A new non-interpenetrated three-dimensional (3D) pillared-layered TPP-based LMOF [Zn3(TPyTPP)0.5(BDC)3]·8DMF (denoted as Zn-MOF 1) was successfully prepared (TPyTPP = tetrakis­(4-(pyridin-4-yl)­phenyl)­pyrazine and H2BDC = 1,4-benzenedicarboxylic acid). Zn-MOF 1 was characterized by single-crystal X-ray diffraction, PXRD, IR, N2 adsorption, thermogravimetric analysis, and luminescent spectrum. Impressively, luminescent sensing studies reveal that activated Zn-MOF 1 not only displays excellent luminescence-quenching efficiency with the values of high K sv and low LODs toward 5-hydroxytryptamine (5-HT) and 5-hydroxyindole-3-acetic acid (5-HIAA), respectively, but also possesses outstanding sensing characteristics in terms of fast response, high sensitivity, and specific selectivity. Zn-MOF 1 performs as efficient sensing of carcinoid biomarkers to provide a fresh detection platform for the diagnosis of carcinoids. In addition, the sensing mechanism was also explored on the basis of ultraviolet–visible (UV–vis) absorption, DFT calculations, and structural analysis.

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Herein we report that the reaction of the low-valent aluminum(I) species [Cp*Al] 4 (Cp* = pentamethylcyclopentadienyl) with CO 2 exhibits complete cleavages of the C�O bonds. The deoxygenating reduction reaction of [Cp*Al] 4 with CO 2 at 120 °C afforded [(Cp*) 3 Al 3 O 2 C(CO)] 2 (1), which featured two stacked (Al 3 O 2 C) 2 units and two C�C�O ketene moieties. Moreover, the isoelectronic analogues of diimine and isothiocyanate with CO 2 were also investigated, and the reactions of [Cp*Al] 4 with Dipp*-N�C�N-Dipp* and Dipp-C�N�S [Dipp* = 2,6-bis(diphenylmethyl)-4-tert-butylphenyl; Dipp = 2,6diisopropylphenyl] afforded dialuminylimine (2) and tetrameric [Cp*AlS] 4 (3), respectively.

Compared to crown ethers with functions to capture metal cation, inverse crown ethers (ICEs) with a similar cavity architecture have the alternating polarity of cationic metal ring and encapsulated ion to construct the skeleton. Here we introduce a new tridentate aryloxide‐N‐heterocyclic carbene ligand to stabilize μ4‐oxo [Mg4O] cores in ICEs, which open up a path towards synthetic methodology for ICEs. The reaction of N‐Heterocyclic carbene (NHC) lithium complex (L)Li2(L1) (1; L={1‐C(NDippCH2CH2N)}2(CH2)2PhO−, Dipp=2,6‐iPr2‐C6H3; L1=(SiMe3)2N−) with MgBr2 afforded a mixture of (L)Mg2Br3 (2), (L)2Mg4OBr4 (3) and (L)Mg4OBr5(THF)2 (4), via the salt metathesis. Symmetric 3 and unsymmetric 4 including the same μ4‐Oxo [Mg4O] unit possess ICEs character, where O2− atoms lie in the centroid binding to all four Mg2+ centers.