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Crystal-to-Crystal Transformation and Linker Exchange in Cd(II) Coordination Polymers Based on Flexible Bis-pyridyl-bis-amide and 1,4-Naphthalenedicarboxylate

Abstract

Solvothermal reactions of Cd(II) salts and naphthalene-1,4-dicarboxylic acid (1,4-H2NDC) with bis(N-pyrid-3-ylmethyl)adipoamide, L1, and bis(N-pyrid-3-ylmethyl)suberoamide, L2, afforded three Cd(II) coordination polymers, {[Cd(L1)(1,4-NDC)(H2O)]·H2O}n, 1, {[Cd(L2)(1,4-NDC)]·2H2O}n, 2, and {[Cd2(L2)(1,4-NDC)2]·3H2O }n, 3, which have been structurally characterized by using single crystal X-ray crystallography. Complex 1 forms a 2D layer with the 44-sql topology, whereas 2 and 3 are 3D frameworks with the rare {32.62.72}{32.65.73}2-4,5T61 and the unique {32.54}{34.46.58.66.74}-sqc776 topologies, respectively. Complex 2 undergoes reversible crystal-to-crystal transformation with 3 upon solvent exchange, while irreversible structural transformations from 1 to 2 and 3 to 1 can be carried out by linker exchange. Reorientation of amide oxygen atoms that results in the change of the ligand conformation is proposed for the initiation of the crystal-to-crystal transformation. Complex 3 represents a unique example of coordination polymers that are able to proceed both crystal-to-crystal transformation and selective ligand exchange.

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Publication details

The article was received on 23 Aug 2019, accepted on 07 Nov 2019 and first published on 07 Nov 2019


Article type: Paper
DOI: 10.1039/C9CE01332F
CrystEngComm, 2019, Accepted Manuscript

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    Crystal-to-Crystal Transformation and Linker Exchange in Cd(II) Coordination Polymers Based on Flexible Bis-pyridyl-bis-amide and 1,4-Naphthalenedicarboxylate

    X. Yang and J. Chen, CrystEngComm, 2019, Accepted Manuscript , DOI: 10.1039/C9CE01332F

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