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Djouama R, Hamza Reguig F, Bounaceur B, Dauchez M, Krallafa AM. Structure, Dynamics, and Photophysical Properties of a Series of [Pt(NH 2R) 4]–[PtX 4] Complexes. J Phys Chem A 2020; 124:911-923. [DOI: 10.1021/acs.jpca.9b10300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rabie Djouama
- LCPM Laboratory, Faculty of Sciences, Chemistry Department, University of Oran 1 Ahmed BenBella, 31000 Oran, Algeria
| | - Farouk Hamza Reguig
- LCPM Laboratory, Faculty of Sciences, Chemistry Department, University of Oran 1 Ahmed BenBella, 31000 Oran, Algeria
| | - Boumediene Bounaceur
- LCPM Laboratory, Faculty of Sciences, Chemistry Department, University of Oran 1 Ahmed BenBella, 31000 Oran, Algeria
| | - Manuel Dauchez
- SirMa CNRS UMR 7369, MEDyC, University of Reims Champagne Ardenne, Reims 51097, France
| | - Abdelghani Mohamed Krallafa
- LCPM Laboratory, Faculty of Sciences, Chemistry Department, University of Oran 1 Ahmed BenBella, 31000 Oran, Algeria
- SirMa CNRS UMR 7369, MEDyC, University of Reims Champagne Ardenne, Reims 51097, France
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2
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Pejov L, Panda MK, Moriwaki T, Naumov P. Probing Structural Perturbation in a Bent Molecular Crystal with Synchrotron Infrared Microspectroscopy and Periodic Density Functional Theory Calculations. J Am Chem Soc 2017; 139:2318-2328. [DOI: 10.1021/jacs.6b11212] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Ljupčo Pejov
- Institute
of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, MK−1000 Skopje, Macedonia
| | - Manas K. Panda
- New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, United Arab Emirates
| | - Taro Moriwaki
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Panče Naumov
- Institute
of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, MK−1000 Skopje, Macedonia
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Gojzewski H, Kappl M, Kircher G, Koczorowski W, Butt HJ, Ptak A. Nanoadhesion on rigid methyl-terminated biphenyl thiol monolayers: a high-rate dynamic force spectroscopy study. Chemphyschem 2013; 14:543-9. [PMID: 23345021 DOI: 10.1002/cphc.201200877] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2012] [Indexed: 11/07/2022]
Abstract
Nanoadhesion on a self-assembled monolayer of 4-methyl-4'-mercaptobiphenyl is measured using a modified atomic force microscope. The dependence of the adhesion force on the loading rate is analyzed with the Dudko-Hummer-Szabo model, and the kinetic and interaction potential parameters for a single terminal group are extracted. The energy and location of the activation barrier suggest that the adhesion is dominated by van der Waals dispersion forces. The humidity effect on the nanoadhesion is also studied. The results are compared with previously measured values for methyl-terminated alkane thiols and the influence of the thiol rigidity on the adhesion force is discussed.
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Affiliation(s)
- Hubert Gojzewski
- Institute of Physics, Poznan University of Technology, Nieszawska 13A, PL-60965 Poznan, Poland
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4
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Xu Z, Yang L, Butler IS. Pressure-tuning, FT-Raman spectra of m-phthalic acid, m-C6H4(COOH)2, and a gadolinium(III) m-phthalate salt. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.04.090] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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5
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Suffren Y, Rollet FG, Reber C. RAMAN SPECTROSCOPY OF TRANSITION METAL COMPLEXES: MOLECULAR VIBRATIONAL FREQUENCIES, PHASE TRANSITIONS, ISOMERS, AND ELECTRONIC STRUCTURE. COMMENT INORG CHEM 2011. [DOI: 10.1080/02603594.2012.659776] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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6
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Xu Z, Christendat D, Butler IS. Pressure-tuning infrared spectroscopic study of trans-di-N-thiocyanato-bis(tribenzylphosphine)nickel(II), trans-Ni[(PhCH2)3P]2(NCS)2. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2010.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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7
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Su L, Li M, Zhu X, Wang Z, Chen Z, Li F, Zhou Q, Hong S. In Situ Crystallization of Low-Melting Ionic Liquid [BMIM][PF6] under High Pressure up to 2 GPa. J Phys Chem B 2010; 114:5061-5. [DOI: 10.1021/jp912191z] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Lei Su
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Min Li
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Xiang Zhu
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Zheng Wang
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Zhenping Chen
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Fangfei Li
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Qiang Zhou
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Shiming Hong
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
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8
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Hernández I, Gillin WP. Influence of High Hydrostatic Pressure on Alq3, Gaq3, and Inq3 (q = 8-Hydroxyquinoline). J Phys Chem B 2009; 113:14079-86. [DOI: 10.1021/jp905108x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ignacio Hernández
- Queen Mary University of London, Centre for Materials Research, Department of Physics, Mile End Road, London E1 4NS, United Kingdom
| | - William P. Gillin
- Queen Mary University of London, Centre for Materials Research, Department of Physics, Mile End Road, London E1 4NS, United Kingdom
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Hernández I, Tan RHC, Pearson JM, Wyatt PB, Gillin WP. Nonradiative De-excitation Mechanisms in Long-Lived Erbium(III) Organic Compounds ErxY1-x[(p-CF3-C6F4)2PO2]3. J Phys Chem B 2009; 113:7474-81. [DOI: 10.1021/jp810932s] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ignacio Hernández
- Department of Physics, and School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, U.K
| | - R. H. C. Tan
- Department of Physics, and School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, U.K
| | - J. M. Pearson
- Department of Physics, and School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, U.K
| | - P. B. Wyatt
- Department of Physics, and School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, U.K
| | - W. P. Gillin
- Department of Physics, and School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, U.K
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10
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Kim HJ, Kim SB, Kim JK, Jung YM. Hydrostatic Pressure Effect on the Phase Transitions of a Closed-Loop Type Block Copolymer by Using 2D FTIR Correlation Spectroscopy. J Phys Chem B 2008; 112:15295-300. [DOI: 10.1021/jp806019n] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hye Jeong Kim
- National Creative Research Center for Block Copolymer Self-Assembly, Department of Chemical Engineering, Department of Chemistry, Pohang University of Science and Technology, Kyungbuk 790-784, Korea, and Department of Chemistry, Kangwon National University, Chunchon 200-701, Korea
| | - Seung Bin Kim
- National Creative Research Center for Block Copolymer Self-Assembly, Department of Chemical Engineering, Department of Chemistry, Pohang University of Science and Technology, Kyungbuk 790-784, Korea, and Department of Chemistry, Kangwon National University, Chunchon 200-701, Korea
| | - Jin Kon Kim
- National Creative Research Center for Block Copolymer Self-Assembly, Department of Chemical Engineering, Department of Chemistry, Pohang University of Science and Technology, Kyungbuk 790-784, Korea, and Department of Chemistry, Kangwon National University, Chunchon 200-701, Korea
| | - Young Mee Jung
- National Creative Research Center for Block Copolymer Self-Assembly, Department of Chemical Engineering, Department of Chemistry, Pohang University of Science and Technology, Kyungbuk 790-784, Korea, and Department of Chemistry, Kangwon National University, Chunchon 200-701, Korea
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11
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Mínguez Espallargas G, Brammer L, Allan DR, Pulham CR, Robertson N, Warren JE. Noncovalent Interactions under Extreme Conditions: High-Pressure and Low-Temperature Diffraction Studies of the Isostructural Metal−Organic Networks (4-Chloropyridinium)2[CoX4] (X = Cl, Br). J Am Chem Soc 2008; 130:9058-71. [DOI: 10.1021/ja8010868] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Guillermo Mínguez Espallargas
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K., School of Chemistry, University of Edinburgh, King’s Buildings, Edinburgh EH9 3JJ, U.K., Diamond Light Source, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, U.K., and Synchrotron Radiation Source, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K
| | - Lee Brammer
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K., School of Chemistry, University of Edinburgh, King’s Buildings, Edinburgh EH9 3JJ, U.K., Diamond Light Source, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, U.K., and Synchrotron Radiation Source, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K
| | - David R. Allan
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K., School of Chemistry, University of Edinburgh, King’s Buildings, Edinburgh EH9 3JJ, U.K., Diamond Light Source, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, U.K., and Synchrotron Radiation Source, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K
| | - Colin R. Pulham
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K., School of Chemistry, University of Edinburgh, King’s Buildings, Edinburgh EH9 3JJ, U.K., Diamond Light Source, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, U.K., and Synchrotron Radiation Source, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K
| | - Neil Robertson
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K., School of Chemistry, University of Edinburgh, King’s Buildings, Edinburgh EH9 3JJ, U.K., Diamond Light Source, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, U.K., and Synchrotron Radiation Source, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K
| | - John E. Warren
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K., School of Chemistry, University of Edinburgh, King’s Buildings, Edinburgh EH9 3JJ, U.K., Diamond Light Source, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, U.K., and Synchrotron Radiation Source, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K
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12
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Yang Y, Liu X, Nakamura A, Binnemans K, Liu J. Pressure-induced phase transitions on a liquid crystalline europium(III) complex. J Phys Chem B 2008; 112:5291-5. [PMID: 18386940 DOI: 10.1021/jp7119763] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effect of pressure on the phase behavior of the liquid crystalline complex [Eu(bta)(3)L(2)] (bta is benzoyltrifluoroacetonate, and L is the Schiff base 2-hydroxy-N-octadecyl-4-tetradecyloxybenzaldimine) was studied by X-ray diffraction, Raman spectroscopy, and luminescence spectroscopy. The pressure was varied between ambient pressure and 8.0 GPa. [Eu(bta)(3)L(2)] exhibits a smectic A (SmA) phase at room temperature. The complex undergoes a transition from the SmA phase to a solid lamellar structure around 0.22 GPa and another transition from the solid lamellar phase to an amorphous state from 1.6 to 3.5 GPa. At low pressures, the smectic layer spacing increases, and the intermolecular distance decreases. Above 3.5 GPa, both the interlamellar and the intermolecular spacings hardly change, but the intensity of X-ray reflections exhibits a remarkable decrease and eventually vanishes. An interpretation of the changes in the molecular structure is given. It was found that less interdigitation of the alkyl chains situated in adjacent layers and/or a full extension of the alkyl chains occurred at low pressures and that the second phase transition was accompanied by a transfer of the hydrogen atom from the nitrogen atom of the imine group to the oxygen atom of the Schiff base ligand. The effect of applying pressure equals that of the lanthanide contraction on the phase behavior.
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Affiliation(s)
- Yuetao Yang
- Key Laboratory of Modern Acoustics of MOE, Institute of Acoustics, Nanjing University, Nanjing 210093, China
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13
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14
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Garimella SV, Drozd V, Durygin A. High-pressure Raman study on the decomposition of crystalline Cr(CO)6. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.02.048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Johnstone RDL, Francis D, Lennie AR, Marshall WG, Moggach SA, Parsons S, Pidcock E, Warren JE. High-pressure polymorphism in L-serine monohydrate: identification of driving forces in high pressure phase transitions and possible implications for pressure-induced protein denaturation. CrystEngComm 2008. [DOI: 10.1039/b810746g] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Safa M, Dong Z, Song Y, Huang Y. Examining the structural changes in Fe2(CO)9 under high external pressures by Raman spectroscopy. CAN J CHEM 2007. [DOI: 10.1139/v07-096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Pressure-induced structural changes in di-iron nonacarbonyl [Fe2(CO)9] were examined by in situ Raman spectroscopy with the aid of a diamond anvil cell. Our results indicate that Fe2(CO)9 undergoes a pressure-induced phase transformation at about 0.9 GPa. Upon further compression, another structural transformation is identified at 7 GPa. In the low-pressure phase below 0.9 GPa, the π back-bonding between metal and carbonyl increases with increasing pressure. In the high-pressure phase above 7 GPa, the combination of high-pressure and laser irradiation induces a change in structure from Fe2(CO)9 to Fe2(CO)8. Fe2(CO)8 appears to adopt a structure with C2v rather than D3d or D2h symmetry. The metal–metal bond is gradually weakened under high pressures, and Fe2(CO)8 eventually decomposes by breaking the Fe–Fe bond when compressed up to 17.7 GPa.Key words: metal carbonyl, Raman spectroscopy, high pressure, diamond anvil cell.
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Xu Z, Wharf I, Butler IS. Pressure-tuning Raman and infrared spectra of N-thiocyanato[tris(o-tolyl)]tin(IV), (o-CH3C6H4)3SnNCS. J Mol Struct 2006. [DOI: 10.1016/j.molstruc.2006.04.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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18
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Xu Z, Kapoor PN, Butler IS. Pressure-tuning infrared and Raman spectra of trans-dichloro-bis[(diperfluoroethyl)phenylphosphine]platinum(II), trans-Pt[PPh(CF3CF2)2]2Cl2. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2006.05.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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19
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Casati N, Macchi P, Sironi A. Staggered to Eclipsed Conformational Rearrangement of [Co2(CO)6(PPh3)2] in the Solid State: An X-ray Diffraction Study at High Pressure and Low Temperature. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200502241] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Casati N, Macchi P, Sironi A. Staggered to Eclipsed Conformational Rearrangement of [Co2(CO)6(PPh3)2] in the Solid State: An X-ray Diffraction Study at High Pressure and Low Temperature. Angew Chem Int Ed Engl 2005; 44:7736-9. [PMID: 16278912 DOI: 10.1002/anie.200502241] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Nicola Casati
- Dipartimento di Chimica Strutturale e Stereochimica Inorganica, Università degli Studi di Milano and Istituto di Scienze e Tecnologie Molecolari del CNR (ISTM-CNR), Italy
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21
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Xu Z, Butler IS, Mayr A. The pressure tunning Raman and IR spectral studies on the multinuclear metal carbyne complexes. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2005; 61:995-1000. [PMID: 15683808 DOI: 10.1016/j.saa.2004.05.043] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2004] [Accepted: 05/06/2004] [Indexed: 05/24/2023]
Abstract
The Raman and infrared (IR) spectra of four tungsten metal carbyne complexes I, II, IV and V [Cl(CO)2(L)W[triple bond]CC6H4[triple bond](C[triple bond]CC6H4)n[triple bond]N[triple bond]C[triple bond]]2M (L = TMEDA, n = 0, M = PdI2 or ReCl(CO)3; L = DPPE, n = 1, M = PdI2 or ReCl(CO)3) were studied at high external pressure. Their pressure-induced phase transitions were observed near 20kbar (complexes I), 15 kbar (complexes II), 25 kbar (complex IV) and 30 kbar (complex V). The pressure-induced phase transition likely is first order in complex I and the pressure-induced phase transitions of complexes II, IV and V are mostly second order. The pressure sensitivities d nu/dp of nu(W[triple bond]C) are high in the low-pressure phase area and very low in the high-pressure phase area due to the pressure strengthening pi back-bonding from metal W to pi* orbital of C[triple bond]O in fragment Cl(CO)2(L)W[triple bond]C. The pressure strengthening metal pi back-bonding from metal Re or Pd to pi* orbital of C[triple bond]O or C[triple bond]N also happened to both of central metal centers of NCPd(I2)CN in complex I and NCReCl(CO)3CN in complex II.
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Affiliation(s)
- Zhenhua Xu
- State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
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22
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Xu Z, Yang Z, Wu J, Butler IS. The pressure tunning Raman spectral studies of the bilirubinIXalpha and neutral calcium bilirubinate at high external pressure. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2003; 59:2791-2796. [PMID: 14499840 DOI: 10.1016/s1386-1425(03)00108-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The bilirubinIXalpha and its neutral calcium bilirubinate were studied using Raman spectroscopy at high external pressure. The results showed that the bilirubinIXalpha has two pressure-induced phase transitions (15-18 and 30-36 kbar) and three pressure phase areas. Its pressure sensitivities in the low-pressure phase are very low. It is believed that the four internally hydrogen bonds in bilirubinIXalpha molecule cause the atoms to attract each other tightly in the bilirubinIXalpha molecule. Therefore, the low pressure is not strong enough to shorten the bonds significantly. The pressure sensitivities in the middle-pressure phase are much higher than those in the low-pressure phase, but those in the high-pressure phase are slightly lower than in the middle-pressure phase. There is only one pressure-induced phase transition (25-34 kbar) in the neutral calcium bilirubinate. The pressure sensitivities in the low-pressure phase are higher than those in the high-pressure phase as usually.
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Affiliation(s)
- Zhenhua Xu
- State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
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Schoonover JR, Dattelbaum DM, Osborn JC, Bridgewater JS, Kenney JW. Pressure-dependent Fourier transform infrared spectroscopy of a poly (ester urethane). SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2003; 59:309-319. [PMID: 12685905 DOI: 10.1016/s1386-1425(02)00173-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The effects of hydrostatic pressure upon (1) a segmented poly (ester urethane), (2) a hydrolytically degraded sample of the same polymer, and (3) models for the polyurethane and polyester segments in this polymer have been studied by Fourier transform infrared spectroscopy using high-pressure diamond anvil cells (DACs). The pressure responses of the vibrational frequencies of specific functional groups of the poly (ester urethane) in the 0-100-kbar range are compared with data for individual segment models and the partially degraded sample. The results indicated that the polymer is highly stable in this pressure regime, with no measurable degradation or phase changes. Differences in the pressure dependency of specific infrared bands between the poly (ester urethane) sample and the partially degraded sample are slight and consistent with changes in hydrogen-bonding interactions and shorter chain lengths in the degraded sample.
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Affiliation(s)
- Jon R Schoonover
- Polymers and Coatings Group, Materials Science and Technology Division, Los Alamos National Laboratory, Mail Stop E549, Los Alamos, NM 87545, USA.
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Grey JK, Butler IS, Reber C. Effect of Pressure on Coupled Electronic Ground and Excited States Determined from Luminescence Spectra of trans-Dioxorhenium(V) Complexes. J Am Chem Soc 2002; 124:11699-708. [PMID: 12296736 DOI: 10.1021/ja012629n] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pressure-dependent luminescence spectra of trans-dioxo complexes of rhenium(V) with ancillary ethylenediamine ligands exhibit resolved vibronic structure in the O=Re=O symmetric stretching mode at room temperature. The intensity distribution within the vibronic progression changes with pressure, leading to band shapes that are also pressure-dependent. These spectroscopic features arise from coupled electronic states and depend on the energy differences between ground and excited states, which vary by 2500 cm(-1) for the three complexes with ethylenediamine, tetramethylethylenediamine, and tetraethylethylenediamine ancillary ligands. We describe the pressure-dependent vibronic structure and band shapes with anharmonic adiabatic potential energy surfaces for the ground states of all complexes. The calculated spectra reveal the pressure dependence of the energies of electronic origins, luminescence band maximums, offsets between ground- and emitting-state potential minimums, and vibrational frequencies. The largest pressure effects are observed where the coupled electronic states are close in energy.
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Affiliation(s)
- John K Grey
- Department of Chemistry, McGill University, Montreal, Quebec H3A 2K6, Canada
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Xu Z, Mayr A, Butler IS. Raman and infrared spectra and pressure tuning Raman and infrared spectra of multinuclear metal carbyne complexes. J Organomet Chem 2002. [DOI: 10.1016/s0022-328x(01)01395-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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