Four new 4d−4f heterometallic coordination polymers, namely, {[LnAg(DSPT)(mBDC)(H 2 O) 2 ]•H 2 O} n [Ln = Sm, (1); Ln = Er, (2); H 2 DSPT = 4′-(2,4-disulfophenyl)-2,2′:6′2″-terpyridine); H 2 mBDC = 1,3benzenedicarboxylic acid], {[CeAg(DPST)(mBDC)(H 2 O) 2 ]•H 2 O} n (3), and {[TbAg 3 (DPST) 2 (INC) 2 (H 2 O)]} n [HINC = isonicotinic acid, (4)], have been successfully synthesized under hydrothermal conditions and structurally characterized. The four components, including Ln(III) ions, Ag(I) ions, and the two organic ligands, are successfully incorporated into a single framework. They are all heterometallic complexes based on two kinds of molecular building blocks (MBBs), the Ag 2 (DSPT) 2 ring (MBB I) and Ln 2 (COO) 2 dimeric unit (MBB II). Complexes 1 and 2 are isostructural and exhibit a 2D network constructed by MBBs I and II, and further linked by Ag•••π interactions to a 3D supramolecular framework. Complexes 3 and 4 are 3D frameworks with sqc-21 and sqc-495 topologies by considering MBB I and II as nodes and coordination bonds/Ag•••O interactions as linkers. Complexes 1−4 represent rare examples of 4d−4f coordination polymers containing two kinds of organic ligands. Moreover, thermal gravimetric analysis and luminescence properties studies of selected complexes were also investigated.

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Five new coordination polymers, [Mg(5), were prepared under hydrothermal conditions. They are all complexes containing similar M 2 L 2 binuclear metal-terpyridine building units. Complex 1 is a discrete binuclear molecule that extends to 2D layers via O-H⋯O hydrogen bonds between coordinated water and a sulfo group on H 2 DSPT. Complexes 2 and 3 are 1D coordination chains based on [M 2 (DSPT) 2 ] ring subunits but are connected by different M-O bonds, and the 1D chains are also further connected by O-H⋯O hydrogen bonds between coordinated water and a sulfo group on H 2 DSPT to a 2D layer. Complex 4 exhibits a 2D coordination network also based on the [M 2 (DSPT) 2 ] ring subunits. Complex 5 is a by-product of the synthesis of complex 4 that displays a 1D coordination chain structure containing the same [M 2 (DSPT) 2 ] ring subunits. Interestingly, the 2D layers described above show identical skeletons when the bond types between [M 2 (DSPT) 2 ] ring subunits are neglected. The 2D layers in complexes 1-3 can be derived from replacing selected coordination bonds in complex 4 with hydrogen bonds, and such structural diversity is largely dependent on the number of coordinated water molecules around the metal center. Thermogravimetric analyses of 1-4 showed that they were stable at temperatures higher than 500 °C. The luminescent properties of complexes 1-4 were also investigated.

The small hive beetle (SHB), as one of the six major pathogens of honeybee, has invaded China in recent years and caused serious harm to the apiculture industry of China. In order to explore the feeding mechanism of Aethina tumida, we used scanning electron microscopy for the first time to conduct a detailed study on the morphology and structure of antennae and mouthparts, including the distribution and abundance of sensilla. The results showed that its clavate antennae and chewing mouthparts are similar to those of other nitidulid on the structure and types of sensilla. There are 5 types of sensilla were identified on antennae: 3 subtypes of sensilla chaetica (SC), 1 type of sensilla trichodea (SP), 6 subtypes of sensilla basiconica (SB), 2 subtypes of sensilla styloconica (SS) and 1 type of Böhm bristles (BB); 8 types of sensilla on mourthparts: 1 type of SC, 8 subtypes of SB, 2 subtypes of SP, 2 subtypes of SS, 1 type of SM, 1 type of sensilla coelocinica (Sco), 2 subtypes of campaniformia (Scam) and 1 type of BB. We also compared the differences of sensilla with the only reported nitiduline species Omosita colon and inferred their sensory function.