Thermal evaporation of intact positive ions of quaternary ammonium and phosphonium salts

Stoll, R.; Röllgen, F. W.

doi:10.1039/c39800000789

Cited by 43 publications

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“…The hypothesis that ions can be formed in a field‐independent thermal desorption process was initially proposed by Holland et al17 in connection with a model for ionization by field desorption (FD) and it was later unambiguously observed in the thermal evaporation of quaternary ammonium and phosphonium salts in vacuo by Stoll and Röllgen18 as well as by Cotter and Yergev 19. The present work, however, appears to represent the first case of thermal desorption of organic salts at atmospheric pressure.…”

mentioning

confidence: 58%

Dipolar Donor-Acceptor-Substituted Schiff Base Complexes with Large Off-Diagonal Second-Order Nonlinear Optical Tensor Components

Bella¹,

Fragalá²,

Ledoux³

et al. 2001

Chem. Eur. J.

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The synthesis, characterization, and two-dimensional second-order nonlinear optical (NLO) response of a dipolar NiII donor- acceptor Schiff base complex and the related ligand are reported. Electric-field-induced second-harmonic generation and harmonic light (hyper-Rayleigh) scattering techniques, in combination with INDO/SCI-SOS theoretical calculations, were used to investigate the vector part of the hyperpolarizability tensor and the two-dimensional character of the molecular nonlinearity, respectively. Off-diagonal hyperpolarizability tensors can be related to charge-transfer transitions that are polarized perpendicular to the molecular dipolar axis, while parallel transitions account for the diagonal hyperpolarizability tensor. The role of the metal center in enhancing the two-dimensional NLO response of such molecules is twofold since it acts both as the donor and the bridging moiety of the planar donor-(pi-conjugate-bridge)-acceptor system. These dipolar two-dimensional molecules are interesting candidates from the perspective of polarization-independent NLO materials.

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confidence: 58%

Dipolar Donor-Acceptor-Substituted Schiff Base Complexes with Large Off-Diagonal Second-Order Nonlinear Optical Tensor Components

Bella¹,

Fragalá²,

Ledoux³

et al. 2001

Chem. Eur. J.

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“…This has been shown conclusively to be a thermal evaporation of ions under vacuum for quaternary ammonium and phosphonium salts. 10 Chen et al 11 recently showed that some organic salts could be thermally desorbed as ions into the gas phase under ambient conditions, a process they termed atmospheric pressure thermal desorption ionization (APTDI).…”

Section: Thermal Desorption/ionizationmentioning

confidence: 99%

Established and emerging atmospheric pressure surface sampling/ionization techniques for mass spectrometry

2008

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The number and type of atmospheric pressure techniques suitable for sampling analytes from surfaces, forming ions from these analytes, and subsequently transporting these ions into vacuum for interrogation by MS have rapidly expanded over the last several years. Moreover, the literature in this area is complicated by an explosion in acronyms for these techniques, many of which provide no information relating to the chemical or physical processes involved. In this tutorial article, we sort this vast array of techniques into relatively few categories on the basis of the approaches used for surface sampling and ionization. For each technique, we explain, as best known, many of the underlying principles of operation, describe representative applications, and in some cases, discuss needed research or advancements and attempt to forecast their future analytical utility.

show abstract

“…The hypothesis that ions can be formed in a fieldindependent thermal desorption process was initially proposed by Holland et al [17] in connection with a model for ionization by field desorption (FD) and it was later unambiguously observed in the thermal evaporation of quaternary ammonium and phosphonium salts in vacuo by Stoll and Röllgen [18] as well as by Cotter and Yergev. [19] The present work, however, appears to represent the first case of thermal desorption of organic salts at atmospheric pressure.…”

mentioning

confidence: 98%

Thermal Production and Reactions of Organic Ions at Atmospheric Pressure

2006

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Thermal evaporation of intact positive ions of quaternary ammonium and phosphonium salts

Abstract: Evidence is presented for a purely thermal evaporation of intact positive ions of quaternary ammonium and phosphonium salts.

Cited by 43 publications

References 0 publications

Dipolar Donor-Acceptor-Substituted Schiff Base Complexes with Large Off-Diagonal Second-Order Nonlinear Optical Tensor Components

Dipolar Donor-Acceptor-Substituted Schiff Base Complexes with Large Off-Diagonal Second-Order Nonlinear Optical Tensor Components

Established and emerging atmospheric pressure surface sampling/ionization techniques for mass spectrometry

Thermal Production and Reactions of Organic Ions at Atmospheric Pressure

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