1
|
Hutzler D, Stallhofer K, Kienberger R, Riedle E, Iglev H. Icelike Vibrational Properties of Strong Hydrogen Bonds in Hydrated Lithium Nitrate. J Phys Chem A 2020; 124:5784-5789. [PMID: 32574493 DOI: 10.1021/acs.jpca.0c01588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The hydrogen bond network accounts for many of the extraordinary physical properties of liquid water and ice. Its vibrational dynamics are quite complex in their entirety but can be accessed in detail by investigating small groups of only a few water molecules. Here, aqueous salt hydrates turned out to be an exceptional model system for water molecules arranged in well-defined geometrical structures that can be accessed by means of femtosecond spectroscopy of the OH stretching vibration. In this study, we find striking resemblance between the vibrational properties of three water molecules connected via strong hydrogen bonds in the trihydrate of LiNO3 and those of ordinary ice Ih. As in ice, the vibrations of the hydrate water molecules show ultrafast excited state dynamics that are strongly accelerated when proceeding from deuterated to neat H2O samples. The latter is analyzed by means of an additional relaxation channel that is due to Fermi resonance between the OH stretching vibration and the bend overtone accompanied by delocalization of the vibration over neighboring water molecules in the H2O species. Moreover, in the hydrate and ice samples severe spectral broadening is examined when comparing fundamental and excited state absorption bands. Here, proton delocalization along the strong hydrogen bonds is given as a possible underlying mechanism.
Collapse
Affiliation(s)
- Daniel Hutzler
- Physik-Department E11, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany
| | - Klara Stallhofer
- Physik-Department E11, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany
| | - Reinhard Kienberger
- Physik-Department E11, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany
| | - Eberhard Riedle
- Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität München, Oettingenstraßsse 67, 80538 München, Germany
| | - Hristo Iglev
- Physik-Department E11, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany
| |
Collapse
|
2
|
Guo P, Gong J, Sadasivam S, Xia Y, Song TB, Diroll BT, Stoumpos CC, Ketterson JB, Kanatzidis MG, Chan MKY, Darancet P, Xu T, Schaller RD. Slow thermal equilibration in methylammonium lead iodide revealed by transient mid-infrared spectroscopy. Nat Commun 2018; 9:2792. [PMID: 30022022 PMCID: PMC6052157 DOI: 10.1038/s41467-018-05015-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Accepted: 05/21/2018] [Indexed: 11/21/2022] Open
Abstract
Hybrid organic-inorganic perovskites are emerging semiconductors for cheap and efficient photovoltaics and light-emitting devices. Different from conventional inorganic semiconductors, hybrid perovskites consist of coexisting organic and inorganic sub-lattices, which present disparate atomic masses and bond strengths. The nanoscopic interpenetration of these disparate components, which lack strong electronic and vibrational coupling, presents fundamental challenges to the understanding of charge and heat dissipation. Here we study phonon population and equilibration processes in methylammonium lead iodide (MAPbI3) by transiently probing the vibrational modes of the organic sub-lattice following above-bandgap optical excitation. We observe inter-sub-lattice thermal equilibration on timescales ranging from hundreds of picoseconds to a couple of nanoseconds. As supported by a two-temperature model based on first-principles calculations, the slow thermal equilibration is attributable to the sequential phonon populations of the inorganic and organic sub-lattices, respectively. The observed long-lasting thermal non-equilibrium offers insights into thermal transport and heat management of the emergent hybrid material class.
Collapse
Affiliation(s)
- Peijun Guo
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL, 60439, USA
| | - Jue Gong
- Department of Chemistry and Biochemistry, Northern Illinois University, 1425W. Lincoln Hwy., DeKalb, IL, 60115, USA
| | - Sridhar Sadasivam
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL, 60439, USA
| | - Yi Xia
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL, 60439, USA
| | - Tze-Bin Song
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - Benjamin T Diroll
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL, 60439, USA
| | - Constantinos C Stoumpos
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - John B Ketterson
- Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - Mercouri G Kanatzidis
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - Maria K Y Chan
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL, 60439, USA
| | - Pierre Darancet
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL, 60439, USA
| | - Tao Xu
- Department of Chemistry and Biochemistry, Northern Illinois University, 1425W. Lincoln Hwy., DeKalb, IL, 60115, USA
| | - Richard D Schaller
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL, 60439, USA.
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA.
| |
Collapse
|
3
|
Hutzler D, Brunner C, Petkov PS, Heine T, Fischer SF, Riedle E, Kienberger R, Iglev H. Dynamics of the OH stretching mode in crystalline Ba(ClO 4) 2·3H 2O. J Chem Phys 2018; 148:054307. [PMID: 29421900 DOI: 10.1063/1.5007040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The vibrational dynamics of the OH stretching mode in Ba(ClO4)2 trihydrate are investigated by means of femtosecond infrared spectroscopy. The sample offers plane cyclic water trimers in the solid phase that feature virtually no hydrogen bond interaction between the water molecules. Selective excitation of the symmetric and asymmetric stretching leads to fast population redistribution, while simultaneous excitation yields quantum beats, which are monitored via a combination tone that dominates the overtone spectrum. The combination of steady-state and time-resolved spectroscopy with quantum chemical simulations and general theoretical considerations gives indication of various aspects of symmetry breakage. The system shows a joint population lifetime of 8 ps and a long-lived coherence between symmetric and asymmetric stretching, which decays with a time constant of 0.6 ps.
Collapse
Affiliation(s)
- Daniel Hutzler
- Physik-Department, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany
| | - Christian Brunner
- Physik-Department, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany
| | - Petko St Petkov
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstraße 2, D-04103 Leipzig, Germany
| | - Thomas Heine
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstraße 2, D-04103 Leipzig, Germany
| | - Sighart F Fischer
- Physik-Department, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany
| | - Eberhard Riedle
- Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität München, Oettingenstraße 67, D-80538 München, Germany
| | - Reinhard Kienberger
- Physik-Department, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany
| | - Hristo Iglev
- Physik-Department, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany
| |
Collapse
|