Two zinc(II) and cadmium(II) metal‐organic frameworks with mixed ligands, {[Zn2(biim‐4)2(TDC)2]·2.5H2O}n (1) and {[Cd2(biim‐4)2(TDC)2·2H2O]}n (2) [biim‐4 = 1,1′‐(1,4‐butanediyl)bis(imidazole); H2TDC = thiophene‐2,5‐dicarboxylic acid], were hydrothermally synthesized. Both of them are characterized by elemental analysis, IR spectroscopy, and single crystal X‐ray diffraction. In 1, the four‐connected ZnII nodes are connected by four linear ligands extending into a 3D network, which further integrates a fivefold interpenetrating diamond 3D topological network and the free water molecules distribute in void space, whereas in 2, the CdII ions are in a distorted octahedral arrangement linked by TDC2– and biim‐4 ligands to construct a 3D framework. In topology analysis, C11 and C14 are simplified as 3‐connected nodes and the 3D framework displays a (3,5)‐connected net. Furthermore, the thermal and photoluminescent properties of 1 and 2 were also studied.

Key indicatorsSingle-crystal X-ray study T = 298 K Mean (C-C) = 0.007 Å R factor = 0.039 wR factor = 0.107 Data-to-parameter ratio = 14.1 For details of how these key indicators were automatically derived from the article, see

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In the title compound, C23H16N2, the two bulky substituents, phenyl and 2‐phenyl­indolizin‐3‐yl are situated on the same side of the C=C double bond, resulting in an E configuration. This configuration minimizes the interatomic contacts. There are weak C—H⋯π inter­actions between neighboring mol­ecules related by an inversion center.