Soft-Landing of CoIII(salen)+ and MnIII(salen)+ on Self-Assembled Monolayer Surfaces

Journal Article · Thu Mar 25 04:00:00 EDT 2010 · Journal of Physical Chemistry C, 114(12):5305-5311

DOI:https://doi.org/10.1021/jp904384q· OSTI ID:974924

Laskin, Julia; Wang, Peng; Hadjar, Omar

Soft-landing of mass-selected CoIII(salen)+ and MnIII(salen)+ complexes was performed using self-assembled monolayer surfaces of alkanethiol (HSAM) and fluorinated alkanethiol (FSAM) on gold as targets. Physical processes associated with ion deposition were studied using time-resolved in situ secondary ion mass spectrometry (SIMS) in a specially designed Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS). We demonstrate charge retention by a significant fraction of precursor ions on the FSAM and complete neutralization on the HSAM surface. Our results indicate efficient electron transfer from gold to the deposited species for the HSAM surface and inefficient, if any, electron transfer on the FSAM surface. Formation of abundant cluster ions observed in SIMS spectra is attributed to gas-phase reactions in the SIMS plume. Detailed analysis allowed us to extract the kinetics of both ionic and neutral complexes trapped on the FSAM surface. The results indicate that neutralization on this surface most likely takes place on the defect sites.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 974924
• Report Number(s): PNNL-SA-66322; 19594; 30445; KC0302020
• Journal Information: Journal of Physical Chemistry C, 114(12):5305-5311, Journal Name: Journal of Physical Chemistry C, 114(12):5305-5311 Journal Issue: 12 Vol. 114; ISSN 1932-7447
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
DEFECTS
DEPOSITION
ELECTRON TRANSFER
Environmental Molecular Sciences Laboratory
GOLD
ION CYCLOTRON-RESONANCE
Ion soft-landing
ion-surface collisions
metal-salen complex
self-assembled monolayers (SAMs)
FSAM
charge retention
neutralization
desorption CoIII(salen)+
MnIII(salen)+
KINETICS
MASS SPECTROMETERS
MASS SPECTROSCOPY
PRECURSOR
RETENTION
SPECTRA
TARGETS