Polymorphisms in <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> (<i>M</i><sup>2<i>+</i></sup> = Fe<sup>2+</sup>, Co<sup>2+</sup>, or Ni<sup>2+</sup>): Syntheses, Crystal Structures, and Characterization of New Mixed Metal Fluoride Hydrates
Three new mixed metal fluoride hydrates, <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> (<i>M</i><sup>2+</sup> = Fe<sup>2+</sup>, Co<sup>2+</sup>, or Ni<sup>2+</sup&...
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MDPI AG
2024-02-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/14/2/197 |
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| author | Jun Min Seo Hongil Jo Myung Ho Choi Kang Min Ok Hong Young Chang Sun Woo Kim |
| author_facet | Jun Min Seo Hongil Jo Myung Ho Choi Kang Min Ok Hong Young Chang Sun Woo Kim |
| author_sort | Jun Min Seo |
| collection | DOAJ |
| description | Three new mixed metal fluoride hydrates, <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> (<i>M</i><sup>2+</sup> = Fe<sup>2+</sup>, Co<sup>2+</sup>, or Ni<sup>2+</sup>), were synthesized and characterized. The crystals of <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> were obtained using a hydrothermal method with a CF<sub>3</sub>COOH aqueous solution. The crystal structures displayed polymorphisms in <i>C</i>2/<i>m</i> (No. 12) or <i>P</i>-1 (No. 2) space groups, depending on temperature variations. The observed polymorphisms in <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> are associated with changes in the bonding environment of [<i>M</i>(H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup> and [AlF<sub>5</sub>(H<sub>2</sub>O)]<sup>2−</sup> 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 <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> revealed distinctive absorption bands dependent on the [<i>M</i>(H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup> complex. This work provides a detailed account of the synthetic procedure, crystal structures, and spectroscopic characterization of <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub>. |
| first_indexed | 2024-03-07T22:36:44Z |
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| id | doaj.art-a6e39f0cc7f34ed68861cffc398a1761 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-07T22:36:44Z |
| publishDate | 2024-02-01 |
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| series | Crystals |
| spelling | doaj.art-a6e39f0cc7f34ed68861cffc398a17612024-02-23T15:13:20ZengMDPI AGCrystals2073-43522024-02-0114219710.3390/cryst14020197Polymorphisms in <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> (<i>M</i><sup>2<i>+</i></sup> = Fe<sup>2+</sup>, Co<sup>2+</sup>, or Ni<sup>2+</sup>): Syntheses, Crystal Structures, and Characterization of New Mixed Metal Fluoride HydratesJun Min Seo0Hongil Jo1Myung Ho Choi2Kang Min Ok3Hong Young Chang4Sun Woo Kim5Department of Chemistry Education, Chosun University, Gwangju 61452, Republic of KoreaDepartment of Chemistry, Sogang University, Seoul 04107, Republic of KoreaDepartment of Chemistry, Sogang University, Seoul 04107, Republic of KoreaDepartment of Chemistry, Sogang University, Seoul 04107, Republic of KoreaDepartment of Computer, Mathematical and Physical Sciences (CMPS), Sul Ross State University, Alpine, TX 79832, USADepartment of Chemistry Education, Chosun University, Gwangju 61452, Republic of KoreaThree new mixed metal fluoride hydrates, <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> (<i>M</i><sup>2+</sup> = Fe<sup>2+</sup>, Co<sup>2+</sup>, or Ni<sup>2+</sup>), were synthesized and characterized. The crystals of <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> were obtained using a hydrothermal method with a CF<sub>3</sub>COOH aqueous solution. The crystal structures displayed polymorphisms in <i>C</i>2/<i>m</i> (No. 12) or <i>P</i>-1 (No. 2) space groups, depending on temperature variations. The observed polymorphisms in <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> are associated with changes in the bonding environment of [<i>M</i>(H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup> and [AlF<sub>5</sub>(H<sub>2</sub>O)]<sup>2−</sup> 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 <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> revealed distinctive absorption bands dependent on the [<i>M</i>(H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup> complex. This work provides a detailed account of the synthetic procedure, crystal structures, and spectroscopic characterization of <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub>.https://www.mdpi.com/2073-4352/14/2/197polymorphismsfluorideshydrothermalhydrogen bondingmixed metal |
| spellingShingle | Jun Min Seo Hongil Jo Myung Ho Choi Kang Min Ok Hong Young Chang Sun Woo Kim Polymorphisms in <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> (<i>M</i><sup>2<i>+</i></sup> = Fe<sup>2+</sup>, Co<sup>2+</sup>, or Ni<sup>2+</sup>): Syntheses, Crystal Structures, and Characterization of New Mixed Metal Fluoride Hydrates Crystals polymorphisms fluorides hydrothermal hydrogen bonding mixed metal |
| title | Polymorphisms in <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> (<i>M</i><sup>2<i>+</i></sup> = Fe<sup>2+</sup>, Co<sup>2+</sup>, or Ni<sup>2+</sup>): Syntheses, Crystal Structures, and Characterization of New Mixed Metal Fluoride Hydrates |
| title_full | Polymorphisms in <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> (<i>M</i><sup>2<i>+</i></sup> = Fe<sup>2+</sup>, Co<sup>2+</sup>, or Ni<sup>2+</sup>): Syntheses, Crystal Structures, and Characterization of New Mixed Metal Fluoride Hydrates |
| title_fullStr | Polymorphisms in <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> (<i>M</i><sup>2<i>+</i></sup> = Fe<sup>2+</sup>, Co<sup>2+</sup>, or Ni<sup>2+</sup>): Syntheses, Crystal Structures, and Characterization of New Mixed Metal Fluoride Hydrates |
| title_full_unstemmed | Polymorphisms in <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> (<i>M</i><sup>2<i>+</i></sup> = Fe<sup>2+</sup>, Co<sup>2+</sup>, or Ni<sup>2+</sup>): Syntheses, Crystal Structures, and Characterization of New Mixed Metal Fluoride Hydrates |
| title_short | Polymorphisms in <i>M</i><sup>2+</sup>AlF<sub>5</sub>(H<sub>2</sub>O)<sub>7</sub> (<i>M</i><sup>2<i>+</i></sup> = Fe<sup>2+</sup>, Co<sup>2+</sup>, or Ni<sup>2+</sup>): Syntheses, Crystal Structures, and Characterization of New Mixed Metal Fluoride Hydrates |
| title_sort | polymorphisms in i m i sup 2 sup alf sub 5 sub h sub 2 sub o sub 7 sub i m i sup 2 i i sup fe sup 2 sup co sup 2 sup or ni sup 2 sup syntheses crystal structures and characterization of new mixed metal fluoride hydrates |
| topic | polymorphisms fluorides hydrothermal hydrogen bonding mixed metal |
| url | https://www.mdpi.com/2073-4352/14/2/197 |
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