Vapour pressure of some phthalocyanines

2000 ◽  
Vol 04 (03) ◽  
pp. 271-277 ◽  
Author(s):  
P. P. SEMYANNIKOV ◽  
T. V. BASOVA ◽  
V. M. GRANKIN ◽  
I. K. IGUMENOV
Keyword(s):  
Thermal Decomposition ◽  
Thermodynamic Parameters ◽  
Gaseous Phase ◽  
Vapour Pressure ◽  
Mass Spectrometric ◽  
Knudsen Effusion ◽  
Sublimation Process ◽  
Solid Compounds ◽  
Knudsen Effusion Method ◽  
Effusion Method

Mass spectrometric studies of the composition of the gaseous phase under solid compounds of free phthalocyanine ( H 2 Pc ) and its complexes with aluminium ( AlClPc , AlFPc , ( AlPc )2 O ) and copper ( CuPc ) were performed in the temperature range up to 700 °C. It has been shown that the phthalocyanines sublime in the form of monomers, excluding one aluminium complex. All phthalocyanines under investigation sublime without thermal decomposition until 700 °C. The vapour pressure of these phthalocyanines was determined as a function of temperature by the Knudsen effusion method, in which the rate of effusion of the equilibrium vapour through a small orifice was measured. The thermodynamic parameters of the sublimation process for phthalocyanies were calculated.

Vapor pressure measurements and thermodynamics of some volatile phthalocyanines

2006 ◽  
Vol 10 (08) ◽  
pp. 1034-1039 ◽  
Author(s):  
Petr Semyannikov ◽  
Tamara Basova ◽  
Sergei Trubin ◽  
Evgeny Kol'tsov ◽  
Igor Igumenov
Keyword(s):  
Thermal Decomposition ◽  
Vapor Pressure ◽  
Gaseous Phase ◽  
Mass Spectrometric ◽  
Pressure Measurements ◽  
Knudsen Effusion ◽  
Solid Compounds ◽  
Knudsen Effusion Method ◽  
Vapor Pressure Measurements ◽  
Effusion Method

Mass spectrometric studies of the composition of the gaseous phase for solid compounds of hexadecafluorinated phthalocyanines MPcF 16, M = Cu , Zn , VO and their unsubstituted MPc analogs were performed in a temperature range up to 600°C. It has been shown that phthalocyanines sublime into the form of monomers without thermal decomposition. The vapor pressure of these phthalocyanines was determined as a function of temperature by the Knudsen effusion method, in which the rate of effusion of the equilibrium vapor through a small orifice was measured. The thermodynamic parameters of the sublimation process for phthalocyanines were calculated.

The vapour pressure of solid cadmium

1955 ◽  
Vol 8 (4) ◽  
pp. 485 ◽  
Author(s):  
TA O'Donnell
Keyword(s):  
Vapour Pressure ◽  
Reliable Determination ◽  
Knudsen Effusion ◽  
Temperature Range ◽  
Knudsen Effusion Method ◽  
Effusion Method

An apparatus has been designed for measurement by the Knudsen effusion method of the vapour pressure of solid cadmium in the temperature range 200-260 �C. Reliability of the apparatus was checked by measurement of the vapour pressure of zinc, for which a recent, reliable determination has been reported. The vapour pressure of cadmium in the temperature range studied is given by the equation log10 Pmm = 9.413 ? 6078/T .

Activity of zinc in the liquid Bi-In-Sn-Zn alloys determined by knudsen method

2012 ◽  
Vol 57 (3) ◽  
pp. 837-843
Author(s):  
A. Zajaczkowski ◽  
W. Gasior ◽  
B. Onderka
Keyword(s):  
Liquid Phase ◽  
Mass Loss ◽  
Vapour Pressure ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Positive Deviation ◽  
Knudsen Effusion ◽  
Knudsen Effusion Method ◽  
Effusion Method ◽  
Zn Alloys

The Knudsen effusion method was used for measurements of mass loss rate of liquid Bi-In-Sn-Zn alloys, in the temperature range from 572 to 768 K. The studies were carried out for the alloys with the ratio of Bi:In:Sn equal 2:6:2, 2:2:6 and 8:1:1. The obtained results were used for the calculation of zinc vapour pressure over liquid Bi-In-Sn-Zn alloys and next the activity of zinc in the Bi-In-Sn-Zn liquid phase. It was found that for the investigated alloys the activity of zinc shows the considerable positive deviation from the Raoult’s law.

Dissociation Energy of the SbPb Moleculc from Mass Spectrometric High Temperature Studies

1981 ◽  
Vol 36 (8) ◽  
pp. 913-916 ◽  
Author(s):  
K. F. Zmbov ◽  
A. Neubert ◽  
H. R. Ihle
Keyword(s):  
High Temperature ◽  
Dissociation Energy ◽  
Diatomic Molecules ◽  
Mass Spectrometric ◽  
Group V ◽  
Knudsen Effusion ◽  
Knudsen Effusion Method ◽  
Effusion Method

Abstract The observation of the gaseous BiPb molecule [1,2] suggests the existence of heteronuclear diatomic molecules of lead with the group V-b elements. The present paper reports on the identification of the SbPb(g) molecule and the determination of its dissociation energy by mass spectrometric Knudsen-effusion method.

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