Structural phase diagrams and isomerism inflexible honeycomb-like 2D hydrogen bonded solid solutions.

Solid solutions of hydrogen bonded networks of the formula ((1-2H⁺)_3x(2-2H⁺)_3(1–x)([Fe(CN)₆]₂³⁻))·nH₂O, where (1-2H⁺) and (2-2H⁺) are bisamidinium H bond donor entities, have been prepared and structurally analysed. The H bonded systems display a honeycomb-like structure, and depending on the x value, three different tilings of the (6,3) system are observed, leading to three different phases. The precise location of the H bond donor cations (2-2H⁺) has been determined, evidencing H bonding between adjacent cations. The thermal properties of the solid solutions have been studied. [ABSTRACT FROM AUTHOR]