Aggregation of homologous alkyltrimethylammonium thiocyanates and chlorides in chloroform

Czapkiewicz, Jan; Maciejowska, Iwona

doi:10.1016/0166-6622(92)80254-y

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…According to the identifiability study in section 2.1, the knowledge of kol, k o 2 , and ko3 allows one to specify limits on k21, k31, k12, k32 (eqs [30][31][32][33]. If one of these four rate constants is kept constant at a certain preset value, the system becomes identifiable.…”

Section: Time-resolved Measurementsmentioning

confidence: 98%

Global tricompartmental analysis of the fluorescence decay surface of the charged fluorescent probe N,N,N-trimethyl-3-(1-pyrenyl)-1-propanaminium prchlorate

Hermans¹,

Schryver²,

Boens³

et al. 1994

J. Phys. Chem.

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The kinetics of the excited-state processes of the charged fluorescent probe N,N,N-trimethyl-3-( l-pyreny1)-1 -propanaminium perchlorate (PROBE) in tetrahydrofuran are reported. At very low concentrations PROBE decays monoexponentially with a lifetime z of 236 f 1 ns, from which b 1 = l/z = 4.2 x lo6 s-l is obtained. Upon addition of the quaternary ammonium salt N,N,N-trimethyl-l -dodecanaminium perchlorate a biexponential decay function is needed to describe the decay traces. The second excited state is the aggregated PROBE. This aggregation is due to dipole-dipole or ion-dipole interactions. The rate constant values of the kinetic Scheme (Scheme 4) are obtained by global bicompartmental analysis: bl = b 2 , kzl = (42 f 7) x lo9 M-' s-l; k12 = (5.7 f 0.1) x lo7 s-l. When the concentration of PROBE itself is varied, a triple-exponential decay function adequately describes the decay surface. The third excited-state species is a PROBE excimer, which can be formed through two different pathways: either intermolecularly when a locally excited PROBE molecule encounters a ground-state PROBE molecule or intramolecularly when an aggregate of two PROBE molecules rearranges. To resolve the kinetics of this system, global tricompartmental analysis is developed.Even after including the information available from experiments where NJV,N-trimethyl-1 -dodecanaminium perchlorate is added (bl = b2), and the information available from the global triple-exponential analysis (k13 = 0 and k23 = 0) (Scheme 5), the experimental time-resolved data do not allow one to obtain a unique solution for the rate constant values. By scanning the rate constant k31, bounds can be specified for the rate constants: 53 x lo9 < k21 < 60 x lo9 M-' s-l, k31 < 7 x lo9 M-' s-l, 1.5 x lo8 < k12 < 1.7 x lo8 s-l, and k32 < 2 x lo7 s-'. Unique values are obtained for b l , b2, and b 3 : bl = b 2 = (4.25 f 0.01) x lo7 s-l; b3 = (1.92 f 0.03) x lo7 s-l.

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Section: Time-resolved Measurementsmentioning

confidence: 98%

Global tricompartmental analysis of the fluorescence decay surface of the charged fluorescent probe N,N,N-trimethyl-3-(1-pyrenyl)-1-propanaminium prchlorate

Hermans¹,

Schryver²,

Boens³

et al. 1994

J. Phys. Chem.

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“…After substitution, catalytically active Pd (II) aggregates are suspended in the solution. The formation mechanism of Pd (II) aggregates is unclear, but the imidazolium salts are assumed to stabilize the nano‐sized aggregates, analogous to the stabilization of metal nanoparticles by tetraalkylammonium salts …”

Section: Introductionmentioning

confidence: 99%

Template‐free anion‐controlled synthesis of Pd (II) nano‐aggregates for the antifouling polymerization of CO and ethylene

Lim

Chae

Yim

et al. 2019

Applied Organom Chemis

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The reaction of [(domppp) Pd (OAc)2] [domppp = 1,3‐bis (di‐o‐methoxyphenylphosphino)propane] and imidazolium‐functionalized carboxylic acids containing various anions (Br−, PF6−, SbF6− and BF4−) resulted in the formation of nano‐sized Pd (II) aggregates under template‐free conditions. The rate of formation of aggregates can be modulated by changing the anion, affecting the rate of polymerization of CO and olefins without fouling. Herein, we describe the analysis of Pd (II) catalysts by dynamic light scattering, atomic force microscopy, X‐ray photoelectron spectroscopy and X‐ray crystallography, and co‐ and terpolymerization results including the catalytic activity, and bulk density and molecular weight of polymers.

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Aggregation of homologous n-alkylpyridinium halides and of methylcollidinium bromide in chloroform

Czapkiewicz

1992

Colloids and Surfaces

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Aggregation of homologous alkyltrimethylammonium thiocyanates and chlorides in chloroform

Cited by 3 publications

References 7 publications

Global tricompartmental analysis of the fluorescence decay surface of the charged fluorescent probe N,N,N-trimethyl-3-(1-pyrenyl)-1-propanaminium prchlorate

Global tricompartmental analysis of the fluorescence decay surface of the charged fluorescent probe N,N,N-trimethyl-3-(1-pyrenyl)-1-propanaminium prchlorate

Template‐free anion‐controlled synthesis of Pd (II) nano‐aggregates for the antifouling polymerization of CO and ethylene

Aggregation of homologous n-alkylpyridinium halides and of methylcollidinium bromide in chloroform

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