Polymorphisms in M2+AlF5(H2O)7 (M2+ = Fe2+, Co2+, or Ni2+): Syntheses, Crystal Structures, and Characterization of New Mixed Metal Fluoride Hydrates

被引：0
|
作者：
Seo, Jun Min [1 ]
Jo, Hongil [2 ]
Choi, Myung Ho [2 ]
Ok, Kang Min [2 ]
Chang, Hong Young [3 ]
Kim, Sun Woo [1 ]
机构：
[1] Chosun Univ, Dept Chem Educ, Gwangju 61452, South Korea
[2] Sogang Univ, Dept Chem, Seoul 04107, South Korea
[3] Sul Ross State Univ, Dept Comp Math & Phys Sci CMPS, Alpine, TX 79832 USA
来源：
CRYSTALS | 2024年 / 14卷 / 02期
基金：
新加坡国家研究基金会;
关键词：
polymorphisms; fluorides; hydrothermal; hydrogen bonding; mixed metal; X-RAY; TRANSITION; BACOF4; ZN;
D O I：
10.3390/cryst14020197
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
Three new mixed metal fluoride hydrates, M2+AlF5(H2O)(7) (M2+ = Fe2+, Co2+, or Ni2+), were synthesized and characterized. The crystals of M2+AlF5(H2O)(7) were obtained using a hydrothermal method with a CF3COOH aqueous solution. The crystal structures displayed polymorphisms in C2/m (No. 12) or P-1 (No. 2) space groups, depending on temperature variations. The observed polymorphisms in M2+AlF5(H2O)(7) are associated with changes in the bonding environment of [M(H2O)(6)](2+) and [AlF5(H2O)](2-) octahedra, along with changes in hydrogen bonds and unit cell volumes. Infrared spectra and thermogravimetric analyses confirmed the presence of water molecules. The ultraviolet-visible spectra of M2+AlF5(H2O)(7) revealed distinctive absorption bands dependent on the [M(H2O)(6)](2+) complex. This work provides a detailed account of the synthetic procedure, crystal structures, and spectroscopic characterization of M2+AlF5(H2O)(7).
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页数：14
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