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Getmanenko YA, Mullins CS, Nesterov VN, Lake S, Risko C, Johnston-Halperin E. Magnetic ordering in a vanadium-organic coordination polymer using a pyrrolo[2,3- d:5,4- d']bis(thiazole)-based ligand. RSC Adv 2018; 8:36223-36232. [PMID: 35558484 PMCID: PMC9088712 DOI: 10.1039/c8ra05697h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 10/11/2018] [Indexed: 11/29/2022] Open
Abstract
Here we present the synthesis and characterization of a hybrid vanadium-organic coordination polymer with robust magnetic order, a Curie temperature T C of ∼110 K, a coercive field of ∼5 Oe at 5 K, and a maximum mass magnetization of about half that of the benchmark ferrimagnetic vanadium(tetracyanoethylene)∼2 (V·(TCNE)∼2). This material was prepared using a new tetracyano-substituted quinoidal organic small molecule 7 based on a tricyclic heterocycle 4-hexyl-4H-pyrrolo[2,3-d:5,4-d']bis(thiazole) (C6-PBTz). Single crystal X-ray diffraction of the 2,6-diiodo derivative of the parent C6-PBTz, showed a disordered hexyl chain and a nearly linear arrangement of the substituents in positions 2 and 6 of the tricyclic core. Density functional theory (DFT) calculations indicate that C6-PBTz-based ligand 7 is a strong acceptor with an electron affinity larger than that of TCNE and several other ligands previously used in molecular magnets. This effect is due in part to the electron-deficient thiazole rings and extended delocalization of the frontier molecular orbitals. The ligand detailed in this study, a representative example of fused heterocycle aromatic cores with extended π conjugation, introduces new opportunities for structure-magnetic-property correlation studies where the chemistry of the tricyclic heterocycles can modulate the electronic properties and the substituent at the central N-position can vary the spatial characteristics of the magnetic polymer.
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Affiliation(s)
- Yulia A Getmanenko
- Department of Physics, The Ohio State University Columbus Ohio 43210-1173 USA
| | - Christopher S Mullins
- Department of Chemistry and Center for Applied Energy Research, University of Kentucky Lexington Kentucky 40506-0055 USA
| | | | - Stephanie Lake
- Department of Physics, The Ohio State University Columbus Ohio 43210-1173 USA
| | - Chad Risko
- Department of Chemistry and Center for Applied Energy Research, University of Kentucky Lexington Kentucky 40506-0055 USA
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Hao J, Davidson RA, Kavand M, Schooten KJV, Boehme C, Miller JS. Hexacyanobutadienide-Based Frustrated and Weak Ferrimagnets: M(HCBD)2·zCH2Cl2 (M = V, Fe). Inorg Chem 2016; 55:9393-9. [PMID: 27579579 DOI: 10.1021/acs.inorgchem.6b01565] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hexacyanobutadiene (HCBD) and M(CO)x (M = V, x = 6; Fe, x = 5) react in CH2Cl2 to form new organic-based magnets of M[HCBD]2·z(CH2Cl2) composition. Analysis of the IR spectrum [M = V: ν(CN) 2193 and 2116 cm(-1) (fwhh ∼400 cm(-1)); Fe: 2196 and 2145 (fwhh ∼150 cm(-1))] suggests that HCBD is reduced to the radical anion, [HCBD](•-), and the broadness suggests multiple and variable nitriles sites are coordinated to the V(II), leading to a complex mixture of magnetic couplings and behaviors that deviate from paramagnetic behavior below ∼150 K, and a frustrated magnet with Tc ≈ 9 K is observed for V[HCBD]2, the first cyanocarbon-based frustrated magnet. Fe[HCBD]2 behaves as a weak ferromagnet (canted antiferromagnet) with some spin glass behavior with a 10 K Tc.
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Affiliation(s)
- Jingjun Hao
- Material Research Science and Engineering Center, University of Utah , Salt Lake City, Utah 84112, United States.,Department of Chemistry, University of Utah , 315 S. 1400 E. RM 2124, Salt Lake City, Utah 84112-0850, United States
| | - Royce A Davidson
- Department of Chemistry, University of Utah , 315 S. 1400 E. RM 2124, Salt Lake City, Utah 84112-0850, United States
| | - Marzieh Kavand
- Department of Physics and Astronomy, University of Utah , Salt Lake City, Utah 84112-0830, United States
| | - Kipp J van Schooten
- Department of Physics and Astronomy, University of Utah , Salt Lake City, Utah 84112-0830, United States
| | - Christoph Boehme
- Material Research Science and Engineering Center, University of Utah , Salt Lake City, Utah 84112, United States.,Department of Physics and Astronomy, University of Utah , Salt Lake City, Utah 84112-0830, United States
| | - Joel S Miller
- Material Research Science and Engineering Center, University of Utah , Salt Lake City, Utah 84112, United States.,Department of Chemistry, University of Utah , 315 S. 1400 E. RM 2124, Salt Lake City, Utah 84112-0850, United States
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