Four novel Zn(II) metal–organic frameworks (MOFs) including {[Zn(L)_0.5(bimb)]·2H₂O·0.5(CH₃)₂NH}_n (1), {[Zn(L)_0.5(bimmb)]·2H₂O}_n (2), {[Zn(L)_0.5(btdpe)]·H₂O}_n (3), and [Zn(L)_0.5(bidpe)]_n (4) (H₄L = 5,5′-(1,4-xylylenediamino) diisophthalic acid, bimb = 1,4-bis(imidazol-1-yl)-butane, bimmb = 1,4-bis(imidazol-1-ylmethyl)benzene, btdpe = 4,4′-bis(4H-1,2,4-triazol-4-yl)diphenyl ether, and bidpe = 4,4′-bis(imidazolyl)diphenyl ether) were solvothermally prepared and further characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction, thermogravimetric (TG) analysis and powder X-ray diffraction (PXRD). Single-crystal X-ray diffraction analysis showed that complex 1 features a 3-fold interpenetrated bbf topological framework with the Schläfli symbol of (6⁴·8²)(6⁶)₂. Complex 2 displayed an unprecedented 2-nodal (4,4)-connected 3D framework with the Schläfli symbol of (8⁶), while complexes 3 and 4 showed 3-nodal (2,4,4)-connected (4·8·10⁴)₂(4)₂(8⁴·10·12)-unprecedented frameworks. Luminescence studies revealed that complexes 1–4 can be used as high selectivity luminescence sensors for sensing Fe(III) cations, Cr(VI) anions (Cr₂O₇ ²⁻ and CrO₄ ²⁻) and nitroaromatic compounds. Furthermore, a possible sensing mechanism was investigated in this paper.

Secondary metabolites generated by marine fungi have relatively small molecular weights and excellent activities and have become an important source for developing drug lead compounds. The review summarizes the structures of novel small-molecule compounds derived from marine fungi in recent years; introduces representative monomers in antimicrobial, antitumor, anti-viral, and anti-neuritis aspects; and discusses their biological activities and molecular mechanisms. This review will act as a guide for further discovering marine-derived drugs with novel chemical structures and specific targeting mechanisms. Graphical Abstract

Four novel Co(II) metal–organic frameworks, namely [Co₂(4,4′-cpmb)₂(1,1′-bbi)₂]_n (1), [Co(4,4′-cpmb)(4,4′-bbibp)]_n (2), {[Co(4,4′-cpmb)(tib)]·3(H₂O)}_n (3) and {[Co(4,4′-sdc)(tib)]·(H₂O)}_n (4) (flexible 4,4′-cpmb = 4-(4-carboxylphenylmethylthio)benzoic acid, rigid 4,4′-sdc = 4,4′-stilbenedicarboxylic acid, flexible 1,1′-bbi = 1,1′-(1,4-butanediyl)bis(imidazole), rigid 4,4′-bbibp = 4,4′-bis(benzoimidazo-1-ly)biphenyl and rigid tib = 1,3,5-tris(1-imidazolyl)benzene) were synthesized employing a rational design approach under solvothermal conditions and further characterized by elemental analysis, IR spectra, thermogravimetric (TG) analysis, powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction. The four Co-MOFs display different interpenetrated structures due to the flexibility of O/N-donor ligands. Single-crystal X-ray diffraction analysis reveals that complex 1 displays a 6-fold interpenetrating class Ia net with the point Schläfli symbol of (6⁶). Complex 2 shows a 3-fold interpenetrating sqc5 net with the point Schläfli symbol of (6⁶·8). Complexes 3 and 4 exhibit a 2-fold interpenetrating 4-connected sql topology with the point Schläfli symbol of (4⁴·6²). The photodegradation properties and dye adsorption capacity of complexes 1–4 are investigated, and the framework integrity of complexes 1–4 can be well-retained.

Covalent organic polymers (COPs) are a kind of promising material for carbon dioxide (CO₂) reutilization. Herein, a series of covalent organic crown-based polymers (COCP–H, COCP–OH, COCP–CH₃, COCP–Bu, COCP–NH₂) were designed and synthesized. These synthesized COCPs were characterized by FT-IR, SEM, BET and ¹³C CP MAS NMR. Notably, the novel COCP–OH catalyst with hydroxyl and crown ether groups on the framework simultaneously was particularly effective in cycloaddition reactions, giving a cyclic carbonate yield of 94.8% after 24 h at 70 °C with 1 bar of CO₂, using 0.0735 mmol of KI and 71 mg of COCP–OH. It is worth considering that there is a synergetic effect between the hydroxyl group and KI activated by the crown ether fragment, which plays a crucial role in accelerating the reaction rate. The coordinated interaction of crown ether with KI was also confirmed by X-ray photoelectron spectroscopy (XPS). Thus, this study provides a new approach to fabricate multifunctional COP materials for the coupling reaction of CO₂ under mild conditions.