The molecular framework Ag(tcm) (tcm− = tricyanomethanide) expands continuously in two orthogonal directions under hydrostatic compression. The first of its kind, this negative area compressibility behaviour arises from the flattening of honeycomb-like layers during rapid pressure-driven collapse of the interlayer separation.
Cite
@article{arxiv.1311.6762,
title = {Negative area compressibility in silver(I) tricyanomethanide},
author = {Sarah A. Hodgson and Jasper Adamson and Sarah J. Hunt and Matthew J. Cliffe and Andrew B. Cairns and Amber L. Thompson and Matthew G. Tucker and Nicholas P. Funnell and Andrew L. Goodwin},
journal= {arXiv preprint arXiv:1311.6762},
year = {2015}
}