Royal Society of Chemistry, CrystEngComm, 9(10), p. 1117
DOI: 10.1039/b807028h
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A new class of porous pillared-layer framework is exemplified by [Ln(H2O)n](m-BDTH) 3 9(H2O) (Ln = Pr, n = 9; Ln = Gd, n = 8) in which 2-D organic layers of p-stacked and hydrogen-bonded 1,3–benzeneditetrazol-5-ylate anions are separated by [Ln(H2O)n]3+ cationic pillars with lattice waters forming helical chains which involve planar water pentamers for the Pr compound.