Abstract
The H coordinates are given for eight hydrated manganese chlorides, all of which become antiferro-magnetic at low temperatures. These coordinates are obtained from Baur's electrostatic model, and in the case of one compound (MnCl2·4H2O), from a precise three-dimensional neutron-diffraction study. The latter study appears to confirm the validity of Baur's model. The results indicate that the H bonds are normal bonds for all but three of the O–H- - -Cl bonds which are found severely bent.