1
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Schwotzer F, Senkovska I, Bon V, Lochmann S, Evans JD, Pohl D, Rellinghaus B, Kaskel S. Solvent-assisted delamination of layered copper dithienothiophene-dicarboxylate (DUT-134). Inorg Chem Front 2021. [DOI: 10.1039/d1qi00349f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Rational selection of the delamination solvent enables efficient exfoliation of layered MOF, resulting in suspension of the nanosheets stable over days.
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Affiliation(s)
- Friedrich Schwotzer
- Inorganic Chemistry I
- Faculty of Chemistry and Food Chemistry
- Technische Universität Dresden
- 01069 Dresden
- Germany
| | - Irena Senkovska
- Inorganic Chemistry I
- Faculty of Chemistry and Food Chemistry
- Technische Universität Dresden
- 01069 Dresden
- Germany
| | - Volodymyr Bon
- Inorganic Chemistry I
- Faculty of Chemistry and Food Chemistry
- Technische Universität Dresden
- 01069 Dresden
- Germany
| | - Stefanie Lochmann
- Inorganic Chemistry I
- Faculty of Chemistry and Food Chemistry
- Technische Universität Dresden
- 01069 Dresden
- Germany
| | - Jack D. Evans
- Inorganic Chemistry I
- Faculty of Chemistry and Food Chemistry
- Technische Universität Dresden
- 01069 Dresden
- Germany
| | - Darius Pohl
- Dresden Center for Nanoanalysis (DCN)
- Center for advancing electronics Dresden
- Technische Universität Dresden
- 01069 Dresden
- Germany
| | - Bernd Rellinghaus
- Dresden Center for Nanoanalysis (DCN)
- Center for advancing electronics Dresden
- Technische Universität Dresden
- 01069 Dresden
- Germany
| | - Stefan Kaskel
- Inorganic Chemistry I
- Faculty of Chemistry and Food Chemistry
- Technische Universität Dresden
- 01069 Dresden
- Germany
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2
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Zaitsev KV, Lam K, Tafeenko VA, Korlyukov AA, Poleshchuk OK. Aryl Oligogermanes as Ligands for Transition Metal Complexes. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201801095] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Kirill V. Zaitsev
- Chemistry Department Moscow State University B‐234 Leninskie Gory, 1, 3 119991 Moscow Russia
| | - Kevin Lam
- Department of Pharmaceutical Chemical and Environmental Sciences University of Greenwich Chatham Maritime ME4 4TB Kent UK
| | - Viktor A. Tafeenko
- Chemistry Department Moscow State University B‐234 Leninskie Gory, 1, 3 119991 Moscow Russia
| | - Alexander A. Korlyukov
- Russian Academy of Sciences Chemical and Environmental Sciences A.N.Nesmeyanov Institute of Organoelement Compounds Vavilova Str. Moscow Russia
| | - Oleg Kh. Poleshchuk
- Chemical and Environmental Sciences National Research Tomsk Polytechnic University Lenin Av., 30 634050 Tomsk Russia
- Chemical and Environmental Sciences Tomsk State Pedagogical University Kievskaya Str., 60 634061 Tomsk Russia
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3
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Cheng T, Xiao X, Zhang L, Liu CY, Wang LL, Meng M, Zhao F, Wang H, Ji LN. Photoinduced δ electron transfer in phenylene bridged Mo 2 dimers. Phys Chem Chem Phys 2017; 19:1740-1745. [PMID: 28044168 DOI: 10.1039/c6cp07582g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoinduced electron transfer (ET) in Mo2 dimers, [Mo2(DAniF)3]2(μ-E2C(ph)CE2) (DAniF = N,N'-di(p-anisyl)formamidinate, E = O or S), has been studied by femtosecond transient spectral techniques. Using a 355 nm laser pulse, the δ electrons on the Mo-Mo quadruple bonds are selectively excited and subsequent charge separation yields diradicals [Mo2]˙--ph-[Mo2]˙+ and [Mo2]-ph˙--[Mo2]˙+. The charge separation (CS) and recombination (CR) rates are derived by fitting the decay kinetic data of the excited states. Surprisingly, it is found that the CR rate constants (kCR-1, ∼1012 s-1) for [Mo2]˙--ph-[Mo2]˙+ are larger than the data (kCR-2) for [Mo2]-ph˙--[Mo2]˙+ by about one order of magnitude, although in the first case, the ET distance is doubled and the electronic coupling between the donor and acceptor is weaker. Optical analyses reveal that the free energy changes (ΔG°) for the two CR processes correspond to the δ → δ* and the metal (δ) to bridging ligand (π*) transition energies, respectively, and thus, the ET kinetics is dominated likely by the driving force (-ΔG°).
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Affiliation(s)
- Tao Cheng
- Department of Chemistry, Jinan University, 601 Huang-Pu Avenue West, Guangzhou 510632, China.
| | - Xuan Xiao
- Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Lei Zhang
- State Key Laboratory of Optoelectronics Material and Technologies, Sun Yet-Sen University, Xingang West, Guangzhou 510275, China.
| | - Chun Y Liu
- Department of Chemistry, Jinan University, 601 Huang-Pu Avenue West, Guangzhou 510632, China. and Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai 200092, China and State Key Laboratory of Optoelectronics Material and Technologies, Sun Yet-Sen University, Xingang West, Guangzhou 510275, China.
| | - Li-Li Wang
- State Key Laboratory of Optoelectronics Material and Technologies, Sun Yet-Sen University, Xingang West, Guangzhou 510275, China.
| | - Miao Meng
- Department of Chemistry, Jinan University, 601 Huang-Pu Avenue West, Guangzhou 510632, China.
| | - Fang Zhao
- State Key Laboratory of Optoelectronics Material and Technologies, Sun Yet-Sen University, Xingang West, Guangzhou 510275, China.
| | - Hui Wang
- State Key Laboratory of Optoelectronics Material and Technologies, Sun Yet-Sen University, Xingang West, Guangzhou 510275, China.
| | - Liang-Nian Ji
- State Key Laboratory of Optoelectronics Material and Technologies, Sun Yet-Sen University, Xingang West, Guangzhou 510275, China.
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4
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Einkauf JD, Ortega RE, Mathivathanan L, de Lill DT. Nitroaromatic sensing with a new lanthanide coordination polymer [Er2(C10H4O4S2)3(H2O)6]n assembled by 2,2′-bithiophene-5,5′-dicarboxylate. NEW J CHEM 2017. [DOI: 10.1039/c7nj01677h] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new three dimensional lanthanide-containing coordination polymer assembled from 2,2′-bithiophene-5,5′-dicarboxylic acid ([Ln2(C10H4O4S2)3(H2O)6]n, Ln = Sm–Yb) was solvothermally synthesized and used as a sensor to detect nitroaromatic compounds via luminescence quenching.
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Affiliation(s)
- Jeffrey D. Einkauf
- Department of Chemistry & Biochemistry
- Florida Atlantic University
- Boca Raton
- USA
| | - Raul E. Ortega
- Department of Chemistry & Biochemistry
- Florida Atlantic University
- Boca Raton
- USA
| | | | - Daniel T. de Lill
- Department of Chemistry & Biochemistry
- Florida Atlantic University
- Boca Raton
- USA
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5
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Kang MT, Meng M, Tan YN, Cheng T, Liu CY. Tuning the Electronic Coupling and Electron Transfer in Mo2 Donor-Acceptor Systems by Variation of the Bridge Conformation. Chemistry 2016; 22:3115-26. [PMID: 26807909 DOI: 10.1002/chem.201504033] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Indexed: 11/12/2022]
Abstract
Assembling two quadruply bonded dimolybdenum units [Mo2 (DAniF)3 ](+) (DAniF=N,N'-di(p-anisyl)formamidinate) with 1,4-naphthalenedicarboxylate and its thiolated derivatives produced three complexes [{Mo2 (DAniF)3 }2 (μ-1,4-O2 CC10 H6 CO2 )], [{Mo2 (DAniF)3 }2 (μ-1,4-OSCC10 H6 COS)], and [{Mo2 (DAniF)3 }2 (μ-1,4-S2 CC10 H6 CS2 )]. In the X-ray structures, the naphthalene bridge deviates from the plane defined by the two Mo-Mo bond vectors with the torsion angle increasing as the chelating atoms of the bridging ligand vary from O to S. The mixed-valent species exhibit intervalence transition absorption bands with high energy and very low intensity. In comparison with the data for the phenylene analogues, the optically determined electronic coupling matrix elements (Hab =258-345 cm(-1) ) are lowered by a factor of two or more, and the electron-transfer rate constants (ket ≈10(11) s(-1) ) are reduced by about one order of magnitude. These results show that, when the electron-transporting ability of the bridge and electron-donating (electron-accepting) ability of the donor (acceptor) are both variable, the former plays a dominant role in controlling the intramolecular electron transfer. DFT calculations revealed that increasing the torsion angle enlarges the HOMO-LUMO energy gap by elevating the (bridging) ligand-based LUMO energy. Therefore, our experimental results and theoretical analyses verify the superexchange mechanism for electronic coupling and electron transfer.
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Affiliation(s)
- Mei Ting Kang
- Department of Chemistry, Jinan University, 601 Huang-Pu Avenue West, Guangzhou, P.R. China
| | - Miao Meng
- Department of Chemistry, Jinan University, 601 Huang-Pu Avenue West, Guangzhou, P.R. China
| | - Ying Ning Tan
- Department of Chemistry, Jinan University, 601 Huang-Pu Avenue West, Guangzhou, P.R. China
| | - Tao Cheng
- Department of Chemistry, Jinan University, 601 Huang-Pu Avenue West, Guangzhou, P.R. China
| | - Chun Y Liu
- Department of Chemistry, Jinan University, 601 Huang-Pu Avenue West, Guangzhou, P.R. China.
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6
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Zhang HL, Zhu GY, Wang G, Meng M, Liu CY, Lei H. Electronic Coupling in [Mo2]-Bridge-[Mo2] Systems with Twisted Bridges. Inorg Chem 2015; 54:11314-22. [PMID: 26579936 DOI: 10.1021/acs.inorgchem.5b01923] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In order to evaluate the impact of bridge conformation on electronic coupling in donor-bridge-acceptor triad systems, two Mo2 dimers, [Mo2(DAniF)3]2[μ-1,4-{C(O)NH}2-Naph] (1, DAniF = N,N'-di(p-anisyl)formamidinate and Naph = naphthalenyl) and [Mo2(DAniF)3]2[μ-1,4-(CS2)2-2,5-Me2C6H2] (2), have been synthesized and structurally characterized. These two compounds feature a large dihedral angle (>60°) between the central aromatic ring and the plane defined by the Mo-Mo bond vectors, which is distinct from the previously reported phenylene bridged analogues [Mo2(DAniF)3]2[μ-1,4-{C(O)NH}2-ph] (I) and [Mo2(DAniF)3]2[μ-1,4-(CS2)2-C6H4] (II), respectively. Unusual optical behaviors are observed for the mixed-valence (MV) species (1(+) and 2(+)), generated by single-electron oxidation. While 2(+) exhibits a weak intervalence charge transfer (IVCT) absorption band in the near-IR region, the IVCT band is absent in the spectrum of 1(+), which is quite different from what observed for I(+) and II(+). Optical analyses, based on superexchange formalism and Hush model, indicate that, in terms of Robin-Day classification, mixed-valence species 1(+) belongs to the electronically uncoupled Class I and complex 2(+), with Hab = 220 cm(-1), is assigned to the weakly coupled Class II. Together with I(+) and II(+), the four MV complexes complete a transition from Class I to Class II-III borderline as a result of manipulating the geometric topology of the bridge. Given the structural and electronic features for the molecular systems, the impacts of electrostatic interaction (through-space) and electron resonance (through-bond) on electronic coupling are discussed.
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Affiliation(s)
- Hong Li Zhang
- Department of Chemistry, Jinan University , 601 Huang-Pu Avenue West, Guangzhou 510632, China
| | - Guang Yuan Zhu
- Department of Chemistry, Jinan University , 601 Huang-Pu Avenue West, Guangzhou 510632, China
| | - Gangyi Wang
- Department of Chemistry, Jinan University , 601 Huang-Pu Avenue West, Guangzhou 510632, China
| | - Miao Meng
- Department of Chemistry, Jinan University , 601 Huang-Pu Avenue West, Guangzhou 510632, China
| | - Chun Y Liu
- Department of Chemistry, Jinan University , 601 Huang-Pu Avenue West, Guangzhou 510632, China
| | - Hao Lei
- Department of Chemistry, Jinan University , 601 Huang-Pu Avenue West, Guangzhou 510632, China
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7
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Brown-Xu SE, Chisholm MH, Durr CB, Spilker TF. Metal-metal quadruple bonds supported by 5-ethynylthiophene-2-carboxylato ligands: preparation, molecular and electronic structures, photoexcited state dynamics, and application as molecular synthons. J Am Chem Soc 2013; 135:8254-9. [PMID: 23705765 DOI: 10.1021/ja400508u] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
From the reaction between M2(T(i)PB)4 and 2 equiv of 5-ethynylthiophene-2-carboxylic acid (H-ThCCH) in toluene, the complexes trans-M2(T(i)PB)2(ThCCH)2, where M = Mo (I) or W (II) and T(i)PB = 2,4,6-triisopropyl benzoate, have been isolated and characterized by (1)H NMR, IR, MALDI-TOF MS, UV-vis, steady-state emission, transient absorption, and time-resolved infrared (TRIR) spectroscopies and single-crystal X-ray crystallography for I. The molecular structure of I confirms the trans-substitution pattern and the extended conjugation of the ethynylthienyl ligands via interaction with the Mo2δ orbital. The HOMO of both I and II is the M2δ orbital, and the intense color of the compounds (I is red and II is blue) is due to the M2δ-to-ThCCH (1)MLCT transition. The S1 states for I and II are (1)MLCT. The T1 state is (3)MLCT for II, but (3)MoMoδδ* for I. The TRIR spectra of the ν(C≡C) stretch in the MLCT states are consistent with the delocalization of the electron over both ThCCH ligands. Compound I is shown to be a synthon for the preparation of trans-Mo2(T(i)PB)2(ThCCPh)2 (III) and trans-Mo2(T(i)PB)2(ThCCAuPPh3)2 (IV). Both III and IV have been characterized spectroscopically and by single-crystal X-ray diffraction. The structure of III indicates the extended π-conjugation of the trans-ethynyl-thienyl units extends to the added phenyl rings.
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Affiliation(s)
- Samantha E Brown-Xu
- Department of Chemistry and Biochemistry, The Ohio State University , Columbus, Ohio 43210, United States
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9
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Brown-Xu SE, Chisholm MH, Durr CB, Gustafson TL, Spilker TF. Coordination of N,N-Chelated Re(CO)3Cl Units Across a Mo2 Quadruple Bond: Synthesis, Characterization, and Photophysical Properties of a Re–Mo2–Re Triad and Its Component Pieces. J Phys Chem A 2013; 117:5997-6006. [DOI: 10.1021/jp311830h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Samantha E. Brown-Xu
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Malcolm H. Chisholm
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Christopher B. Durr
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Terry L. Gustafson
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Thomas F. Spilker
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
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Chisholm MH, Gustafson TL, Turro C. Photophysical properties of MM quadruply bonded complexes supported by carboxylate ligands, MM = Mo2, MoW, or W2. Acc Chem Res 2013; 46:529-38. [PMID: 23145921 DOI: 10.1021/ar3002206] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
While chemists have extensively studied the photophysical properties of d(6), d(8), and d(10) transition metal complexes, their early transition metal counterparts have received less attention. Quadruply bonded complexes of molybdenum and tungsten supported by carboxylate ligands have intense metal-to-ligand charge transfer (MLCT) absorptions that arise from the electronic coupling of the metal-metal (MM) δ orbital with the CO(2) π-system. This coupling may in turn be linked to an extended π-conjugated organic functional group. The major interaction is akin to the so-called back-bonding in metal carbonyl complexes. By the appropriate selection of MM, its attendant ligands, and the organic group, this absorption can be tuned to span the visible and near IR range, from 400 to 1000 nm. Consequently, these complexes offer potential as photon harvesters for photovoltaic devices and photocatalysis. In this Account, we describe recent studies of dinuclear M(II) containing complexes, where M = Mo or W, and show that there are both parallels and disparities to the monomeric transition metal complexes. These early transition metal complexes have relatively long lived excited state singlets when compared to other transition metal complexes. They also often show unusual dual emission (fluorescence and phosphorescence), with singlet (S(1)) lifetimes that range from 1 to 20 ps, and triplet (T(1)) lifetimes from 3 ns to 200 μs. The fluorescent S(1) states are typically (1)MLCT for both M = Mo and W. These extended singlet lifetimes are uncommon for mononuclear transition metal complexes, which typically have very short lived (1)MLCT states due to rapid femto-second intersystem crossing rates. However, the T(1) states differ. This phosphorescence is MLCT in nature when M = W, while this emission comes from the δδ* state for M = Mo. Through time-resolved femtosecond infrared spectroscopy, we can detect the asymmetric stretch of the CO(2) ligand in both the singlet and triplet δδ* states. Through these analytical methods, we can study how the charge distribution in the singlet and triplet excited states changes over time. In addition, we can detect delocalized or localized examples of MLCT states, which represent class III and I excited state mixed valence in the Robin and Day scheme.
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Affiliation(s)
- Malcolm H. Chisholm
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210-1185, United States
| | - Terry L. Gustafson
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210-1185, United States
| | - Claudia Turro
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210-1185, United States
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Brown-Xu SE, Chisholm MH, Durr CB, Gustafson TL, Naseri V, Spilker TF. Electronic Structure and Excited-State Dynamics of the Molecular Triads: trans-M2(TiPB)2[O2CC6H5-η6-Cr(CO)3]2, Where M = Mo or W, and TiPB = 2,4,6-triisopropylbenzoate. J Am Chem Soc 2012. [DOI: 10.1021/ja310651y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Samantha E. Brown-Xu
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Malcolm H. Chisholm
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Christopher B. Durr
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Terry L. Gustafson
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Vesal Naseri
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Thomas F. Spilker
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
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Chisholm MH. Incorporating MM Quadruple Bonds Into Conjugated Organic Oligomers: Syntheses and Optoelectronic Properties. MACROMOL CHEM PHYS 2012. [DOI: 10.1002/macp.201100656] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Brown-Xu SE, Chisholm MH, Gallucci JC, Ghosh Y, Gustafson TL, Reed CR. Furan- and selenophene-2-carboxylato derivatives of dimolybdenum and ditungsten (M[quadruple bond]M): a comparison of their chemical and photophysical properties. Dalton Trans 2012; 41:2257-63. [PMID: 22186951 DOI: 10.1039/c1dt11889g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
From the reactions between M(2)(T(i)PB)(4), where T(i)PB = 2,4,6-triisopropylbenzoate and two equivalents each of 2-furan carboxylic acid, FuCO(2)H, and 2-selenophene carboxylic acid, SpCO(2)H in toluene, the new compounds trans-M(2)(T(i)PB)(2)(O(2)CFu)(2) (1a M = Mo, 2a M = W) and trans-M(2)(T(i)PB)(2)(O(2)CSp)(2) (1b M = Mo, 2b M = W) were formed. These new compounds have been characterized by (1)H NMR, steady-state UV-Vis-NIR absorption and emission spectroscopy, cyclic and differential pulse voltammetry, and fs and ns transient absorption spectroscopy. The compound Mo(2)(T(i)PB)(2)(O(2)CSp)(2) (1b) has been characterized by single crystal X-ray crystallography. These data are compared with those previously reported for related 2-thiophene carboxylate derivatives: M(2)(T(i)PB)(2)(O(2)CTh)(2). The physico-chemical data correlate well with electronic structure calculations performed on model compounds. All compounds have detectible S(1) photoexcited states with lifetimes that vary from ∼5 ps to < 1 ps. The molybdenum compounds have T(1) states with microsecond lifetimes that are assigned as MMδδ* whereas the T(1) states for tungsten are (3)MLCT with lifetimes on the order of nanoseconds. In all cases, shorter lifetimes were seen in complexes containing heavier atoms.
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Affiliation(s)
- Samantha E Brown-Xu
- Department of Chemistry, The Ohio State University, 100 W 18th Ave., Columbus, Ohio 43210, USA
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Alberding BG, Brown-Xu SE, Chisholm MH, Gallucci JC, Gustafson TL, Naseri V, Reed CR, Turro C. Molecular and electronic structures and photophysical properties of quadruply bonded dimetal complexes (M = Mo or W) supported by trans-arylethynylcarboxylate ligands where aryl = p-tolyl or 9-anthrancenyl. Dalton Trans 2012; 41:12270-81. [DOI: 10.1039/c2dt31359f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Alberding BG, Brown-Xu SE, Chisholm MH, Gustafson TL, Reed CR, Naseri V. Photophysical properties of MM quadruply bonded complexes (M = Mo, W) supported by carboxylate ligands: charge delocalization and dynamics in S1 and T1 states. Dalton Trans 2012; 41:13097-104. [DOI: 10.1039/c2dt30490b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Alberding BG, Chisholm MH, Gustafson TL, Liu Y, Reed CR, Turro C. Photophysical studies of trans-bis(phenylethynyldiisopropylamidinato)bis(acetato)dimetal complexes involving MM quadruple bonds where M = Mo or W. J Phys Chem A 2010; 114:12675-81. [PMID: 21067133 DOI: 10.1021/jp108544v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The title compounds trans-M(2)(O(2)CMe)(2)[C((i)PrN)(2)C≡C-Ph](2), I (M = Mo) and II (M = W), show electronic absorptions in the visible region of the spectrum assignable to (1)MLCT [M(2)δ to phenylethynylamidinate π*]. These compounds show dual emission from S(1) and T(1) states. For both I and II, S(1) is (1)MLCT, but for I the T(1) state is shown to be MMδδ* while for II T(1) is (3)MLCT. The lifetimes of the S(1) and T(1) states have been determined by femtosecond and nanosecond transient absorption spectroscopy: for I S(1) ∼ 20 ps and T(1) ∼ 100 μs and for II S(1) ∼ 6 ps and T(1) ∼ 5 μs. From solvent dependence of the absorption and emission spectra, we suggest that the S(1) states are localized on one amidinate ligand though the initial absorption is to a delocalized state.
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Affiliation(s)
- Brian G Alberding
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210-1185, United States
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Electronically Coupled MM Quadruple Bonded Complexes of Molybdenum and Tungsten. STRUCTURE AND BONDING 2010. [DOI: 10.1007/978-3-642-05243-9_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
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Alberding BG, Barybin MV, Chisholm MH, Gustafson TL, Reed CR, Robinson RE, Patmore NJ, Singh N, Turro C. Molecular, electronic structure and spectroscopic properties of MM quadruply bonded units supported by trans-6-carboethoxy-2-carboxylatoazulene ligands. Dalton Trans 2010; 39:1979-84. [DOI: 10.1039/b919282d] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Alberding BG, Chisholm MH, Chou YH, Ghosh Y, Gustafson TL, Liu Y, Turro C. 2-Thienylcarboxylato and 2-Thienylthiocarboxylato Ligands Bonded to MM Quadruple Bonds (M = Mo or W): A Comparison of Ground State, Spectroscopic and Photoexcited State Properties. Inorg Chem 2009; 48:11187-95. [DOI: 10.1021/ic901607u] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Brian G. Alberding
- Department of Chemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210
| | - Malcolm H. Chisholm
- Department of Chemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210
| | - Yi-Hsuan Chou
- Department of Chemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210
| | - Yagnaseni Ghosh
- Department of Chemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210
| | - Terry L. Gustafson
- Department of Chemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210
| | - Yao Liu
- Department of Chemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210
| | - Claudia Turro
- Department of Chemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210
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Alberding BG, Chisholm MH, Chou YH, Gallucci JC, Ghosh Y, Gustafson TL, Patmore NJ, Reed CR, Turro C. Quadruply bonded dimetal units supported by 2,4,6-triisopropylbenzoates MM(TiPB)(4) (MM = Mo(2), MoW, and W(2)): preparation and photophysical properties. Inorg Chem 2009; 48:4394-9. [PMID: 19378951 DOI: 10.1021/ic900092c] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The preparation and characterization (elemental analysis, (1)H NMR, and cyclic voltammetry) of the new compounds MM(TiPB)(4), where MM = MoW and W(2) and TiPB = 2,4,6-triisopropylbenzoate, are reported. Together with Mo(2)(TiPB)(4), previously reported by Cotton et al. (Inorg. Chem. 2002, 41, 1639), the new compounds have been studied by electronic absorption, steady-state emission, and transient absorption spectroscopy (femtosecond and nanosecond). The compounds show strong absorptions in the visible region of the spectrum that are assigned to MMdelta to arylcarboxylate pi* transitions, (1)MLCT. Each compound also shows luminescence from two excited states, assigned as the (1)MLCT and (3)MMdeltadelta* states. The energy of the emission from the (1)MLCT state follows the energy ordering MM = Mo(2) > MoW > W(2), but the emission from the (3)MMdeltadelta* state follows the inverse order: MM = W(2) > MoW > Mo(2). Evidence is presented to support the view that the lower energy emission in each case arises from the (3)MMdeltadelta* state. Lifetimes of the (1)MLCT states in these systems are approximately 0.4-6 ps, whereas phosphorescence is dependent on the MM center: Mo(2) approximately 40 micros, MoW approximately 30 micros, and W(2) approximately 1 micros.
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Affiliation(s)
- Brian G Alberding
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210-1185, USA
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MacNeill CM, Day CS, Noftle RE. Bis(μ-dithieno[3,2-b:2',3'-d]thio-phene-2,6-dicarboxyl-ato-κO:O)bis-[bis-(1,10-phenanthroline-κN,N')cobalt(II)] dimethyl-formamide disolvate. Acta Crystallogr Sect E Struct Rep Online 2009; 65:m486. [PMID: 21583738 PMCID: PMC2977552 DOI: 10.1107/s1600536809011337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2009] [Accepted: 03/26/2009] [Indexed: 05/30/2023]
Abstract
The asymmetric unit of the title compound, [Co(2)(C(10)H(2)O(4)S(3))(2)(C(12)H(8)N(2))(4)]·2C(3)H(7)NO, contains one half of the formula unit, with the rest generated by inversion. The cobalt ion sits in a slightly distorted octa-hedral environment and is ligated to four N atoms of two 1,10-phenanthroline molecules and to two O atoms of two dithieno[3,2-b:2',3'-d]thio-phene-2,6-dicarb-oxy-l-ate anions. The anions act as bridges between the Co(II) centers.
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Affiliation(s)
| | - Cynthia S. Day
- Department of Chemistry, Wake Forest University, Winston-Salem, NC 27109, USA
| | - Ronald E. Noftle
- Department of Chemistry, Wake Forest University, Winston-Salem, NC 27109, USA
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Mishra A, Ma CQ, Bäuerle P. Functional Oligothiophenes: Molecular Design for Multidimensional Nanoarchitectures and Their Applications. Chem Rev 2009; 109:1141-276. [DOI: 10.1021/cr8004229] [Citation(s) in RCA: 1228] [Impact Index Per Article: 81.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Amaresh Mishra
- Institute of Organic Chemistry II and Advanced Materials, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Chang-Qi Ma
- Institute of Organic Chemistry II and Advanced Materials, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Peter Bäuerle
- Institute of Organic Chemistry II and Advanced Materials, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
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[Bis(trispivalatodimolybdenum (II))-μ-bis(4′-carboxylato-2,2′:6′,2″-terpyridine) ruthenium (II)] (2+) Tetrafluoroborate: Photophysical Studies. J CLUST SCI 2009. [DOI: 10.1007/s10876-009-0232-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Chisholm MH, Singh N. Are tetrathiooxalate and diborinate bridged compounds related to oxalate bridged quadruply bonded compounds of molybdenum? Dalton Trans 2009:5867-72. [DOI: 10.1039/b901734h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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The remarkable influence of M2delta to thienyl pi conjugation in oligothiophenes incorporating MM quadruple bonds. Proc Natl Acad Sci U S A 2008; 105:15247-52. [PMID: 18832150 DOI: 10.1073/pnas.0807411105] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Oligothiophenes incorporating MM quadruple bonds have been prepared from the reactions between Mo(2)(TiPB)(4) (TiPB = 2,4,6-triisopropyl benzoate) and 3',4'-dihexyl-2,2'-:5',2''-terthiophene-5,5''-dicarboxylic acid. The oligomers of empirical formula Mo(2)(TiPB)(2)(O(2)C(Th)-C(4)(n-hexyl)(2)S-(Th)CO(2)) are soluble in THF and form thin films with spin-coating (Th = thiophene). The reactions between Mo(2)(TiPB)(4) and 2-thienylcarboxylic acid (Th-H), 2,2'-bithiophene-5-carboxylic acid (BTh-H), and (2,2':5',2''-terthiophene)-5-carboxylic acid (TTh-H) yield compounds of formula trans-Mo(2)(TiPB)(2)L(2), where L = Th, BTh, and TTh (the corresponding thienylcarboxylate), and these compounds are considered as models for the aforementioned oligomers. In all cases, the thienyl groups are substituted or coupled at the 2,5 positions. Based on the x-ray analysis, the molecular structure of trans-Mo(2)(TiPB)(2)(BTh)(2) reveals an extended Lpi-M(2)delta-Lpi conjugation. Calculations of the electronic structures on model compounds, in which the TiPB are substituted by formate ligands, reveal that the HOMO is mainly attributed to the M(2)delta orbital, which is stabilized by back-bonding to one of the thienylcarboxylate pi* combinations, and the LUMO is an in-phase combination of the thienylcarboxylate pi* orbitals. The compounds and the oligomers are intensely colored due to M(2)delta-thienyl carboxylate pi* charge transfer transitions that fall in the visible region of the spectrum. For the molybdenum complexes and their oligomers, the photophysical properties have been studied by steady-state absorption spectroscopy and emission spectroscopy, together with time-resolved emission and transient absorption for the determination of relaxation dynamics. Remarkably, THF solutions the molybdenum complexes show room-temperature dual emission, fluorescence and phosphorescence, originating mainly from (1)MLCT and (3)MM(deltadelta*) states, respectively. With increasing number of thienyl rings from 1 to 3, the observed lifetimes of the (1)MLCT state increase from 4 to 12 ps, while the phosphorescence lifetimes are approximately 80 micros. The oligomers show similar photophysical properties as the corresponding monomers in THF but have notably longer-lived triplet states, approximately 200 micros in thin films. These results, when compared with metallated oligothiophenes of the later transition elements, reveal that M(2)delta-thienyl pi conjugation leads to a very small energy gap between the (1)MLCT and (3)MLCT states of <0.6 eV.
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