Add time:07/21/2019         Source:sciencedirect.com

Acetoguanamine is an advantageous molecular precursor for a freshly identified N-H⋯O/N-H⋯N synthon, which is adequate for the design of novel multi-dimensional structures. Six compounds of acetoguanamine with various carboxylic acids pyridine-2,3-dicarboxylic acid 1, phthalic acid 2, 3,4,5-trimethoxybenzoic acid 3, 5-chloro-2-hydroxy-benzoic acid 4, 1,2,3,4-cyclopentane-tetracarboxylic acid 5, terephthalic acid 6, were synthesized and investigated. The N-H⋯O/N and C-H⋯O interactions bring about the formation of supramolecular aggregation patterns with rich structures. Compounds 1–4 are featured as 2D supramolecular structure while compounds 5 and 6 are novel 3D supramolecular aggregation patterns. Synthon strategy gives a major push to the construction of these six supermolecular compounds. The hetersynthon I R22(8) constructed by N-H⋯O/N+-H···O H-bond interaction between the deprotonated carboxyle and the protonated triazine is observed in all structures except 3. The homosynthon III R22(8) constructed by N-H⋯N H-bond interaction between acetoguanamine is observed in all structures except 2. What is worth mentioning, compounds 1 and 3–6 feature the 1D chain structures constructed by various synthons and in 3, 4 and 6 the chains are positioned into infinite 2D sheets. What's more, solvent molecule play a vital role in 4 and 6. Besides, the thermal stabilities of complexes 1–6 have been investigated.

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