Synthesis, Structure and Luminescent Property of a 3D Layered-Pillared Cd(II) Metal–Organic Framework Derived from Mixed Rigid and Flexible Ligands


A new 3D Cd(II) metal–organic framework of [Cd2(HIDC)2(bibp)1.5]n (1) was synthesized hydrothermally by the reaction of imidazole-4,5-dicarboxylic acid (H2IDC) and 4,4′-bis(imidazol-1-ylmethyl)biphenyl (bibp) with Cd(NO3)2·4H2O. Single-crystal X-ray diffraction analysis reveals that this compound crystallizes in triclinic, space group Pī with a = 9.6610(3), b = 15.5866(5), c = 16.0228(6) Ǻ, α = 110.662(3), β = 101.521(3), γ = 107.115(3)˚, V = 2029.46(15) Ǻ3, Z = 2, Dc = 1.644 g cm−3, µ = 1.113 mm−1, F(000) = 1002, the final R1 = 0.0468 and wR2 = 0.0962 for 8932 observed reflections with I > 2σ(I). In 1, the alternately interconnection of Cd(II) ions by µ2-HIDC2− and µ3-HIDC2− anions resulted in the formation of 1D [Cd2(µ2-HIDC)(µ3-HIDC)] with the right- and left-helical chains, which were further linked by the oxygen atoms derived from one of the carboxylate groups of µ3-HIDC2− anions, generating the 1D double helical chain structure of [Cd4(µ2-HIDC)2(µ3-HIDC)2] along a axis. These adjacent 1D double chains are further linked by cis-µ2-bibp ligands to form a 2D network structure of [Cd4(µ2-HIDC)2(µ3-HIDC)2(cis-µ2-bibp)2]n, which are further pillared by trans-µ2-bibp ligands to generate a 3D layered-pillared metal–organic framework architecture of [Cd4(µ2-HIDC)2(µ3-HIDC)2(cis-µ2-bibp)2(trans-µ2-bibp)]n. Furthermore, the thermal stability and luminescent property of 1 have also been investigated.

Graphic abstract

A 3D Cd(II) layered-pillared metal–organic framework was synthesized hydrothermally. This new compound displays high thermal stability and intense fluorescent emission.

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This study is financially supported by the Natural Science Foundation of Guangdong Province (Nos. 2015A030313750 and 2016A030307048), Characteristic Innovation Projects Guangdong Provincial Department of Education (Natural Science Category, Nos. 2014KTSCX169 and 2018KTSCX208), and the Student Innovation and Entrepreneurship Training Program of China (201710576012). Dr. Tao Yang is supported by National Science Foundation of Guangxi (2018GXNSFAA281210).

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Correspondence to Wenguan Lu.

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Below is the link to the electronic supplementary material. CCDC 1843418 contains the supplementary crystallographic data for the compound 1. These data can be obtained free of charge via html, or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax:(+ 44) 1223-336-033; or e-mail:

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Wang, X., Shi, X., Yang, T. et al. Synthesis, Structure and Luminescent Property of a 3D Layered-Pillared Cd(II) Metal–Organic Framework Derived from Mixed Rigid and Flexible Ligands. J Chem Crystallogr 51, 50–56 (2021).

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  • Metal–organic framework
  • Synthesis
  • Crystal structure
  • Luminescent property