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Yu P, Zhao Y, Yang F, Pan H, Wang J, Zhao J, Wang W, Wang H, Wang J. Differentiating Two Nitrosylruthenium Isomeric Complexes by Steady-State and Ultrafast Infrared Spectroscopies. J Phys Chem B 2016; 120:11502-11509. [PMID: 27755866 DOI: 10.1021/acs.jpcb.6b08060] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The [Ru(II)-NO+] group affects the structure and chemical reactivity of nitrosylruthenium(II) complexes. A characteristic infrared absorption band due to the nitrosyl (NO) stretching motion is shown in the frequency region 1800-1900 cm-1. In this work, linear infrared (IR) and nonlinear IR methods, including pump-probe and two-dimensional (2D) IR, were utilized to study the structures and dynamics of two isomeric nitrosylruthenium complexes [Ru(OAc)(2mqn)2NO] (H2mqn = 2-methyl-8-quinolinol) in cis and trans isomeric configurations in a weak polar solvent (CDCl3). Using the NO stretching mode as a vibrational probe, information about local structural dynamics of the Ru complex as well as solvent fluctuation dynamics was obtained. In particular, a "structured" solvent environment is believed to form in the vicinity of the NO group in the case of the cis isomer with the aid of a neighboring OAc ligand, which is the reason for more efficient vibrational relaxation but more inhomogeneously distributed solvent and thus associated slower spectral diffusion. Our results also suggest a more anharmonic potential surface for the NO stretching mode in the less stable trans isomer.
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Affiliation(s)
- Pengyun Yu
- Beijing National Laboratory for Molecular Sciences, Molecular Reaction Dynamics Laboratory, Institute of Chemistry, the Chinese Academy of Sciences , Beijing, 100190, P. R. China.,University of Chinese Academy of Sciences , Beijing 100049, P. R. China
| | - Yan Zhao
- Beijing National Laboratory for Molecular Sciences, Molecular Reaction Dynamics Laboratory, Institute of Chemistry, the Chinese Academy of Sciences , Beijing, 100190, P. R. China.,Institute of Molecular Science, Shanxi University , Taiyuan, 030006, P. R. China
| | - Fan Yang
- Beijing National Laboratory for Molecular Sciences, Molecular Reaction Dynamics Laboratory, Institute of Chemistry, the Chinese Academy of Sciences , Beijing, 100190, P. R. China
| | - Huifen Pan
- Institute of Molecular Science, Shanxi University , Taiyuan, 030006, P. R. China
| | - Jianru Wang
- Institute of Molecular Science, Shanxi University , Taiyuan, 030006, P. R. China
| | - Juan Zhao
- Beijing National Laboratory for Molecular Sciences, Molecular Reaction Dynamics Laboratory, Institute of Chemistry, the Chinese Academy of Sciences , Beijing, 100190, P. R. China
| | - Wenming Wang
- Institute of Molecular Science, Shanxi University , Taiyuan, 030006, P. R. China
| | - Hongfei Wang
- Institute of Molecular Science, Shanxi University , Taiyuan, 030006, P. R. China
| | - Jianping Wang
- Beijing National Laboratory for Molecular Sciences, Molecular Reaction Dynamics Laboratory, Institute of Chemistry, the Chinese Academy of Sciences , Beijing, 100190, P. R. China.,University of Chinese Academy of Sciences , Beijing 100049, P. R. China
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