Possible isomers in ligand protected Ag11 cluster ions identified by ion mobility mass spectrometry and fragmented by surface induced dissociation

Ananya Baksi; Sophie R Harvey; Ganapati Natarajan; Vicki H Wysocki; Thalappil Pradeep

doi:10.1039/c5cc09119e

Possible isomers in ligand protected Ag11 cluster ions identified by ion mobility mass spectrometry and fragmented by surface induced dissociation

Chem Commun (Camb). 2016 Mar 7;52(19):3805-8. doi: 10.1039/c5cc09119e.

Authors

Ananya Baksi¹, Sophie R Harvey², Ganapati Natarajan¹, Vicki H Wysocki³, Thalappil Pradeep¹

Affiliations

¹ DST Unit of Nanoscience (DST UNS), and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras, Chennai - 600 036, India. pradeep@iitm.ac.in.
² Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio, USA and School of Chemistry, Manchester Institute of Biotechnology, University of Manchester, Manchester, M1 7DN, UK.
³ Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio, USA.

PMID: 26864967
DOI: 10.1039/c5cc09119e

Abstract

This communication reports the identification of gas phase isomers in monolayer-protected silver clusters. Two different isomers of Ag11(SG)7(-) (SG-gulathione thiolate) with different drift times have been detected using combined electrospray ionization (ESI) and ion mobility (IM) mass spectrometry (MS). Surface induced dissociation (SID) of the 3(-) charge state of such clusters shows charge stripping to give the 1(-) charged ion with some sodium attachment, in addition to fragmentation. SID and collision induced dissociation (CID) for Ag11(SG)7(-) suggest different pathways being accessed with each method. SID was introduced for the first time for the study of monolayer-protected clusters.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.