US4871680A
Expired / Lapsed
US
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Process for the detection of molecular or ionic species
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1987-07-02
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Granted: 1989-10-03
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Expires: 2007-07-02
Abstract
Abstract A process and an apparatus for the detection of molecular or ionic species, comprising: (a) contacting a gaseous or liquid medium containing the species to be detected with a film comprising at least one monomolecular layer of amphiphilic compound chosen from among the tetracyanoquinodimethane (TCNQ) charge transfer complexes and the tetracyanoquinodimethane (TCNQ) salts, which conduct electricity or are precursors of electricity conducting charge transfer complexes and (b) determining the variation of one of the physical properties of the film. It is in particular possible to use layers of TCNQ alkyl-pyridinium, TCNQ alkyl-quinolinium, for detecting iodine, nitrogen oxides and fluoric compounds.
Inventors
- 👤 Andre Barraud
- 👤 Gisele Derost
- 👤 Laurence Henrion
- 👤 Annie Ruaudel-Teixier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:14
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/125; G01N27/126; Y; Y10; Y10T; Y10T436/00; Y10T436/16; Y10T436/17; Y10T436/177692; Y10T436/19
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
117 words
A process for the detection of molecular or ionic species present in a gaseous or liquid medium which comprises: (a) contacting said gaseous or liquid medium with a film comprising at least one monomolecular layer of an amphiphilic tetracyanoquinodimethane (TCNQ) compound selected from the group consisting of electrically conductive tetracyanoquinodimethane (TCNQ) charge transfer complexes, electrically conductive tetracyanoquinodimethane (TCNQ) salts, electrically insulating (TCNQ) charge transfer complexes capable of becoming electrically conductive by reaction with the molecular or ionic species to be detected, and electrically insulating (TCNQ) salts capable of becoming electrically conductive by reaction with the molecular or ionic species to be detected, and (b) measuring the change in electrical resistance of the film contacted with said medium.
Claim 2
Dependent Claim
117 words
A process for the detection of molecular or ionic species present in a gaseous or liquid medium which comprises: (a) contacting said gaseous or liquid medium with a film comprising at least one monomolecular layer of an amphiphilic tetracyanoquinodimethane (TCNQ) compound selected from the group consisting of electrically conductive tetracyanoquinodimethane (TCNQ) charge transfer complexes, electrically conductive tetracyanoquinodimethane (TCNQ) salts, electrically insulating (TCNQ) charge transfer complexes capable of becoming electrically conductive by reaction with the molecular or ionic species to be detected, and electrically insulating (TCNQ) salts capable of becoming electrically conductive by reaction with the molecular or ionic species to be detected, and (b) measuring the change in electrical resistance of the film contacted with said medium.
Claim 3
Dependent Claim
46 words
A process according to claim 1, wherein the film is formed from several monomolecular layers alternately constituted by a monomolecular layer of said amphiphilic (TCNQ) compound and a monomolecular layer of another amphiphilic compound selected from the group consisting of amphiphilic fatty acids and fatty alcohols.
Claim 4
Dependent Claim
34 words
A process according to claim 2, wherein the film is constituted by monomolecular layers formed alternately from a first compound constituted by a TCNQ alkyl-pyridinium iodide and a second compound constituted by behenic alcohol.
Claim 5
Dependent Claim
107 words
A process according to claim 1, wherein the amphiphilic (TCNQ) compound has the formula DA x X y , in which D represents an organic monomeric electron donor group, A represents 7,7,8,8-tetracyanoquinodimethane or 7,7,8,8-tetracyanoquinodimethane substituted by substituents selected from the group consisting of halogen atoms, alkyl radicals and alkoxy radicals, X represents a non-amphiphilic electron acceptor Lewis acid, x is number equal to 1 or exceeding 1 and y is equal to b 0 or is a number exceeding 0, at least one of the groups D and A being amphiphilic and having at least one alkyl, alkenyl or alkynyl substituent having at least 12 carbon atoms.
Claim 6
Dependent Claim
34 words
A process as in claim 4, wherein the film is constituted by monomolecular layers formed alternately from a first compound constituted by a TCNQ alkyl-pyridinium iodide and a second compound constituted by behenic alcohol.
Claim 7
Dependent Claim
31 words
A process according to claim 4, wherein said amphiphilic TCNQ compound is selected from the group consisting of TCNQ alkyl-ammonium, TCNQ alkyl-pyridinium, TCNQ alkyl-quinolinium, TCNQ alkyl-sulphonium, TCNQ alkyl-phosphonium and TCNQ alkyl-N-alkylisonicotinates.
Claim 8
Dependent Claim
43 words
A process according to claim 6, wherein the species to be detected is selected from the group consisting of iodine AsF 5 , BF 3 and PF 5 , nitrogen oxides of formula NO z , with z being between 1 and 3.
Claim 9
Dependent Claim
15 words
A process according to claim 4, wherein the TCNQ compound is a TCNQ alkyl-pyridinium iodide.
Claim 10
Dependent Claim
36 words
A process according to claim 8, wherein the species to be detected is selected from the group consisting of ammonia, a nitrogen oxide of formula NO z wherein z is between 1 and 3, and benzene.
Claim 11
Dependent Claim
116 words
A process for the detection of molecular or ionic species present in a gaseous or liquid medium which comprises: (a) contacting said gaseous or liquid medium with a film comprising at least one monomolecular layer of an amphiphilic tetracyanoquinodimethane (TCNQ) compound selected from the group consisting of electrically conductive tetracyanoquinodimethane (TCNQ) charge transfer complexes, electrically conductive tetracyanoquinodimethane (TCNQ) salts, electrically insulating (TCNQ) charge transfer complexes capable of becoming electrically conductive by reaction with the molecular or ionic species to be detected, and electrically insulating (TCNQ) salts capable of becoming electrically conductive by reaction with the molecular or ionic species to be detected, and (b) measuring the change optical absorption of the film contacted with said medium.
Claim 12
Dependent Claim
116 words
A process for the detection of molecular or ionic species present in a gaseous or liquid medium which comprises: (a) contacting said gaseous or liquid medium with a film comprising at least one monomolecular layer of an amphiphilic tetracyanoquinodimethane (TCNQ) compound selected from the group consisting of electrically conductive tetracyanoquinodimethane (TCNQ) charge transfer complexes, electrically conductive tetracyanoquinodimethane (TCNQ) salts, electrically insulating (TCNQ) charge transfer complexes capable of becoming electrically conductive by reaction with the molecular or ionic species to be detected, and electrically insulating (TCNQ) salts capable of becoming electrically conductive by reaction with the molecular or ionic species to be detected, and (b) measuring the change optical absorption of the film contacted with said medium.
Claim 13
Dependent Claim
46 words
A process according to claim 10, wherein the film is formed from several monomolecular layers alternately constituted by a monomolecular layer of said amphiphilic (TCNQ) compound and a monomolecular layer of another amphiphilic compound selected from the group consisting of amphiphilic fatty acids and fatty alcohols.
Claim 14
Dependent Claim
34 words
A process according to claim 11, wherein the film is constituted by monomolecular layers formed alternately from a first compound constituted by a TCNQ alkyl-pyridinium iodide and a second compound constituted by behenic alcohol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |