The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 1998
Filed:
Jul. 25, 1996
Kent R Mann, North Oaks, MN (US);
Charles A Daws, Minneapolis, MN (US);
Christopher L Exstrom, Kearney, NE (US);
Daron E Janzen, Minneapolis, MN (US);
Marie Pomije, Apple Valley, MN (US);
Regents of The University of Minnesota, Minneapolis, MN (US);
Abstract
The present invention relates to a process for indicating the presence of organic vapors comprising the steps of determining the color, absorption or emission spectra of a Pt--Pt double-complex salt of platinum or a neutral platinum complex in the absence of organic vapor, exposing said double-complex salt of platinum or a neutral platinum complex to a gaseous environment, determining the color, absorption or emission spectra of said double-complex salt of platinum or a neutral platinum complex after exposure to said gaseous environment, and comparing the color, absorption and/or emission spectra of said double-complex salt of platinum or a neutral platinum complex in the absence of organic vapor with the color, absorption and/or emission spectra of said double-complex salt of platinum or a neutral platinum complex after exposure to said gaseous environment to determine if there is a difference in the color, absorption and/or emission spectra. The double-complex salt is represented by the general formulas �Pt(CN--C.sub.6 H.sub.4 -alkyl group).sub.4 !�PtX.sub.4 ! or �Pt(phen)(CN--C.sub.6 H.sub.4 -alkyl group).sub.2 !�PtX.sub.4 ! of �Pt(bpy)(CN--C.sub.6 H.sub.4 -alkyl group).sub.2 !�PtX.sub.4 ! and more preferably by the formulas �Pt(CN--C.sub.6 H.sub.4 --C.sub.n H.sub.2n+1).sub.4 !�Pt(CN).sub.4 ! or �Pt(phen)(CN--C.sub.6 H.sub.4 -alkyl group).sub.2 !�Pt(CN).sub.4 ! of �Pt(bpy)(CN--C.sub.6 H.sub.4 -alkyl group).sub.2 !�Pt(CN).sub.4 !, wherein n is a whole positive integer between 1 and 100. Still more preferably n is between 1 and 20. phen is 1,10-phenanthroline or an alkyl substituted phenanthroline, bpy is 2,2'-bipyridine or an alkyl substituted bipyridine. Other bidentate or tridentate amine ligands are also possible. The PtX.sub.4.sup.2- group can also be Pt(NO.sub.2).sub.4.sup.2-, Pt(Cl).sub.4.sup.2-, Pt(Br).sub.4.sup.2-, Pt(NCO).sub.4.sup.2-, Pt(NCS).sub.4.sup.2- or Pt(oxalate).sub.2.sup.2-. For the bpy and phen complexes, the palladium analogs of PtX.sub.4.sup.2- (ie. PdX.sub.4.sup.2- are also possible). The neutral complexes are represented by the general formulas Pt(CN--C.sub.6 H.sub.4 -alkyl group).sub.2 X.sub.2, and Pt(CN--C.sub.6 H.sub.4 -alkyl group)(C(Y).dbd.NH--C.sub.6 H.sub.4 -alkyl group)X.sub.2 wherein n is a whole positive integer between 1 and 100 and Y can be O-alkyl, NH-alkyl or N(alkyl).sub.2. Still more preferably n is between 1 and 20. The alkyl substituents may be different within the same complex. X is preferably CN.sup.-, but any other negatively charged groups such as NO.sub.2.sup.-, NCO.sup.-, NCS.sup.-, Cl.sup.-, Br.sup.-, I.sup.-, oxalate, etc. may also be used. The two X.sup.- groups are not necessarily the same.