Divergent Chemistry Paths for 3D and 1D Metallo-Covalent Organic Frameworks (COFs)

The marriage of dynamic covalent chemistry (DCC) and coordination chemistry is a powerful tool for assembling complex architectures from simple building units. Recently, the synthesis of woven covalent organic frameworks (COFs) with topologically fascinating structures has been achieved using this approach. However, the scope is highly limited and there is a need to discover new pathways that can assemble covalently linked organic threads into crystalline frameworks. Herein, we have identified branching pathways leading to the assembly of three-dimensional (3D) woven COFs or one-dimensional (1D) metallo-COFs (mCOFs), where the mechanism is underpinned by the absence or presence of ligand exchange.     

On choosing state variables for piecewise-smooth dynamical system simulations

Nonlinear Dynamics - Choosing state variables in a state-space representation of a nonlinear dynamical system is a nonunique procedure for a given input–output relationship and therefore a...     

Organic Semiconducting Materials Based on BDOPV:Structures,Properties,and Applications

What are the major current research activities of your group?To develop high performance organic semiconducting and conducting materials and also to understand their structure-property relationships.We are also interested in the effect of the aggregation states of the con-jugated polymers on their electronic properties,the doping process and mechanism.What is the most important personality for scientific research?Curiosity and the desire to learn.Meanwhile,one should enjoy and be happy in the process of scientific exploration.     

UPLC-Q-Exactive/MS–based metabonomics revealed protective effect of Zingiberis rhizome and its processed product on deficiency-cold and hemorrhagic syndrome rats

Zingiberis rhizome carbonisata (ZRC) is the processed product of Zingiberis rhizome (ZR). ZR is mainly used for warming the spleen and stomach to dispel cold, whereas ZRC is commonly applied as a treatment for deficiency-cold and hemorrhagic syndrome (DCHS). Although they have long been used to serve different clinical purposes, the specific action mechanism of the drugs and molecular changes underlying ZR processing are not clear. In this study, metabolomics study was carried out to analyze the alterations in endogenous metabolites in serum and urine samples of DCHS rat models using ultra-high-performance liquid chromatography coupled with quadrupole-Exactive mass spectrometry technique and constructed principal component analysis score plots that showed that the ZRC group was completely separated from the DCHS and ZR groups but demonstrated a highly close plotting to the normal control group. The results revealed that both ZR and ZRC intervened in the metabolic pathways of DCHS models but to varying degrees and with different influencing factors. In addition, ZRC was found to function as a treatment for the metabolic disorders of DCHS through 15 pharmacodynamic biomarkers involving a series of pathways, such as glycine, serine, and threonine metabolic pathway, as well as arachidonic acid metabolic pathways. This study showed that metabolomics method based on ultra-high-performance liquid chromatography coupled with quadrupole-Exactive mass spectrometry could preliminarily illuminate the therapeutic mechanism of ZR and ZRC on DCHS and the changes in ZR processing from the molecular-level perspective. The results also provided new insight into further research on DCHS treatment.     

Improved partial response maximum likelihood method combining modulation code for signal waveform modulation multi-level disc

In this paper, we describe an improved adaptive partial response maximum likelihood （PRML） method combining modulation code tbr signal waveform modulation multi-level disc. This improved adaptive PRML method employs partial response equalizer and adaptive viterbi detector combining modulation code. Compared with the traditional adaptive PRML detector, the improved PRML detector additionally employs illogical sequence detector and corrector. Illogical sequence detector and corrector can aw）id the appearance of illogical sequences effectively, which do not follow the law of modulation code for signal waveform modulation multi-level disc, and obtain the correct sequences. We implement the improved PRML detector using a DSP and an FPGA chip. The experimental results show good performance. The higher efficient and lower complexity can be obtained by using the improved PRML method than by using the previous PRML method. Meanwhile, resource utilization of the improved PRML detector is not changed, but the bit error rate （BER） is reduced by more than 20%.     

Two Ni(II)/Cu(II) Coordination Polymer Constructed from Flexible Bisimidazole and Polycarboxyl Co-Ligands: Syntheses,Crystal Structures,and Thermal Stability

Crystallography Reports - Two metal coordination polymers, namely {[Ni(H2O)2(1,3-BIP)2] ? TFBDC}n (I), {[Cu3(H2O)4(1,3-BIP)6] ? (BTC)2 ? (H2O)15}n (II), (1,3-BIP is...     

2,3,4,5‐Tetraphenylsilole‐Based Conjugated Polymers: Synthesis,Optical Properties,and as Sensors for Explosive Compounds

A series of linear 2,5‐tetraphenylsilole‐vinylene‐type polymers were successfully synthesized for the first time. The tetraphenylsilole moieties were linked at their 2,5‐positions through a vinylene bridge with p‐dialkoxybenzenes to obtain polymer PSVB and with 3,6‐carbazole to obtain polymer PSVC . For comparison, 2,5‐tetraphenylsilole‐ethyne‐type polymer PSEB was also synthesized, in which the vinylene bridge of PSVB was replaced with an ethyne bridge. Very interestingly, the bridging group (vinylene or ethyne) had a significant effect on the photophysical properties of the corresponding polymers. The fluorescence peak of PSEB at 504 nm in solution originated from the emission of its silole moieties, whereas PSVB and PSVC emitted yellow light and no blueish–green emission from the silole moieties was observed, thus demonstrating that the emissions of PSVB and PSVC were due to their polymer backbones. More importantly, the 2,5‐tetraphenylsilole‐ethyne polymer exhibited a pronounced aggregation‐enhanced emission (AEE) effect but the 2,5‐tetraphenylsilole‐vinylene polymer was AEE‐inactive. Moreover, both AEE‐active 2,5‐tetraphenylsilole‐ethyne polymer and AEE‐inactive 2,5‐tetraphenylsilole‐vinylene polymers were successfully applied as fluorescent chemosensors for the detection of explosive compounds.     

Graphene preparation and process parameters by pre-intercalation assisted electrochemical exfoliation of graphite

Journal of Solid State Electrochemistry - Among all the preparation methods, electrochemical exfoliation of graphite in neutral aqueous solution to prepare high-quality graphene is a hot research...