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This article reports three versatile drug carriers based on two-dimensional supramolecular crystal sponges of ([(H2O)ML]2+, M=Co, Zn, Cu), which self-assemble through hydrogen bonding and pi-pi stacking to form layered structures with controllable hexagonal pores. Three parent crystal sponges ([(H2O)CoL]& sdot;(ClO4)2 & sdot;(H2O)6 & sdot;(CH3OH) (1), [(H2O)ZnL]& sdot;(ClO4)2 & sdot;(H2O)5 & sdot;(CH3OH) (2), and [(H2O)CuL]& sdot;(ClO4)2 & sdot;(H2O)3(CH3OH)3 (3)) were successfully synthesized via the coordination reaction between metal salt M(ClO4)2 and tris (2-benzimidazolylmethyl) amine ligand (L). The pore sizes and symmetries of these sponges are variable depending on the metal ions. These materials can selectively accommodate guest molecules of different sizes through hydrogen bonding, including methanol and large drug molecules such as ibuprofen (HIbu), ibuprofen methyl ester (MeOIbu), and indomethacin methyl ester (MeOInd). The accommodation of drug molecules in the cavities may alter the host layered structures. The configuration of [(H2O)CoL]2+ in [(H2O)CoL]& sdot;(HIbu)0.5 & sdot;(ClO4)2 & sdot;(H2O)1(CH3OH)1.33 (4) which accommodates HIbu is slightly different from that in 1. The structures of [(H2O)CoL]& sdot;(MeOIbu)0.5 & sdot;(ClO4)2 & sdot;(CH3OH)0.75 (5) and [(H2O)ZnL]& sdot;(MeOIbu)0.5 & sdot;(ClO4)2 & sdot;(H2O)0.5 & sdot;(CH3OH) (6) that accommodate MeOIbu are almost the same to those of 1 and 2, respectively, while the stacking of the host layered structures in [(H2O) CuL]2 & sdot;(MeOIbu)& sdot;(ClO4)4 & sdot;(H2O)6 (7) and [(H2O)CuL]2 & sdot;(MeOIbu)& sdot;(ClO4)4 & sdot;(H2O)8 (8) that also accommodate MeOIbu are completely different from that of 3. Despite that the structure of [(H2O)ZnL]2 & sdot;(MeOInd)& sdot; (ClO4)4 & sdot;(H2O)3 & sdot;(CH3OH)2 (9) which carries MeOInd is the same to that of 3, the stacking of the host layered structure of [(H2O)CuL]2 & sdot;(MeOInd)& sdot;(ClO4)4 & sdot;(H2O)5 & sdot;(CH3OH) (10) carrying MeOInd is different from that of 3. Our results developed a new type of supramolecular self-assemblies for drug carrying and delivery, and may provide important insights into the design of supramolecular drug carriers.
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JOURNAL OF MOLECULAR STRUCTURE
ISSN: 0022-2860
Year: 2025
Volume: 1343
4 . 0 0 0
JCR@2023
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 0