Framework isomers controlled by the speed of crystallization: different aggregation fashions of Zn(ii) and 1,2,4-triazol-3-amine, distinct (3,4)-connected self-penetrating nets, and various pore shapes

Abstract

In this work, we report two exceptional framework isomers, Zn(L)(bdc)_0.5·0.25H₂O (1, HL = 1,2,4-triazol-3-amine, H₂bdc = terephthalic acid) and Zn(L)(bdc)_0.5·0.17H₂O (2), where their formation is controlled by different speeds of crystallization. Further structural studies reveal that this operation of controlling the speed of crystallization may play a profound role in determining the aggregation fashions of Zn(II) ions and L⁻ ligands, resulting in the various layers, viz. a 4·8² net vs. a 4·6·12 net. Importantly, this work also presents two previously unobserved (3,4)-connected self-penetrating matrixes.