Synthesis of Pillared-layer Metal-organic Frameworks from Anthracene Luminescent Linkers and Their Piezochromic Properties †

doi:10.7503/cjcu20190653

Abstract

Abstract:

Employing anthracene luminescent linker 9,10-bis[(E)-2-(pyridin-4-yl)vinyl]anthracene(BP4VA) and two kind of carboxylic acid linkers with different lengths, two metal-organic framework(MOF) structures, FDM-26 with pillared-layer network and FDM-27 with dia topology, were synthesized. Moreover, the piezochromic property of BP4VA-based pillared-layer structure FDM-22 was investigated. Applying external pressure to the single crystals of FDM-22, which feature intrinsic coordination defects due to the metal-linker coordination bond breakage during activation, the framework integrity remains. However, their luminescence spectra show red shift up to 60 nm. It is concluded that the piezochromic response is due to the accumulation of more coordination defects after the pressure is applied.

Key words: Metal-organic frameworks(MOFs), Pillared-layer, Luminescence, Piezochromic property

CLC Number:

O614

TrendMD:

QI Yi, LI Qiaowei. Synthesis of Pillared-layer Metal-organic Frameworks from Anthracene Luminescent Linkers and Their Piezochromic Properties ^†[J]. Chem. J. Chinese Universities, 2020, 41(3): 417.

Figures/Tables 6

Sample	FDM-26	FDM-27
Empirical formula	ZnC₃₀H₂₀NO₄	ZnC₅₀H₃₆N₂O₄
Formula mass	523.84	794.18
Crystal system	Monoclinic	Monoclinic
Space group	C2/c	Cc
a/nm	1.5359(2)	3.0720(6)
b/nm	2.7197(4)	0.64637(13)
c/nm	1.5903(2)	2.7698(5)
α/(°)	90	90
β/(°)	94.218(2)	105.709(3)
γ/(°)	90	90
Unit cell volume/nm³	6.6248(15)	5.2945(18)
Temperature/K	173	173
Z	8	4
Density/(g∙cm^-3)	1.050	0.996
Radiation type	Mo Kα	Mo Kα
μ/mm^-1	0.769	0.501
F(000)	2152.0	1648.0
Reflections collected	22549	13126
Independent reflections(R_int)	7154(0.0852)	6237(0.2156)
R₁, wR₂[I>2σ(I)]	0.0888, 0.2952	0.1277, 0.3354
R₁, wR₂(all data)	0.1291, 0.3267	0.2519, 0.4146
Goodness-of-fit	1.148	1.007
CSD No.	1966653	1966654

Fig.1 Two kinds of organic linkers(BPDC and SDC) were coordinated with the paddle-wheel SBUs to form the layer structures, respectively, which were further pillared by BP4VA pillars(A) and square grids with BPDC as edges were pillared with BP4VA to construct 2-fold interpenetrated FDM-22(B) and layers with SDC as edges were pillared with luminescent BP4VA to construct 4-fold interpenetrated FDM-26(C)

Fig.2 Me2-TPDC and BP4VA linkers were coordinated with Zn(Ⅱ) to form a 7-fold interpenetrated 3D network with dia topology(A) and single network structure of FDM-27(B)

Fig.3 PXRD patterns of the activated FDM-22 with different methods and their corresponding pressure-imposed structures(A) and the corresponding optical images(B)—(I) FDM-22(B), FDM-22S(C), FDM-22A(D) and FDM-22V(E) under 365 nm UV light. LSCM image of FDM-22 under 405 nm UV light(F); the optical images of FDM-22SP(G), FDM-22AP(H) and FDM-22VP(I) under 365 nm UV light.

Fig.4 Fluorescence spectra of FDM-22S and FDM-22SP(A), FDM-22A and FDM-22AP(B), FDM-22V and FDM-22VP(C) and FDM-22S and FDM-22SG(D), and their corresponding CIE chromaticity diagram[(E)—(H)]

Fig.5 Illustration of the pressure-induced structure transformation of activated FDM-22, which further results in luminescence change of the materials

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