链穿梭聚合制备聚烯烃嵌段共聚物的研究进展

综述了链穿梭聚合的最新研究进展.包括链穿梭聚合的基本原理,在制备"软、硬"嵌段共聚物、两嵌段共聚物和立体嵌段聚丙烯方面的应用,以及和其他聚合方法的比较。链穿梭聚合是一种很有前景的聚合方法。

Synthesis, Structure and Photoluminescence of One Zinc-based Metal-metallosalen Framework

Dicarboxyl-functionalized salen ligand 1,2-phenylendiamine-N,N＇-bis（3-tert-butyl-5-（carboxyl）-salicylide-ene （HAL） was synthesized in good yield from 3-tert-butyl-5-formyl-4-hy- droxybenzoic acid and used to construct a 2D zinc complex, [（ZnL）Zn3/2（BDC）1/2（DMSO）2]·3DMSO （1, BDC = 1,4-benzenedicarboxylate）, under mild reaction conditions. 1 was characterized by IR, microanalysis, TGA and single-crystal X-ray crystallography. It crystallizes in triclinic space group P^-1 with a = 11.3860（4）, b = 13.2636（5）, c = 17.5503（7） A, α = 92.2240（10）, β = 94.5070（10）, γ = 96.0580（10）°, V= 2624.52（17） A^3, Z = 2, Mr = 1143.62, Dc = 1.448 g/cm^3, F（000） = 1186, g = 1.395 mm^-1, GOOF = 0.993, the final R = 0.0380 and wR = 0.1280 for 21752 observed reflections with I 〉 20（I）. The 2D coordination polymer 1 is further assembled into a 3D supramolecular network structure via π…π interactions between the aromatic rings of the ligands in adjacent layers. Thermal gravimetric analysis demonstrates that 1 is a thermally robust structure with network decomposition temperatures of 420 ℃ and it also exhibits strong photoluminescence in the visible region.

Stimuli-responsive coordination polymers toward next-generation smart materials and devices

Stimuli-responsive coordination polymers(CPs)are among one of the most prolific research areas in developing the next-generation functional materials.Their capability of being accurately excited by particular external changes with pre-determined and observable/characterizable behaviors correspond,are the so called“stimuli”and“responsive”.Abundant types of CP compounds,especially metal-organic frameworks(MOFs),are of rocketing interest owing to their compositional diversity,structural tunability,and in essence their highly engineerable functionality.This present review is aimed to sketch several common types of stimulation and the corresponding responses for CPs,accompanied with the broad logic and mechanisms underneath.And further from the aspect of material revolution,some representative progresses together with the latest advances of CP-based materials in various fields are covered in attempt to display a broader picture towards the possible prospects of this topic.

1D p-type molecular-based coordination polymer semiconductor with ultrahigh mobility

One-dimensional(1D)semiconductor nanostructures exhibit exceptional performance in mitigating short-channel effects and ensuring low power consumption.However,the scarcity of high-mobility ptype 1D materials impedes further advancement.Molecular-based materials offer high designability in structure and properties,making them a promising candidate for 1D p-type semiconductor materials.A molecular-based 1D p-type material was developed under the guidance of coordination chemistry.Cu-HT(HT is the abbreviation of p-hydroxy thiophenol)combines the merits of highly orbital overlap between Cu and S,fully covered surface modification with phenol functional groups,and unique cuprophilic(Cu-Cu)interactions.As such,Cu-HT has a remarkable hole mobility of 27.2 cm2V-1s-1,which is one of the highest reported values for 1D molecular-based materials to date and even surpass those of commonly used amorphous silicon as well as the majority of 1D inorganic materials.This achievement underscores the significant potential of coordination polymers in optimizing carrier transport and represents a major advancement in the synthesis of high-performance,1D p-type semiconductor materials.?2024 Science China Press.Published by Elsevier B.V.and Science China Press.All rights are reserved.

Acid-degradable gadolinium-based nanoscale coordination polymer： A potential platform for targeted drug delivery and potential magnetic resonance imaging

During conventional chemotherapy for cancer, nonspecific drug distribution, which causes serious side effects in normal tissues, is a serious limitation. Thus, it is desirable to develop a tumor or intracellular microenvironment-responsive nanosystem for targeted and on-demand drug release. In the present study, we engineered an intelligent pH-activatable nanosystem, in which a gadolinium- doxorubicin-loaded nanoscale coordination polymer （Gd-Dox NCPs） was the core and hyaluronic acid was the targeting shell. Taking advantage of CD44 receptor-mediated recognition, the nanoparticles were internalized selectively into human cervical carcinoma （HeLa） cells, and trapped within acidic compartments where the fluorescence of Dox recovered, along with the acid dismantling of the Gd NCPs, allowing real-time monitoring of drug release. In vitro experiments also showed that the Gd NCPs present enhanced T1 signals after acid-triggered degradation, suggesting their potential use as contrast agents for magnetic resonance imaging. Such nanocarriers, which feature high biodegradation, selective targeting ability, and rapid response to stimulus, demonstrated enhanced therapeutic efficacy in targeted cancer cells and ＂turned on＂T1 signals in vitro, showing great promise for diagnosis and treatment.