title: Possible isomers in ligand protected Ag11 cluster ions identified by ion mobility mass spectrometry and fragmented by surface induced dissociation.
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.
authors: 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.
authors: Ananya
authors: A
authors: Baksi
authors: 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.
authors: Sophie R
authors: SR
authors: Harvey
authors: 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.
authors: Ganapati
authors: G
authors: Natarajan
authors: Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio, USA.
authors: Vicki H
authors: VH
authors: Wysocki
authors: 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.
authors: Thalappil
authors: T
authors: Pradeep