Solvent-Induced Cobalt(II) Cyanoguanidine Bromides: Syntheses, Crystal Structure, Optical and Magnetic Properties
Two different phase-pure cobalt(II) cyanoguanidine bromide coordination compounds, Co(C<sub>2</sub>N<sub>4</sub>H<sub>4</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>·2Br·2H<sub>2</sub>O (<b>1</b>) and Co...
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MDPI AG
2022-09-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/12/10/1377 |
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| author | Jing Zhang Alex. J. Corkett Jan van Leusen Ulli Englert Richard Dronskowski |
| author_facet | Jing Zhang Alex. J. Corkett Jan van Leusen Ulli Englert Richard Dronskowski |
| author_sort | Jing Zhang |
| collection | DOAJ |
| description | Two different phase-pure cobalt(II) cyanoguanidine bromide coordination compounds, Co(C<sub>2</sub>N<sub>4</sub>H<sub>4</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>·2Br·2H<sub>2</sub>O (<b>1</b>) and Co<sub>3</sub>(C<sub>2</sub>N<sub>4</sub>H<sub>4</sub>)<sub>8</sub>(H<sub>2</sub>O)<sub>8</sub>·6Br (<b>2</b>), were precipitated from aqueous and methanol solutions, respectively, and their structures were solved and refined from X-ray single-crystal data at 100 K. Both <b>1</b> and <b>2</b> crystallize in the triclinic system with space group <i>P</i><inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover><mn>1</mn><mo>¯</mo></mover></mrow></semantics></math></inline-formula>. The structure of <b>1</b> consists of two crystallographically distinct isolated CoO<sub>4</sub>N<sub>2</sub> octahedral units plus bromide anions and crystal water molecules, whereas <b>2</b> is built from both isolated octahedra and discrete binuclear cluster units made from edge-sharing octahedra. Diffuse reflectance spectra and IR analysis then go on to highlight optical and vibrational differences between these two compounds. The magnetic susceptibility of <b>1</b> is consistent with either isolated or very weakly interacting Co<sup>2+</sup> centers whereas the magnetic susceptibility of <b>2</b> evidences the potential weak antiferromagnetic exchange interactions that may arise from superexchange within the binuclear clusters. |
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| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-09T20:25:11Z |
| publishDate | 2022-09-01 |
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| record_format | Article |
| series | Crystals |
| spelling | doaj.art-49720e5be84e4b24a452d6f893a3bd692023-11-23T23:37:27ZengMDPI AGCrystals2073-43522022-09-011210137710.3390/cryst12101377Solvent-Induced Cobalt(II) Cyanoguanidine Bromides: Syntheses, Crystal Structure, Optical and Magnetic PropertiesJing Zhang0Alex. J. Corkett1Jan van Leusen2Ulli Englert3Richard Dronskowski4Institute of Inorganic Chemistry, RWTH Aachen University, 52056 Aachen, GermanyInstitute of Inorganic Chemistry, RWTH Aachen University, 52056 Aachen, GermanyInstitute of Inorganic Chemistry, RWTH Aachen University, 52056 Aachen, GermanyInstitute of Inorganic Chemistry, RWTH Aachen University, 52056 Aachen, GermanyInstitute of Inorganic Chemistry, RWTH Aachen University, 52056 Aachen, GermanyTwo different phase-pure cobalt(II) cyanoguanidine bromide coordination compounds, Co(C<sub>2</sub>N<sub>4</sub>H<sub>4</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>·2Br·2H<sub>2</sub>O (<b>1</b>) and Co<sub>3</sub>(C<sub>2</sub>N<sub>4</sub>H<sub>4</sub>)<sub>8</sub>(H<sub>2</sub>O)<sub>8</sub>·6Br (<b>2</b>), were precipitated from aqueous and methanol solutions, respectively, and their structures were solved and refined from X-ray single-crystal data at 100 K. Both <b>1</b> and <b>2</b> crystallize in the triclinic system with space group <i>P</i><inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover><mn>1</mn><mo>¯</mo></mover></mrow></semantics></math></inline-formula>. The structure of <b>1</b> consists of two crystallographically distinct isolated CoO<sub>4</sub>N<sub>2</sub> octahedral units plus bromide anions and crystal water molecules, whereas <b>2</b> is built from both isolated octahedra and discrete binuclear cluster units made from edge-sharing octahedra. Diffuse reflectance spectra and IR analysis then go on to highlight optical and vibrational differences between these two compounds. The magnetic susceptibility of <b>1</b> is consistent with either isolated or very weakly interacting Co<sup>2+</sup> centers whereas the magnetic susceptibility of <b>2</b> evidences the potential weak antiferromagnetic exchange interactions that may arise from superexchange within the binuclear clusters.https://www.mdpi.com/2073-4352/12/10/1377solvent inductioncrystal structureoptical propertiesmagnetic properties |
| spellingShingle | Jing Zhang Alex. J. Corkett Jan van Leusen Ulli Englert Richard Dronskowski Solvent-Induced Cobalt(II) Cyanoguanidine Bromides: Syntheses, Crystal Structure, Optical and Magnetic Properties Crystals solvent induction crystal structure optical properties magnetic properties |
| title | Solvent-Induced Cobalt(II) Cyanoguanidine Bromides: Syntheses, Crystal Structure, Optical and Magnetic Properties |
| title_full | Solvent-Induced Cobalt(II) Cyanoguanidine Bromides: Syntheses, Crystal Structure, Optical and Magnetic Properties |
| title_fullStr | Solvent-Induced Cobalt(II) Cyanoguanidine Bromides: Syntheses, Crystal Structure, Optical and Magnetic Properties |
| title_full_unstemmed | Solvent-Induced Cobalt(II) Cyanoguanidine Bromides: Syntheses, Crystal Structure, Optical and Magnetic Properties |
| title_short | Solvent-Induced Cobalt(II) Cyanoguanidine Bromides: Syntheses, Crystal Structure, Optical and Magnetic Properties |
| title_sort | solvent induced cobalt ii cyanoguanidine bromides syntheses crystal structure optical and magnetic properties |
| topic | solvent induction crystal structure optical properties magnetic properties |
| url | https://www.mdpi.com/2073-4352/12/10/1377 |
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