Characterization of a well-resolved acyclic methanol(water)5 heterohexamer in the solid state

A novel (CH3OH)(H2O)5 binary cluster is trapped in a photoluminescent silver(I) coordination polymeric host, [Ag2(bpp)2(H2O)(ssa)·4H2O·CH3OH]n (1, bpp = 1,3-bis(4-pyridyl)propane, H2ssa = 5-sulfosalicylic acid). The heterohexamer can be viewed as either a D5 water pentamer with a dangling methanol molecule or a combination of D4 tetrameric water and methanol–water heterodimer. This well-resolved heterohexamer may behave as a useful model helping us to further understand phase behavior of binary methanol–water system. The luminescent behavior of 1 was also discussed.