The investigation into the substitution and addition chemistry of Re(sigma(2)-terpy)(CO)(3)Cl shows that the chloride in Re(sigma(2)-terpy)(CO)(3)Cl (1) may be substituted for acetonitrile to give [Re(sigma(2)-terpy)(CO)(3)(CH(3)CN)][PF(6)] (2), but in the cationic complex [Re(sigma(2)-terpyMe)(CO)(3)Cl][PF(6)] (4), where the pendant pyridine has been methylated, substitution of the chloride could not be achieved using standard conditions. However, use of [Re(sigma(2)-terpyMe)(CO)(3)I][PF(6)] (3) results in the formation of [Re(sigma(2)-terpyMe)(CO)(3)(CH(3)CN)][PF(6)](2) (5). The acetonitrile ligand in complex 2 was found to be labile and could be substituted by pyridine donors.

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An ortho­rhom­bic polymorph of sulfanilic acid monohydrate, C6H7NO3S·H2O, is described in which there are significant hydrogen‐bonding inter­actions between the components of the structure.

Key indicatorsSingle-crystal X-ray study T = 120 K Mean (C-C) = 0.002 Å R factor = 0.038 wR factor = 0.105 Data-to-parameter ratio = 14.6For details of how these key indicators were automatically derived from the article, see

Key indicatorsSingle-crystal X-ray study T = 150 K Mean (C-C) = 0.011 Å R factor = 0.061 wR factor = 0.125 Data-to-parameter ratio = 24.3 For details of how these key indicators were automatically derived from the article, see