A novel complex [Ag(NIT3Py) 3 ] · (H 2 O)(ClO 4 ) has been synthesized and structurally characterized by X-ray diffraction methods. It crystallizes in the rhombohedral space group R-3. The structure consists of Ag(NIT3Py) 3 + moiety, one water molecule, and one perchloric ion. The Ag(I) ion is in a trigonal planar environment, which is formed by three nitrogen atoms from three NIT3Py. Variable temperature magnetic susceptibility measurements reveal the occurrence of weak ferromagnetic interactions in the compound.
Abstract Grant-free media access is vital for applications in Industrial IoTs (IIoTs), where stringent delays are required. Recently, due to the capability of supporting parallel receptions, Non-Orthogonal Multiple Access (NOMA) has gained research interests in IIoTs. Obviously, combining them organically is beneficial for enhancing the delay performances. In this paper, for a typical convergecast wireless network where its data sink is NOMA-based, we propose a grant-free MAC (Media Access Contention) scheme based on Compressive Sensing in Busy Tone Channel (CSiBTC), by exploiting the transmission sparsity in IIoTs. First, a to-be transmitter acquires the identities of active transmitters with the proposed CSiBTC scheme completely by itself. Two construction methods for CSiBTC are proposed for two distinct application scenarios respectively. Then, given the locations of all wireless sensors and the data sink in the network, the to-be transmitter can find out if it is eligible for starting its transmission without impairing the on-going transmissions. The scheme is grant-free and makes the most use of the parallel reception capability of NOMA, and therefore both the delay performance and throughput performance can be improved with respect to the general CS-based MAC. Performance evaluations also strongly support the above conclusions.
Two novel 12-connected 3D porous lanthanide–organic frameworks have been synthesized by the reaction of bipyridine-carboxylate ligand bpydbH2 and lanthanide metal ions. Both of them show a high proton conduction behavior as well as their composite membranes.
A metal-organic framework, {Zn3(BTB)2(μ3-OH)[(CH3)2NH2](H2O)}n (1), was synthesized based on H3BTB (1,3,5-tri(4-carboxyphenyl)benzene). An AC impedance test proves that 1 has a relatively high conductivity performance of 1.52 × 10-3 S·cm-1 at 338 K and 98% RH. The proton conductivity of the composite film 1@CS-9 (CS = chitosan) reaches 1.84 × 10-1 S·cm-1 at 328 K and 98% RH. In addition, 1 is discovered to have a good adsorption effect on iodine vapor, and the adsorption capacity reaches 726 mg·g-1. The multifunctionality caused by dimethylamine cations was investigated for the first time, which has implications for multifunctionality generated by host-guest molecules.
In the crystal structure of the title compound, C15H14N2O3, molecules are connected via weak intermolecular O—H⋯O and C—H⋯O hydrogen-bonding interactions, forming a zigzag form.
In recent years, the electrochemical reduction of carbon dioxide (CO2RR) has made many advances in C2+ production. Cu+/Cu0 site is beneficial for C‐C coupling process, but the oxidation state of copper cannot be well maintained during the reaction process, resulting in a decrease in catalyst activity. Based on this consideration, in this work, transition metal oxide CeO2 with a hollow cube structure and oxygen vacancies was introduced to stabilize and increase Cu+/Cu0 active sites (Ce1Cu2). The catalyst exhibits excellent CO2RR performance, with FEC2+ achieving 73.52% and jC2+ > 280 mA/cm2 at 1.26 V (vs. RHE). Ethanol is the main C2+ product and FEethanol reaches 39% at 1.26 V. The experimental results indicate that the presence of CeO2 provides a large number of oxygen vacancies and forming Cu+‐O2‐‐Ce4+ structure by the strong interaction of CeO2 and Cu NPs. The structure of Cu+‐O2‐‐Ce4+ and abundant oxygen vacancies lay a good foundation for the CO2 adsorption. Moreover, it increases the content of Cu+/Cu0 sites, effectively inhibiting hydrogen evolution reaction, promoting the C‐C coupling interaction, thereby facilitating the generation of C2+ products. The DFT theoretical calculation further demonstrates that Ce1Cu2 is more inclined towards the ethanol pathway, confirming its high selectivity for ethanol.
A metal organic coordination polymer based fluorescent probe was used to detect fipronil for the first time. Luminescence intensities of 1 continuously reduced with increasing concentrations of fipronil, and still showed high fluorescence intensity after four cycles.
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