Synthesis, morphology, structure, and magnetic characterization of layered cobalt hydroxyisocyanates.
New layered pink cobalt hydroxyisocyanates have been prepared by controlled hydrolysis of aqueous solutions of CoCl2.6H2O. Co(OH)(1.4)(NCO) 0.6.0.6H 2O ( 1) is formed when urea is used as the hydrolysis agent and mannitol as the stabilizer, while Co(OH)(1.25)(NCO)(0.75).0.2H2O ( 2) is formed when th...
| Asıl Yazarlar: | , |
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| Materyal Türü: | Journal article |
| Dil: | English |
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2008
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| _version_ | 1826301418332487680 |
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| author | Du, Y O'Hare, D |
| author_facet | Du, Y O'Hare, D |
| author_sort | Du, Y |
| collection | OXFORD |
| description | New layered pink cobalt hydroxyisocyanates have been prepared by controlled hydrolysis of aqueous solutions of CoCl2.6H2O. Co(OH)(1.4)(NCO) 0.6.0.6H 2O ( 1) is formed when urea is used as the hydrolysis agent and mannitol as the stabilizer, while Co(OH)(1.25)(NCO)(0.75).0.2H2O ( 2) is formed when the hydrolysis agent is changed to hexamethylenetetramine and NaOCN is added to the solution. IR spectroscopy of 1 and 2 indicates that the OCN (-) is N-bonded to Co (2+). The X-ray powder data for 1 could be indexed using an intergrowth model consisting of both rhombohedral ( R3 m (166); a = 3.2031(1) A, c = 23.6876(11) A, hydrotalcite-like, 3 R 1) and hexagonal ( P 63/ mmc (194); a = 3.2005(2) A, c = 15.8303(5) A, Manasseite-like, 2H1) polytypes. Rietveld refinement of the X-ray powder data was performed using a two polytype model and 30% random substitution of the OH (-) ions by OCN (-). Although it is less crystalline, the XRD data for 2 can be indexed using a rhombohedral-symmetry cell with unit cell parameters, a = 3.158 A and c = 21.57 A. Both 1 and 2 exhibit magnetically ordered ground states with a saturation magnetization of ca. 2.0 mu B. The magnetization data is consistent with 3D ferromagnetic ordering of edge-share octahedral-Co (2+) layers with effective spin S' = 1/2. |
| first_indexed | 2024-03-07T05:32:08Z |
| format | Journal article |
| id | oxford-uuid:e29f65b0-dec4-41e1-88d9-0a4524a9a525 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:32:08Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | oxford-uuid:e29f65b0-dec4-41e1-88d9-0a4524a9a5252022-03-27T10:02:47ZSynthesis, morphology, structure, and magnetic characterization of layered cobalt hydroxyisocyanates.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e29f65b0-dec4-41e1-88d9-0a4524a9a525EnglishSymplectic Elements at Oxford2008Du, YO'Hare, DNew layered pink cobalt hydroxyisocyanates have been prepared by controlled hydrolysis of aqueous solutions of CoCl2.6H2O. Co(OH)(1.4)(NCO) 0.6.0.6H 2O ( 1) is formed when urea is used as the hydrolysis agent and mannitol as the stabilizer, while Co(OH)(1.25)(NCO)(0.75).0.2H2O ( 2) is formed when the hydrolysis agent is changed to hexamethylenetetramine and NaOCN is added to the solution. IR spectroscopy of 1 and 2 indicates that the OCN (-) is N-bonded to Co (2+). The X-ray powder data for 1 could be indexed using an intergrowth model consisting of both rhombohedral ( R3 m (166); a = 3.2031(1) A, c = 23.6876(11) A, hydrotalcite-like, 3 R 1) and hexagonal ( P 63/ mmc (194); a = 3.2005(2) A, c = 15.8303(5) A, Manasseite-like, 2H1) polytypes. Rietveld refinement of the X-ray powder data was performed using a two polytype model and 30% random substitution of the OH (-) ions by OCN (-). Although it is less crystalline, the XRD data for 2 can be indexed using a rhombohedral-symmetry cell with unit cell parameters, a = 3.158 A and c = 21.57 A. Both 1 and 2 exhibit magnetically ordered ground states with a saturation magnetization of ca. 2.0 mu B. The magnetization data is consistent with 3D ferromagnetic ordering of edge-share octahedral-Co (2+) layers with effective spin S' = 1/2. |
| spellingShingle | Du, Y O'Hare, D Synthesis, morphology, structure, and magnetic characterization of layered cobalt hydroxyisocyanates. |
| title | Synthesis, morphology, structure, and magnetic characterization of layered cobalt hydroxyisocyanates. |
| title_full | Synthesis, morphology, structure, and magnetic characterization of layered cobalt hydroxyisocyanates. |
| title_fullStr | Synthesis, morphology, structure, and magnetic characterization of layered cobalt hydroxyisocyanates. |
| title_full_unstemmed | Synthesis, morphology, structure, and magnetic characterization of layered cobalt hydroxyisocyanates. |
| title_short | Synthesis, morphology, structure, and magnetic characterization of layered cobalt hydroxyisocyanates. |
| title_sort | synthesis morphology structure and magnetic characterization of layered cobalt hydroxyisocyanates |
| work_keys_str_mv | AT duy synthesismorphologystructureandmagneticcharacterizationoflayeredcobalthydroxyisocyanates AT ohared synthesismorphologystructureandmagneticcharacterizationoflayeredcobalthydroxyisocyanates |