Herein we reported two pseudo-polymorphs of 2,2’-dithiosalicylic acid (C14H10O4S2, DTSA) and trialkylamine with the existence of guanidinium[2C14H9O4S2- ·C+(NH2)3·[HN+(CH3)3] (1)[2C14H9O4S2-·C+(NH2)3·[HN+(C2H5)3] (2). In these two crystal structures that have the same space groups of P¯1, cell parameters, cell volumes and the contents of two asymmetric units are very similar. The only difference is the length of the carbon chains in two trialkyl ammonium cations. And the final stacking patterns of two structures are almost identical, in which two DTSAanions and one guanidinium form 3D channel-like composite host lattices with the help of varied hydrogen bonds and the only trialkyl ammonium is contained among the host lattices to yield the stable crystal structures with the existence of N-H…O interaction. Obviously, in the title compounds, these 3D channel-like host lattices composed of DTSA- anions and guanidinium can adjust their cavities to accommodate different guest molecules to generate the corresponding pseudopolymorphs.
Yang YX, Zhang LI, Li LH, Wen J and Ding KY