Self-Assembly of Four Coordination Polymers in Three-Dimensional Entangled Architecture Showing Reversible Dynamic Solid-State Structural Transformation and Color-Changing Behavior upon Thermal Dehydration and Rehydration
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https://figshare.com/articles/dataset/Self_Assembly_of_Four_Coordination_Polymers_in_Three_Dimensional_Entangled_Architecture_Showing_Reversible_Dynamic_Solid_State_Structural_Transformation_and_Color_Changing_Behavior_upon_Thermal_Dehydration_and_Rehydration/2267566
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资源简介：
A unique
three-dimensional (3D) supramolecular compound, [Co(dpe)(BTC)(H2O)][Co(dpe)(BTC)(H2O)3][Co(dpe)(HBTC)(H2O)][Co(dpe)2(H2O)3.5(EtOH)0.5]·1.5H2O (1; dpe = 1,2-bis(4-pyridyl)ethane
and H3BTC = benzenetricarboxylic acid), has been synthesized
and structurally characterized by the single-crystal X-ray diffraction
method. Compound 1 consists of four coordination polymers
(CPs), two are two-dimensional (2D) layered metal–organic frameworks
(MOFs) with (4,4) topology of [Co(dpe)(BTC)(H2O)]− and [Co(dpe)(HBTC)(H2O)], whereas the other two are one-dimensional
(1D) polymeric chains of [Co(dpe)(BTC)(H2O)3]− and [Co(dpe)(H2O)3.5(EtOH)0.5]2+. The 3D supramolecular architecture of 1 is constructed via the penetration of interdigitated double-layered
2D rectangular-grid frameworks by two 1D coordination polymeric chains
and entangled tightly by the subtle combination of intermolecular
hydrogen bonding and π–π interactions among the
four CPs. Controlled heating of the as-synthesized crystal 1 at ∼160 °C produces a desolvated 1 and
accompanying color-changing behavior from pink to deep-blue, and the
deep-blue desolvated 1 regenerates the pink rehydrated
crystal with the chemical formula of [Co(dpe)(BTC)(H2O)][Co(dpe)(BTC)(H2O)3][Co(dpe)(HBTC)(H2O)][Co(dpe)2(H2O)4]·3H2O (2) upon exposure to water vapor. The structural determination
of 2 shows almost the same structural characteristics
as that of 1 with the only difference being the replacement
of disordered coordinated solvent (half H2O and half EtOH
molecules) by H2O and the numbers of solvated water molecules.
The cyclic thermogravimetric analysis and powder X-ray diffraction
measurements of desolvated 1 demonstrate a reversible
rehydration/dehydration property, which is associated with solid-state
structural transformation and thermally induced UV–vis absorption
properties.
创建时间：
2014-08-06
