Low-Barrier Hydrogen Bonds in Negative Thermal Expansion Material H 3 [Co(CN) 6 ]
The covalent nature of the low-barrier N−H−N hydrogen bonds in the negative thermal expansion material H 3 [Co(CN) 6 ] has been established by using a combination of X-ray and neutron diffraction electron density analysis and theoretical calculations. This finding explains why negative thermal expansion can occur in a material not commonly considered to be built from rigid linkers. The pertinen
