Mercury hydride
Encyclopedia
Mercury hydride is a binary compound of hydrogen and mercury
Mercury (element)
Mercury is a chemical element with the symbol Hg and atomic number 80. It is also known as quicksilver or hydrargyrum...

. The Hg-H bond is very weak and therefore the compound has only been detected in matrix isolation
Matrix Isolation
Matrix isolation is an experimental technique used in chemistry and physics which generally involves a material being trapped within an unreactive matrix. A host matrix is a continuous solid phase in which guest particles are embedded. The guest is said to be isolated within the host matrix...

at temperatures up to 6 K. The dihydride HgH2 and the linear dimer HHgHgH have also been detected this way.
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