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Title: Structural Motifs of [Fe(CO 2 ) n ] − Clusters ( n = 3–7)
Award ID(s):
1734006
PAR ID:
10057138
Author(s) / Creator(s):
; ;
Date Published:
Journal Name:
The Journal of Physical Chemistry A
Volume:
121
Issue:
21
ISSN:
1089-5639
Page Range / eLocation ID:
4132 to 4138
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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  1. The vibrational structure and binding motifs of vanadium cation-ethane clusters, V(+)(C2H6)n, for n = 1 – 4 are probed using infrared photodissociation spectroscopy in the C-H stretching region (2550 – 3100 cm-1). Comparison of spectra to scaled harmonic frequency spectra obtained using density functional theory suggest that ethane exhibits two primary binding motifs when interacting with the vanadium cation, an end-on 𝜂2 configuration and a side-on configuration. The lower-energy side-on configuration predominates in smaller clusters, but the end-on configuration becomes important for larger clusters as it helps to maintain a roughly square planar geometry about the central vanadium. Proximate C-H bonds exhibit elongation and large red-shifts when compared to bare ethane, particularly in the case of the side-on isomer, which are underestimated by scaled harmonic frequency calculations, demonstrating initial effects of C-H bond activation. 
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