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Two new polyoxometalate (POM)-based hybrid compounds modified by a Schiff base, [Fe-(DAPSC)(H 2 O) 2 ] 2 [HPMo 2 V Mo 10 VI O 40 ] • 5H 2 O (1) and [Fe(DAPSC)(H 2 O)] 2 [HPV 3 IV Mo 4 V Mo 7 VI O 42 ] • 6H 2 O (2), (DAPSC = 2,6diacetylpyridine bis-(semicarbazone)), have been successfully constructed from typical Keggin POMs, iron ions, and DAPSC ligands under hydrothermal condition. Structural analysis demonstrates that the Fe-Schiff base ligand units are free from polyacid anions in compound 1. While in compound 2, the Fe-Schiff base ligand units are bridged with polyacid anions via FeÀ O bonds to emerge a stable double-supported skeleton. Noticeably, owing to the introduction of vanadium in H 5 PMo 10 V 2 O 40 • 32.5H 2 O, a divanadium-capped configuration is shaped in compound 2. Besides, the third-order nonlinear optical (NLO) properties of two compounds were explored. It should be noted that both compounds 1 and 2 have twophoton absorption properties, which indicates that the two compounds are potential nonlinear optical materials.

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Ion–conducting ceramic membranes, such as mixed oxygen ionic and electronic conducting (MIEC) membranes and mixed proton–electron conducting (MPEC) membranes, have the potential for absolute selectivity for specific gases at high temperatures. By utilizing these membranes in membrane reactors, it is possible to combine reaction and separation processes into one unit, leading to a reduction in by–product formation and enabling the use of thermal effects to achieve efficient and sustainable chemical production. As a result, membrane reactors show great promise in the production of various chemicals and fuels. This paper provides an overview of recent developments in dense ceramic catalytic membrane reactors and their potential for chemical production. This review covers different types of membrane reactors and their principles, advantages, disadvantages, and key issues. The paper also discusses the configuration and design of catalytic membrane reactors. Finally, the paper offers insights into the challenges of scaling up membrane reactors from experimental stages to practical applications.

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