Reversible Humidity-Driven Transformation of a Bimetallic {EuCo} Molecular Material: Structural, Sorption, and Photoluminescence Studies
Functional molecule-based solids built of metal complexes can reveal a great impact of external stimuli upon their optical, magnetic, electric, and mechanical properties. We report a novel molecular material, {[Eu<sup>III</sup>(H<sub>2</sub>O)<sub>3</sub>(pyrone)&...
| Main Authors: | , , , |
|---|---|
| פורמט: | Article |
| שפה: | English |
| יצא לאור: |
MDPI AG
2021-02-01
|
| סדרה: | Molecules |
| נושאים: | |
| גישה מקוונת: | https://www.mdpi.com/1420-3049/26/4/1102 |
| _version_ | 1827588812293799936 |
|---|---|
| author | Jakub J. Zakrzewski Michal Heczko Robert Jankowski Szymon Chorazy |
| author_facet | Jakub J. Zakrzewski Michal Heczko Robert Jankowski Szymon Chorazy |
| author_sort | Jakub J. Zakrzewski |
| collection | DOAJ |
| description | Functional molecule-based solids built of metal complexes can reveal a great impact of external stimuli upon their optical, magnetic, electric, and mechanical properties. We report a novel molecular material, {[Eu<sup>III</sup>(H<sub>2</sub>O)<sub>3</sub>(pyrone)<sub>4</sub>][Co<sup>III</sup>(CN)<sub>6</sub>]}·<i>n</i>H<sub>2</sub>O (<b>1</b>, <i>n</i> = 2; <b>2</b>, <i>n</i> = 1), which was obtained by the self-assembly of Eu<sup>3+</sup> and [Co(CN)<sub>6</sub>]<sup>3−</sup> ions in the presence of a small 2-pyrrolidinone (pyrone) ligand in an aqueous medium. The as-synthesized material, <b>1</b>, consists of dinuclear cyanido-bridged {EuCo} molecules accompanied by two H-bonded water molecules. By lowering the relative humidity (RH) below 30% at room temperature, <b>1</b> undergoes a single-crystal-to-single-crystal transformation related to the partial removal of crystallization water molecules which results in the new crystalline phase, <b>2</b>. Both <b>1</b> and <b>2</b> solvates exhibit pronounced Eu<sup>III</sup>-centered visible photoluminescence. However, they differ in the energy splitting of the main emission band of a <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub> origin, and the emission lifetime, which is longer in the partially dehydrated <b>2</b>. As the <b>1</b> ↔ <b>2</b> structural transformation can be repeatedly reversed by changing the RH value, the reported material shows a room-temperature switching of detailed luminescent features including the ratio between emission components and the emission lifetime values. |
| first_indexed | 2024-03-09T00:43:56Z |
| format | Article |
| id | doaj.art-a4d0f2512c3b4e50813149d0afb51a0d |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T00:43:56Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-a4d0f2512c3b4e50813149d0afb51a0d2023-12-11T17:40:51ZengMDPI AGMolecules1420-30492021-02-01264110210.3390/molecules26041102Reversible Humidity-Driven Transformation of a Bimetallic {EuCo} Molecular Material: Structural, Sorption, and Photoluminescence StudiesJakub J. Zakrzewski0Michal Heczko1Robert Jankowski2Szymon Chorazy3Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, PolandFaculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, PolandFaculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, PolandFaculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, PolandFunctional molecule-based solids built of metal complexes can reveal a great impact of external stimuli upon their optical, magnetic, electric, and mechanical properties. We report a novel molecular material, {[Eu<sup>III</sup>(H<sub>2</sub>O)<sub>3</sub>(pyrone)<sub>4</sub>][Co<sup>III</sup>(CN)<sub>6</sub>]}·<i>n</i>H<sub>2</sub>O (<b>1</b>, <i>n</i> = 2; <b>2</b>, <i>n</i> = 1), which was obtained by the self-assembly of Eu<sup>3+</sup> and [Co(CN)<sub>6</sub>]<sup>3−</sup> ions in the presence of a small 2-pyrrolidinone (pyrone) ligand in an aqueous medium. The as-synthesized material, <b>1</b>, consists of dinuclear cyanido-bridged {EuCo} molecules accompanied by two H-bonded water molecules. By lowering the relative humidity (RH) below 30% at room temperature, <b>1</b> undergoes a single-crystal-to-single-crystal transformation related to the partial removal of crystallization water molecules which results in the new crystalline phase, <b>2</b>. Both <b>1</b> and <b>2</b> solvates exhibit pronounced Eu<sup>III</sup>-centered visible photoluminescence. However, they differ in the energy splitting of the main emission band of a <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub> origin, and the emission lifetime, which is longer in the partially dehydrated <b>2</b>. As the <b>1</b> ↔ <b>2</b> structural transformation can be repeatedly reversed by changing the RH value, the reported material shows a room-temperature switching of detailed luminescent features including the ratio between emission components and the emission lifetime values.https://www.mdpi.com/1420-3049/26/4/1102lanthanidestransition metalscyanido ligandluminescencemolecular switches |
| spellingShingle | Jakub J. Zakrzewski Michal Heczko Robert Jankowski Szymon Chorazy Reversible Humidity-Driven Transformation of a Bimetallic {EuCo} Molecular Material: Structural, Sorption, and Photoluminescence Studies Molecules lanthanides transition metals cyanido ligand luminescence molecular switches |
| title | Reversible Humidity-Driven Transformation of a Bimetallic {EuCo} Molecular Material: Structural, Sorption, and Photoluminescence Studies |
| title_full | Reversible Humidity-Driven Transformation of a Bimetallic {EuCo} Molecular Material: Structural, Sorption, and Photoluminescence Studies |
| title_fullStr | Reversible Humidity-Driven Transformation of a Bimetallic {EuCo} Molecular Material: Structural, Sorption, and Photoluminescence Studies |
| title_full_unstemmed | Reversible Humidity-Driven Transformation of a Bimetallic {EuCo} Molecular Material: Structural, Sorption, and Photoluminescence Studies |
| title_short | Reversible Humidity-Driven Transformation of a Bimetallic {EuCo} Molecular Material: Structural, Sorption, and Photoluminescence Studies |
| title_sort | reversible humidity driven transformation of a bimetallic euco molecular material structural sorption and photoluminescence studies |
| topic | lanthanides transition metals cyanido ligand luminescence molecular switches |
| url | https://www.mdpi.com/1420-3049/26/4/1102 |
| work_keys_str_mv | AT jakubjzakrzewski reversiblehumiditydriventransformationofabimetalliceucomolecularmaterialstructuralsorptionandphotoluminescencestudies AT michalheczko reversiblehumiditydriventransformationofabimetalliceucomolecularmaterialstructuralsorptionandphotoluminescencestudies AT robertjankowski reversiblehumiditydriventransformationofabimetalliceucomolecularmaterialstructuralsorptionandphotoluminescencestudies AT szymonchorazy reversiblehumiditydriventransformationofabimetalliceucomolecularmaterialstructuralsorptionandphotoluminescencestudies |