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Issue 44, 2020
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Structural diversity and modification in Ni(ii) coordination polymers: a peculiar phenomenon of reversible structural transformation between a 1D ladder and 2D layer

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Abstract

Reactions of metal(II) salts (M = Cd, Ni and Zn) with 5-tert-butylbenzene-1,3-dicarboxylic acid (5-tert-H2IPA) and N,N′-bis(3-pyridyl)terephthalamide (L1) or N,N′-bis(4-pyridyl)terephthalamide (L2) afforded {[Cd(L1)(5-tert-IPA)(H2O)]·2H2O}n, 1, {[Ni(L1)1.5(5-tert-IPA)(H2O)2]·2.5H2O}n, 2, {[Ni(L1)(5-tert-IPA)(CH3OH)]·2CH3OH}n, 3, [Zn(L1)0.5(5-tert-IPA)]n, 4, and {[Ni(L2)(5-tert-IPA)(H2O)]·2H2O}n, 5, which have been structurally determined by using single-crystal X-ray diffraction. Complexes 1 and 2 are 1D ladders with the {4·84·12}{4}{8}-2,2,4C1 and {82·12}2{8}3-2,2,3C4 topologies, and 3 and 5 are 2D layers showing {84·122}{8}2-2,4L2 and {44·62}-sql topologies, respectively, while complex 4 exhibits a 3-fold interpenetrated 3D net with the {42·6·102·12}{42·6}-coe-3,4-C2/c topology, which can be further simplified as the {65·8}-cds topology, indicating that solvents and metal identity play important roles in determining the structural diversity. Moreover, complexes 2 and 3 display a reversible structural transformation upon coordination as well as co-crystallized solvent exchange between H2O and CH3OH, which can be ascribed to the alternations of the bonding modes of the 5-tert-IPA2− ligand upon solvent attack, together with the conformation changes of the L1 ligand. Their thermal decomposition and the luminescence properties of 1 and 4 are also discussed.

Graphical abstract: Structural diversity and modification in Ni(ii) coordination polymers: a peculiar phenomenon of reversible structural transformation between a 1D ladder and 2D layer

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Submitted
10 Aug 2020
Accepted
10 Sep 2020
First published
10 Sep 2020

CrystEngComm, 2020,22, 7565-7574
Article type
Paper

Structural diversity and modification in Ni(II) coordination polymers: a peculiar phenomenon of reversible structural transformation between a 1D ladder and 2D layer

C. Chen, W. Lee, J. Hu, P. Mahat Chhetri and J. Chen, CrystEngComm, 2020, 22, 7565
DOI: 10.1039/D0CE01170C

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