title: Differentiating Two Nitrosylruthenium Isomeric Complexes by Steady-State and Ultrafast Infrared Spectroscopies.
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.
authors.affiliation: 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.
authors.forename: Pengyun
authors.initials: P
authors.lastname: Yu
authors.affiliation: 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.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Molecular Reaction Dynamics Laboratory, Institute of Chemistry, the Chinese Academy of Sciences , Beijing, 100190, P. R. China.
authors.forename: Fan
authors.initials: F
authors.lastname: Yang
authors.affiliation: Institute of Molecular Science, Shanxi University , Taiyuan, 030006, P. R. China.
authors.forename: Huifen
authors.initials: H
authors.lastname: Pan
authors.affiliation: Institute of Molecular Science, Shanxi University , Taiyuan, 030006, P. R. China.
authors.forename: Jianru
authors.initials: J
authors.lastname: Wang
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Molecular Reaction Dynamics Laboratory, Institute of Chemistry, the Chinese Academy of Sciences , Beijing, 100190, P. R. China.
authors.forename: Juan
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Institute of Molecular Science, Shanxi University , Taiyuan, 030006, P. R. China.
authors.forename: Wenming
authors.initials: W
authors.lastname: Wang
authors.affiliation: Institute of Molecular Science, Shanxi University , Taiyuan, 030006, P. R. China.
authors.forename: Hongfei
authors.initials: H
authors.lastname: Wang
authors.affiliation: 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.
authors.forename: Jianping
authors.initials: J
authors.lastname: Wang