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Bhunia M, Mohar JS, Sandoval-Pauker C, Fehn D, Yang ES, Gau M, Goicoechea J, Ozarowski A, Krzystek J, Telser J, Meyer K, Mindiola DJ. Softer Is Better for Titanium: Molecular Titanium Arsenido Anions Featuring Ti≡As Bonding and a Terminal Parent Arsinidene. J Am Chem Soc 2024; 146:3609-3614. [PMID: 38290427 DOI: 10.1021/jacs.3c12939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
We introduce the arsenido ligand onto the TiIV ion, yielding a remarkably covalent Ti≡As bond and the parent arsinidene Ti═AsH moiety. An anionic arsenido ligand is assembled via reductive decarbonylation involving the discrete TiII salt [K(cryptand)][(PN)2TiCl] (1) (cryptand = 222-Kryptofix) and Na(OCAs)(dioxane)1.5 in thf/toluene to produce the mixed alkali ate-complex [(PN)2Ti(As)]2(μ2-KNa(thf)2) (2) and the discrete salt [K(cryptand)][(PN)2Ti≡As] (3) featuring a terminal Ti≡As ligand. Protonation of 2 or 3 with various weak acids cleanly forms the parent arsinidene [(PN)2Ti═AsH] (4), which upon deprotonation with KCH2Ph in thf generates the more symmetric anionic arsenido [(PN)2Ti(As){μ2-K(thf)2}]2 (5). Experimental and computational studies suggest the pKa of 4 to be ∼23, and the bond orders in 2, 3, and 5 are all in the range of a Ti≡As triple bond, with decreasing bond order in 4.
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Affiliation(s)
- Mrinal Bhunia
- Department of Chemistry, University of Pennsylvania, 231 S 34th St, Philadelphia, Pennsylvania 19104, United States
| | - Jacob S Mohar
- Department of Chemistry, University of Pennsylvania, 231 S 34th St, Philadelphia, Pennsylvania 19104, United States
| | - Christian Sandoval-Pauker
- Department of Chemistry and Biochemistry, University of Texas at El Paso, El Paso, Texas 79968, United States
| | - Dominik Fehn
- Departments of Chemistry & Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen - Nürnberg (FAU), 91058 Erlangen, Germany
| | - Eric S Yang
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Michael Gau
- Department of Chemistry, University of Pennsylvania, 231 S 34th St, Philadelphia, Pennsylvania 19104, United States
| | - Jose Goicoechea
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Joshua Telser
- Department of Biological, Physical and Health Sciences, Roosevelt University, Chicago, Illinois 60605, United States
| | - Karsten Meyer
- Departments of Chemistry & Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen - Nürnberg (FAU), 91058 Erlangen, Germany
| | - Daniel J Mindiola
- Department of Chemistry, University of Pennsylvania, 231 S 34th St, Philadelphia, Pennsylvania 19104, United States
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2
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Sheikh T, Mir WJ, Nematulloev S, Maity P, Yorov KE, Hedhili MN, Emwas AH, Khan MS, Abulikemu M, Mohammed OF, Bakr OM. InAs Nanorod Colloidal Quantum Dots with Tunable Bandgaps Deep into the Short-Wave Infrared. ACS NANO 2023; 17:23094-23102. [PMID: 37955579 DOI: 10.1021/acsnano.3c08796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2023]
Abstract
InAs colloidal quantum dots (CQDs) have emerged as candidate lead- and mercury-free solution-processed semiconductors for infrared technology due to their appropriate bulk bandgap, which can be tuned by quantum confinement, and promising charge-carrier transport properties. However, the lack of suitable arsenic precursors and readily accessible synthesis conditions have limited InAs CQDs to smaller sizes (<7 nm), with bandgaps largely restricted to <1400 nm in the near-infrared spectral window. Conventional InAs CQD synthesis requires highly reactive, hazardous arsenic precursors, which are commercially scarce, making the synthesis hard to control and study. Here, we present a controlled synthesis strategy (using only readily available and less reactive precursors) to overcome the practical wavelength limitation of InAs CQDs, achieving monodisperse InAs nanorod CQDs with bandgaps tunable from ∼1200 to ∼1800 nm, thus crossing deep into the short-wave infrared (SWIR) region. By controlling the reactivity through in situ precursor complexation, we isolate the reaction mechanism, producing InAs nanorod CQDs that display narrow excitonic features and efficient carrier multiplication. Our work enables InAs CQDs for a wider range of SWIR applications.
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Affiliation(s)
- Tariq Sheikh
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Wasim J Mir
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Saidkhodzha Nematulloev
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Partha Maity
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
- Advanced Membranes and Porous Materials Center, Division of Physical Science and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Khursand E Yorov
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Mohamed Nejib Hedhili
- KAUST Core Laboratories, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Abdul-Hamid Emwas
- KAUST Core Laboratories, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Mudeha Shafat Khan
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Mutalifu Abulikemu
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Omar F Mohammed
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
- Advanced Membranes and Porous Materials Center, Division of Physical Science and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Osman M Bakr
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
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3
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Reichl S, Riesinger C, Scheer M. Nucleophilic Attack at Pentaarsaferrocene [Cp*Fe(η 5 -As 5 )]-The Way to Larger Polyarsenide Ligands. Angew Chem Int Ed Engl 2023; 62:e202307696. [PMID: 37403967 DOI: 10.1002/anie.202307696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 07/04/2023] [Accepted: 07/05/2023] [Indexed: 07/06/2023]
Abstract
By the reaction of [Cp*Fe(η5 -As5 )] (I) (Cp*=C5 Me5 ) with main group nucleophiles, unique functionalized products with η4 -coordinated polyarsenide (Asn ) units (n=5, 6, 20) are obtained. With carbon-based nucleophiles such as MeLi or KBn (Bn=CH2 Ph), the anionic organo-substituted polyarsenide complexes, [Li(2.2.2-cryptand)][Cp*Fe(η4 -As5 Me)] (1 a) and [K(2.2.2-cryptand)][Cp*Fe{η4 -As5 (CH2 Ph)}] (1 b), are accessible. The use of KAsPh2 leads to a selective and controlled extension of the As5 unit and the formation of the monoanionic compound [K(2.2.2-cryptand][Cp*Fe(η4 -As6 Ph2 )] (2). When I is reacted with [M]As(SiMe3 )2 (M=Li ⋅ THF; K), the formation of the largest known anionic polyarsenide unit in [M'(2.2.2-cryptand)]2 [(Cp*Fe)4 {μ5 -η4 :η4 :η3 :η3 :η1 :η1 -As20 }] (3) occurred (M'=Li (3 a), K (3 b)).
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Affiliation(s)
- Stephan Reichl
- Institute of Inorganic Chemistry, University of Regensburg, 93040, Regensburg, Germany
| | - Christoph Riesinger
- Institute of Inorganic Chemistry, University of Regensburg, 93040, Regensburg, Germany
| | - Manfred Scheer
- Institute of Inorganic Chemistry, University of Regensburg, 93040, Regensburg, Germany
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4
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Franke D, Harris DK, Xie L, Jensen KF, Bawendi MG. The Unexpected Influence of Precursor Conversion Rate in the Synthesis of III-V Quantum Dots. Angew Chem Int Ed Engl 2015; 54:14299-303. [PMID: 26437711 DOI: 10.1002/anie.201505972] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Revised: 07/31/2015] [Indexed: 11/07/2022]
Abstract
Control of quantum dot (QD) precursor chemistry has been expected to help improve the size control and uniformity of III-V QDs such as indium phosphide and indium arsenide. Indeed, experimental results for other QD systems are consistent with the theoretical prediction that the rate of precursor conversion is an important factor controlling QD size and size distribution. We synthesized and characterized the reactivity of a variety of group-V precursors in order to determine if precursor chemistry could be used to improve the quality of III-V QDs. Despite slowing down precursor conversion rate by multiple orders of magnitude, the less reactive precursors do not yield the expected increase in size and improvement in size distribution. This result disproves the widely accepted explanation for the shortcoming of current III-V QD syntheses and points to the need for a new generalizable theoretical picture for the mechanism of QD formation and growth.
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Affiliation(s)
- Daniel Franke
- Department of Chemistry, Massachusetts Institute Of Technology, 77 Massachusetts Avenue, 02139 Cambridge, MA (USA)
| | - Daniel K Harris
- Department of Chemistry, Massachusetts Institute Of Technology, 77 Massachusetts Avenue, 02139 Cambridge, MA (USA)
| | - Lisi Xie
- Department of Chemical Engineering, Massachusetts Institute Of Technology, 77 Massachusetts Avenue, 02139 Cambridge, MA (USA)
| | - Klavs F Jensen
- Department of Chemical Engineering, Massachusetts Institute Of Technology, 77 Massachusetts Avenue, 02139 Cambridge, MA (USA)
| | - Moungi G Bawendi
- Department of Chemistry, Massachusetts Institute Of Technology, 77 Massachusetts Avenue, 02139 Cambridge, MA (USA).
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5
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Franke D, Harris DK, Xie L, Jensen KF, Bawendi MG. The Unexpected Influence of Precursor Conversion Rate in the Synthesis of III-V Quantum Dots. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505972] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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6
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Westerhausen M, Krofta M, Mayer P, Piotrowski H. The Influence of the Neutral Coligand on the Spectroscopic Properties and Crystal Structures of Lithium Tri(
tert
‐butyl)silylarsanides of the Type[(L)LiAs(H)Si
t
Bu
3
] (L = DME, THF). Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200500349] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Matthias Westerhausen
- Institute of Inorganic and Analytic Chemistry, Friedrich‐Schiller‐Universität Jena, August‐Bebel‐Str. 2, 07743 Jena, Germany, Fax: +49‐3641‐948‐102
| | - Mathias Krofta
- Department of Chemistry and Biochemistry, Ludwig‐Maximilians‐Universität München, Butenandtstr. 9 (Haus D), 81377 München, Germany
| | - Peter Mayer
- Department of Chemistry and Biochemistry, Ludwig‐Maximilians‐Universität München, Butenandtstr. 9 (Haus D), 81377 München, Germany
| | - Holger Piotrowski
- Department of Chemistry and Biochemistry, Ludwig‐Maximilians‐Universität München, Butenandtstr. 9 (Haus D), 81377 München, Germany
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8
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Lube MS, Jouet RJ, Wells RL, Whtte PS, Young VG. Further Investigations into the Synthesis and Characterization of Halo-Boron-Arsenic Compounds: X-Ray Crystal Structures of X3B · As(SiMe3)3(X = Cl, I) and [I2BAs(SiMe3)2]2. MAIN GROUP CHEMISTRY 1997. [DOI: 10.1080/10241229712331341204] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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