compounds could exist in either a planararomatic or a non-planar-non-aromatic mode, the mode being d...

The Disilenes: Chemistry of Silicon-silicon Double Bonds

Three stable disilenes, Mes(R)Si=Si(R)Mes where R = mesityl, tert—butyl and (Me3Si)2N, have been prepared by photolysis of trisilanes and dimerization of the resulting ilylenes. X-ray crystallographic studies show Si=Si distances of "215 pm, about 20 pm shorter than for a Si—Si single bond. The silicon and attached carbon atoms are planar in the tert-butylmesityl compound but anti-pyramidal in ...