CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Minqiang Gai,Tinghao Tong,Ying Wang,Zhihua Yang,Shilie Pan
By the selective fluorination of IO4 in iodates, SrI2O5F2 (SIOF) and Ba(IO2F2)2 (BIOF) were synthesized successfully. They are the first reported cases of alkaline-earth metal fluoroiodates, and the (IO3F)2– units in SIOF were discovered for the first time to the best of our knowledge. BIOF possesses the shortest UV cutoff edge (230 nm), and SIOF has the largest birefringence (cal. 0.203 at 532 nm) among the reported fluoroiodates. The highly polarizable (IO3F)2–, with high polarizability anisotropy, induces a large birefringence in SIOF by theoretical calculation. This work will contribute to enlarge the structural diversity and provide a good choice for the material design in fluoroiodates.
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 9
·5091-5105
·
IF 1.674
Shi Xiang,Shi Hongxin,Wu Hongke,Shen HaiMin
A series of novel fluoroether-containing monomers has been designed and prepared based on the commercially available perfluoroalkyl ether acid fluoride. Treating acid fluoride with allyl alcohol, 2-hydroxyethyl methacrylate or N -allylmethylamine allowed for the direct formation of corresponding vinyl-containing fluorinated monomers. High yields of the fluorinated epoxy monomers could be obtained from acid chloride with glycidol; meanwhile, fluorinated diol was prepared from diethanolamine or 3-amino-1,2-propanediol. Moreover, fluorinated monoamine, fluorinated monoalcohol and fluorinated dichloride were also obtained. Most of these fluorinated monomers were liquid at room temperature and exhibited good solubility in common organic solvents.
研究领域:
有机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Rong Zhang,Jian-Feng Sun
Along with the development of versatile trichromatic phosphors, the phosphors bridging the cyan gap between blue and green light have been an ongoing focus in simulating the full-visible-spectrum luminescence to satisfy the daily illuminating demands. Herein, an intriguing cyan-emitting phosphor Rb 2 CaPO 4 F:Eu 2+ belonging to the perovskite-type structural prototype was first time synthesized via the solid-state reaction. Structural analysis indicated that the typical Rb 2 Ca 0.90 PO 4 F:0.10Eu 2+ phosphor crystallizes in the orthorhombic structure with the space group of Pnma (62), and its cell parameters are equal to a = 12.913(5) Å, b = 5.989(4) Å, c = 7.440(1) Å, and V = 575.44(8) Å 3 . The fluorine-centered [FRb 4 Ca 2 ] octahedra interconnect with each other by sharing faces to build the one-dimensional perovskite-structure corrugated chains, which further connect with the [PO 4 ] tetrahedra to establish the structural framework of Rb 2 CaPO 4 F host. The electronic structure of Rb 2 CaPO 4 F matrix was studied by the first-principle calculation on the basis of the density functional theory, revealing an appropriate direct band of 4.76 eV. Pumped with the near-ultraviolet light, Rb 2 CaPO 4 F:Eu 2+ phosphor displayed a bright cyan emission covering from 400 to 600 nm with a broad FWHM of 142 nm. According to the Dexter theory, the concentration quenching mechanism of Eu 2+ -activated Rb 2 CaPO 4 F phosphor was classified as the dipole-dipole interaction. The Rb 2 CaPO 4 F:Eu 2+ phosphor not only exhibits a good thermal stability (I 443 K /I 298 K = 70%), but possesses a satisfactory internal quantum efficiency of 68% which is superior to most of the previously reported cyan-emitting phosphors. Consequently, it turns out that our perovskite-type Rb 2 CaPO 4 F:Eu 2+ phosphor can be considered as a promising candidate to fill the cyan gap toward the full-visible-spectrum light. The present work also demonstrates a great possibility for exploring the novel phosphors inspired by the mineral-type structural prototypes.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Ruiqin Gao,Mengfei Yu,Hui Xu,Lichun Li,Meng Deng,Yuxue Wu,Zhengfei Chen
Two-dimensional Ti2(PO4)2F nanosheets were synthesized with an ionic liquid (IL) containing PF6 ([Bmim]PF6) via a hydrothermal method. In comparison, only anatase titanium dioxide (TiO2) nanoparticles were obtained when changing the type of anion ([Bmim]Br or [Bmim]BF4) under the same conditions, suggesting that the anion type could greatly affect the crystalline phase, particle size, specific surface, and morphology of the final products; two-dimensional nanosheets were obtained in [Bmim]PF6, whereas nanocrystals with a relatively large surface were formed in the latter two ILs, as revealed by X-ray diffraction, nitrogen gas sorption, scanning electron microscopy, and transmission electron microscopy measurements. 1H and 19F nuclear magnetic resonance examinations of the fresh and recycled ILs suggest that the IL with the PF6 anion experienced complete hydrolysis, which could be the key factor for the formation of such unique Ti2(PO4)2F nanosheets. The electrochemical performances of such Ti2(PO4)2F nanosheets were evaluated as anode materials in lithium-ion batteries (LIBs) in comparison to TiO2 nanomaterials. The rate capability and cycling performance of the Ti2(PO4)2F electrode outperformed the other two electrodes studied, as illustrated by cyclic voltammetry curves, charge/discharge behavior, and long cycling test, which is mainly due its unique layered structure and low surface area, which resulted in low volume change. The Ti2(PO4)2F electrode derived from [Bmim]PF6 displays a steady reversible capacity of 170 mAh/g and high cycling stability with over 70% capacity retention after 100 cycles. The synthesis of the controllable crystalline phase and morphology of Ti2(PO4)2F nanomaterials with such ILs paves a useful route to prepare such alternative anode materials for LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Qianzhen Zhang,Ran An,Abudukadi Tudi,Jiongquan Chen,Xiaoqin Ma,Xifa Long,Zhihua Yang,Shilie Pan,Yun Yang
Developing new short-wavelength nonlinear optical (NLO) crystals has always been a significant and challenging area of research. Herein, guided by the cooperative optimization strategy, three new rare-earth metal borate fluorides, K 2 GdB 3 O 6 F 2 , Rb 2 LuB 3 O 6 F 2 , and Cs 2 LuB 3 O 6 F 2 , are rationally designed and fabricated by synergically assembling advantageous functional groups. Among them, a structural evolution from centrosymmetric K 2 GdB 3 O 6 F 2 to non-centrosymmetric Rb 2 LuB 3 O 6 F 2 and Cs 2 LuB 3 O 6 F 2 reveals that the [B 3 O 6 ] group contributes to the control of structural symmetry, owing to its sensitivity to the coordination of rare earth metal polyhedra. Notably, all the three title compounds exhibit short cutoff edges less than 200 nm, with Cs 2 LuB 3 O 6 F 2 displaying a large experimental frequency doubling effect of 1.5 × KH 2 PO 4 . The type-I shortest phase-matching wavelengths for Rb 2 LuB 3 O 6 F 2 and Cs 2 LuB 3 O 6 F 2 are evaluated to be 210 and 202 nm, respectively, indicating their potential for direct output of 213 coherent lights through a fifth harmonic generation process of Nd: YAG laser. This study provides new insights into the rational design and development of short-wavelength NLO materials by exploring the sensitivity of the [B 3 O 6 ] groups to the surrounding coordination environment, thereby fostering innovation in the field of NLO materials.
研究领域:
材料科学
·
无机化学
·
光学材料
·
非线性光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Tingyu Wang,Dan Wang,Bailiang Li,Ling Huang,Liling Cao,Xuehua Dong,Guohong Zou
Two antimony-based oxalofluoride crystals, (NH4)2Sb(C2O4)1.5F2·H2O (1) and (NH4)Sb(C2O4)F2·H2O (2), were synthesized via a solvent evaporation method. Both compounds feature a [SbO4F2]7– pentagonal pyramid and planar π-conjugated [C2O4]2– groups, interconnected through hydrogen-bond networks. They exhibit large birefringence values of 0.24 and 0.22 at 546 nm, respectively, along with wide optical band gaps of 3.93 and 3.75 eV. Combined experimental and theoretical analyses reveal that the pronounced optical anisotropy originates from the synergistic effect of stereochemically active lone-pair electrons, π-conjugated anions, and dense hydrogen bonding. This work provides a viable strategy for designing UV birefringent materials through cooperative structural modulation at the molecular level.
研究领域:
材料科学
·
无机化学
·
光学
·
晶体工程
·
理论化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）