|
1
|
Hiley CI, Inglis KK, Zanella M, Zhang J, Manning TD, Dyer MS, Knaflič T, Arčon D, Blanc F, Prassides K, Rosseinsky MJ. Crystal Structure and Stoichiometric Composition of Potassium-Intercalated Tetracene. Inorg Chem 2020; 59:12545-12551. [PMID: 32805995 PMCID: PMC7482393 DOI: 10.1021/acs.inorgchem.0c01635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The products of the solid-state reactions between potassium metal and tetracene (K:Tetracene, 1:1, 1.5:1, and 2:1) are fully structurally characterized. Synchrotron X-ray powder diffraction shows that only K2Tetracene forms under the reaction conditions studied, with unreacted tetracene always present for x < 2. Diffraction and 13C MAS NMR show that K2Tetracene has a crystal structure that is analogous to that of K2Pentacene, but with the cations ordered on two sites because of the influence of the length of the hydrocarbon on possible cation positions. K2Tetracene is a nonmagnetic insulator, thus further questioning the nature of reported superconductivity in this class of materials.
Collapse
Affiliation(s)
- Craig I Hiley
- Department of Chemistry, University of Liverpool, 51 Oxford Street, Liverpool, L7 3NY, United Kingdom
| | - Kenneth K Inglis
- Department of Chemistry, University of Liverpool, 51 Oxford Street, Liverpool, L7 3NY, United Kingdom
| | - Marco Zanella
- Department of Chemistry, University of Liverpool, 51 Oxford Street, Liverpool, L7 3NY, United Kingdom
| | - Jiliang Zhang
- Department of Chemistry, University of Liverpool, 51 Oxford Street, Liverpool, L7 3NY, United Kingdom
| | - Troy D Manning
- Department of Chemistry, University of Liverpool, 51 Oxford Street, Liverpool, L7 3NY, United Kingdom
| | - Matthew S Dyer
- Department of Chemistry, University of Liverpool, 51 Oxford Street, Liverpool, L7 3NY, United Kingdom
| | - Tilen Knaflič
- Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Denis Arčon
- Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.,Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia
| | - Frédéric Blanc
- Department of Chemistry, University of Liverpool, 51 Oxford Street, Liverpool, L7 3NY, United Kingdom.,Stephenson Institute for Renewable Energy, University of Liverpool, Crown Street, Liverpool, L69 7ZF, United Kingdom
| | - Kosmas Prassides
- Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, Osaka 599-8531, Japan.,Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-2-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Matthew J Rosseinsky
- Department of Chemistry, University of Liverpool, 51 Oxford Street, Liverpool, L7 3NY, United Kingdom
| |
Collapse
|
|
2
|
Phan QTN, Oikawa S, Heguri S, Matsuda Y, Tanigaki K. Crossover from localized to itinerant states in hydrocarbon Mott insulators. Dalton Trans 2017; 46:6715-6722. [PMID: 28485437 DOI: 10.1039/c7dt00467b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Crossover from an itinerant state to an isolated electronic state in electron-doped polycyclic aromatic hydrocarbon (PAH) was studied for the two smallest zigzag-type molecules of naphthalene (NN) and anthracene (AN) by focusing on their 1 : 1 stoichiometry, A1(NN) and A1(AN), with alkali metals (A = K and Rb). The competition between on-site Coulombic repulsion energy (U) and bandwidth (W) was argued in terms of their magnetic and electrical properties upon lattice expansion, when A varies from K, with a smaller ionic radius, to Rb, with a larger ionic radius. The temperature-dependence of magnetic susceptibility shows a pronounced hump associated with antiferromagnetic (AFM) interactions for Rb1(NN), being similar to those of K1(NN) and K1(AN) in the earlier report. On the other hand, Rb1(AN) intriguingly exhibits paramagnetic susceptibility, observed in a nearly localized electron system, being apart from an highly correlated Mott insulating state. Crystal structural analyses of the X-ray diffraction profiles show a small difference in lattice parameters of the ab plane among K1(NN), K1(AN), and Rb1(NN), whereas Rb1(AN) exhibits a significantly larger value than those of the others, being indicative of greatly modified interaction energies. The different magnetic properties observed in Rb1(AN) are interpreted from its modified intermolecular distance. The possibility of an emergent metallic state of K1(AN) under high pressure has also been described, referring to electrical transport measured under high pressure.
Collapse
Affiliation(s)
- Quynh T N Phan
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Aoba, Sendai, Miyagi 980-8577, Japan.
| | | | | | | | | |
Collapse
|