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A discrete tetrahedral indium cage, {[In 12 (μ 3 -OH) 4 (HCO 2 ) 24 (tcma) 4 ]} (In 12 -GL), was synthesized solvothermally by the reaction of indium nitrate with the tripodal tricarboxylic acid ligand N,N,N-tris{(2′-carboxy[1,1′-biphenyl]-4yl)methyl}methylammonium chloride ([H 3 tcma] + Cl). This cage consists of four trimeric units [In 3 (μ 3 -OH)(μ 2 -CO 2 ) 3 (μ 2 -HCO 2 ) 3 ] and four [tcma] 2− ligands, which all perform as 3-connection nodes to bridge each other, resulting in a tetrahedral cage structure. The trimeric unit [In 3 (μ 3 -OH)(μ 2 -CO 2 ) 3 (μ 2 -HCO 2 ) 3 ] is observed for the first time in the family of In-based metal−organic structures and can be considered as an evolution of a 6-connected [In 3 (μ 3 -O)(μ 2 -CO 2 ) 6 ] unit. Each In 3+ is terminally coordinated by a μ 1 -HCO 2 group. This cage contains potential Lewis acidic/basic active sites endowed by In 3+ ions as Lewis acidic sites and the uncoordinated oxygen atoms of μ 1 -HCO 2 moieties as Lewis basic sites and was explored as an effective heterogeneous catalyst in the cycloaddition of CO 2 with epoxides and the Strecker reaction for amino nitriles. These catalytic reactions were deduced to happen on the surface of the In 12 -GL cage.

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Mixed metals alloy nanoparticles supported on carbon nanomaterial are the most attractive candidates for the fabrication of non‐enzymatic electrochemical sensor with enhanced electrochemical performance. In this study, palladium‐manganese alloy nanoparticles supported on reduced graphene oxide (Pd−Mn/rGO) are prepared by a simple reduction protocol. Further, a novel enzyme‐free glucose sensing platform is established based on Pd−Mn/rGO. The successful fabrication of Pd−Mn alloy nanoparticles and their attachment at rGO are thoroughly characterized by various microscopic and spectroscopic techniques such as XRD, Raman, TEM and XPS. The electrochemical activity and sensing features of designed material towards glucose detection are explored by amperometric measurments in 0.1 M NaOH at the working voltage of −0.1 V. Thanks to the newly designed Pd−Mn/rGO nanohybrid for their superior electrorochemical activity towards glucose comprising the admirable sensing features in terms of targeted selectivity, senstivity, two linear parts and good stability. The enhanced electrochemical efficacy of Pd−Mn/rGO electrocatalyst may be credited to the abundant elecrocatalytic active sites formed during the Pd−Mn alloying and the electron transport ability of rGO that augment the electron shuttling phenomenon between the electrode material and targeted analyte.