The product of the intermolecular ‘frustrated Lewis pair’ (FLP) B(C6F5)2(C6Cl5)/2,2,6,6-tetramethylpiperidine and H2 has been studied by single-crystal neutron diffraction. This is the first structurally characterised example of a geometrically unconstrained dihydrogen (H⋯H) bond within a hydrogenated FLP system.
![Graphical abstract: Structural and theoretical studies of intermolecular dihydrogen bonding in [(C6F5)2(C6Cl5)B]–H⋯H–[TMP]](http://hg.y866.cn/compound/lib/scimg/usr/1/C3CC45889J.jpg)
