In crystallo lattice adaptivity triggered by solid-gas reactions of cationic group 7 pincer complexes.

The group 7 complexes [M(κ3 -2,6-(R2 PO)2 C5 H3 N)(CO)2 L][BArF 4 ] [M = Mn, R = i Pr, L = THF; M = Re, R = t Bu, L = vacant site] undergo in crystallo solid-gas reactivity with CO to form the products of THF substitution or CO addition respectively. There is a large, local, adaptive change of [BArF 4 ] anions for M = Mn, whereas for M = Re the changes are smaller and also remote to the site of reactivity.