The role played by amine and ethyl group in the reversible thermochromic process of [(C2H5)2NH2]2CuCl4 probing by FTIR and 2D-COS analysis

Xie, Dongjin; Xu, Jing; Cheng, Haifeng; Wang, Nannan; Zhou, Qun

doi:10.1016/j.molstruc.2018.02.019

Cited by 8 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared with pristine pyridine molecules, the bands at 2900–3500 cm –1 of C 5 H 6 NMnCl 3 ·H 2 O apparently widen. Previous studies consider that the widening of these bands is associated with the formation of the H-bond interaction N/C–H···Cl . In addition, the relative transmittance of these bands for C 5 H 6 NMnCl 3 ·H 2 O is weaker than that for pyridine, which may reveal that the vibration of N–H and C–H in C 5 H 6 NMnCl 3 ·H 2 O are limited by H-bond interactions.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Previous studies consider that the widening of these bands is associated with the formation of the H-bond interaction N/C− H•••Cl. 34 In addition, the relative transmittance of these bands for C 5 H 6 NMnCl 3 Notably, a majority of H-bonds are prolonged with elevated temperature, while some are apparently shortened, as seen in Table S7. When roughly summing up the lengths of H-bonds along the c-axis, the average value at 300 K is 3.11 Å, shorter than that at 80 K (3.20 Å) (as listed in Table 1).…”

Section: H-bond and Hirschfeld Surface Analysismentioning

confidence: 99%

See 1 more Smart Citation

Hydrogen Bond-Driven Displacive Phase Transition and the Abrupt Optical/Magnetic Behavior in One-Dimensional Mn(II) Chloride Hybrid

Zhu,

Wu,

et al. 2024

J. Phys. Chem. C

View full text Add to dashboard Cite

Much efforts have been devoted to the research of hydrogen bonds (H-bonds) in metal halide hybrids for intriguing applications in optoelectronic devices, which plays a vital role in regulating structures and properties. Yet its temperature-dependent variation and the resulting magnetic/optical behavior have been barely investigated, especially for Mn(II) halide hybrids with spinrelated magnetism and photoluminescence (PL). This study focuses on C 5 H 6 NMnCl 3 •H 2 O with plenty of H-bonds. The enhanced H-bond interaction between pyridine rings and onedimensional (1D) chain of Mn(Cl/O) 6 octahedra along the c-axis (negative thermal expansion of lattice) results in a displacive phase transition when elevating temperature. The resulting more rigid lattice can efficiently suppress the vibration or rotation of pyridine rings and the nonradiative transition rate. It is also found that the ferromagnetic (FM) interaction between Mn 2+ and Mn 2+ does not cause significantly shortened decay lifetime of Mn 2+ emission as strong antiferromagnetic (AFM) interaction usually does. When ∠Mn−Cl−Mn in edged-shared octahedra deviates from 90°at elevated temperature, AFM becomes dominant over the FM interaction. Slightly varied temperature-dependent distance between Mn 2+ and Mn 2+ with AFM coupling likely leads to negligible thermal quenching. Thus, significant antithermal quenching of PL is achieved. This study sheds light on the relation of structureproperties concerning H-bond variation and helps design high-performance luminescent materials for optoelectronic devices.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Section: H-bond and Hirschfeld Surface Analysismentioning

confidence: 99%

Hydrogen Bond-Driven Displacive Phase Transition and the Abrupt Optical/Magnetic Behavior in One-Dimensional Mn(II) Chloride Hybrid

Zhu,

Wu,

et al. 2024

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

“…It indicates that the active groups on the surface of the particles have changed significantly. Additionally, two peaks emerged in the range of 2975-2845 cm −1 , corresponding to the vibrating doublet of methylene [19]. Moreover, an absorption peak existed at 3198 cm −1 , which was corresponding to the amine group [20].…”

Section: Surface Decoration Of Zrb 2 -Sic Particlesmentioning

confidence: 96%

Ablation Behavior of a Carbon Fabric Reinforced Phenolic Composite Modified by Surface-Decorated ZrB2/SiC

Zhu

et al. 2020

Materials

View full text Add to dashboard Cite

Carbon fabric reinforced phenolic composites were widely used as TPSs (thermal protection system) material in the aerospace industry. However, their limited oxidative ablation resistance restricted their further utility in more serious service conditions. In this study, the surface-decorated ZrB2/SiC and its modified carbon fabric reinforced phenolic composites have been successfully prepared. The self-modification mechanism of the surface-decorated ZrB2/SiC particles were characterized. The mechanical performance and ablation behavior of the composites were investigated. Results showed that the ZrB2/SiC particles possessed a good surface-decorated effect, which achieved good compatibility with the phenolic resin. The mechanical performance of the modified phenolic composite was effectively improved. The anti-oxidative ablation performance of the composite was improved. The mass ablation rate of the surface-decorated ZrB2–SiC-modified carbon fabric reinforced phenolic composites was 25% lower than that of the unmodified composites. The formed ZrO2 ceramic layer attached to the surface of the residual chars prevented the heat energy and oxygen from the inner material. Meanwhile, the volatilization of SiO2 and B2O3 effectively increased the heat dissipation. All these results confirmed that the ZrB2–SiC particles can effectively improve the ablation resistance of the composite, which provided a basis for the application of the composites to more serious service environments.

show abstract

Smart bistable coordination complexes

Xiao,

Chen,

Varley

et al. 2024

Smart Molecules

View full text Add to dashboard Cite

Smart molecules have attracted increasing attention due to their transformative role in creating the next generation of smart structures and devices. Smart bistable coordination complexes are a class of functional complexes which have two stable states that can be reversibly switched in response to external stimuli. Such bistable molecules play a vital role in various applications, such as sensors, data storage, spintronics, smart windows, optical switches, information encryption and decryption, displays, actuators, etc. Herein, the recent research studies into the development of these smart bistable metal coordination complexes are reviewed. According to the different external stimuli, these smart bistable coordination systems have been classified and summarized, including light‐responsive systems, thermally‐responsive systems, electrically‐responsive systems, mechanically‐responsive systems, and some other cases. These systems are further subdivided according to the changes in signals (e.g., color, fluorescence, spin state, crystalline phase) under external stimuli. The design principles of each type of smart bistable metal complexes as well as their broad and innovative applications are comprehensively described. Finally, the challenges and opportunities in this field are briefly analyzed and discussed.

show abstract

The role played by amine and ethyl group in the reversible thermochromic process of [(C2H5)2NH2]2CuCl4 probing by FTIR and 2D-COS analysis

Cited by 8 publications

References 24 publications

Hydrogen Bond-Driven Displacive Phase Transition and the Abrupt Optical/Magnetic Behavior in One-Dimensional Mn(II) Chloride Hybrid

Hydrogen Bond-Driven Displacive Phase Transition and the Abrupt Optical/Magnetic Behavior in One-Dimensional Mn(II) Chloride Hybrid

Ablation Behavior of a Carbon Fabric Reinforced Phenolic Composite Modified by Surface-Decorated ZrB2/SiC

Smart bistable coordination complexes

Contact Info

Product

Resources

About