A multisensor array for detection of an analyte or mixtures thereof in the gas phase, comprising at least two different chemo-selective compounds represented by the general formulas 1) and 2) immobilized on a solid support spatially separated and individually addressable wherein X 1, X 2, X 3, and X 4 each independently represents a hetero atom selected from sulfur and selenium; and wherein the substituents R 1 -R 4 of general formula 1) are R 1 is a substituent selected from hydrogen; halogen; C 1 -C 4 -alkyl; C 1 -C 20 -alkylsulfanyl; 2-substituted ethylsulfanyl wherein the substituents are selected from the group of carboxamide, cyano, hydroxy, amino, (N-benzoyl)amino, halogen, methylthio, phenylcarboxy, and phenoxycarbonyl; 2-(methylthio)ethylsulfanyl copper bromide; benzoylsulfanyl; methoxycarbonyl; cyano; carboxy; phenyl; benzyl; phenyl para-substituted by methoxy or halogen; and (4'-{[7-(2-cyanoethylthio)-2,3-dimethoxy-carbonyl-6-thio-methylene]tetrathiafulvalene}-4-bipyridine)methylsulfanyl; R 2 is a substituent selected from hydrogen; halogen; C 1 -C 4 -alkyl; C 1 -C 20 -alkylsulfanyl; 2-substituted ethylsulfanyl wherein the substituents are selected from the group of cyano, hydroxy, amino, (N-benzoyl)amino, halogen, methylthio, phenylcarboxy, phenoxycarbonyl, and (4-nitrophenyl); benzoylsulfanyl; cyano; carboxy; methoxycarbonyl; phenyl; benzyl; and phenyl para-substituted by methoxy or halogen; R 3 is a substituent selected from hydrogen; halogen; C 1 -C 4 -alkyl; C 1 -C 20 -alkylsulfanyl; 2-substituted ethylsulfanyl wherein the substituents are selected from the group of cyano, hydroxy, amino, (N-benzoyl)amino, halogen, methylthio, phenylcarboxy, phenoxycarbonyl, and (4-nitrophenyl); benzoylsulfanyl; methoxycarbonyl; cyano; carboxy; un-substituted phenyl and phenyl para-substituted by halogen; R 4 is a substituent selected from hydrogen; halogen; C 1 -C 4 -alkyl; C 1 -C 20 -alkylsulfanyl; 2-substituted ethylsulfanyl wherein the substituents are selected from the group of cyano, carboxamide, hydroxy, amino, (N-benzoyl)amino, halogen, methylthio, phenylcarboxy, phenoxycarbonyl; benzoylsulfanyl; benzyl; methoxycarbonyl; cyano; and carboxy; or R 1 and R 4 together form a group selected from R 2 and R 3 together form a group selected from: and wherein the substituents R 1 -R 4 of general formula 2) are R 2 is a substituent selected from methoxycarbonyl; C 1 -C 20 -alkylsulfanyl; and 2-substituted ethylsulfanyl wherein the substituents are selected from the group of 4-nitrophenyl and 2-(2-methoxyethoxy)ethoxy; R 3 is a substituent selected from C 1 -C 20 -alkylsulfanyl; 2-substituted ethylsulfanyl wherein the substituents are selected from the group of 4-nitrophenyl and 2-(2-methoxyethoxy)-ethoxy; and methoxycarbonyl; R 1 and R 4 together form a group selected from: and and the at least two compounds have a molecular weight below 1700. R 1 is a substituent selected from hydrogen; halogen; C 1 -C 4 -alkyl; C 1 -C 20 -alkylsulfanyl; 2-substituted ethylsulfanyl wherein the substituents are selected from the group of carboxamide, cyano, hydroxy, amino, (N-benzoyl)amino, halogen, methylthio, phenylcarboxy, and phenoxycarbonyl; 2-(methylthio)ethylsulfanyl copper bromide; benzoylsulfanyl; methoxycarbonyl; cyano; carboxy; phenyl; benzyl; phenyl para-substituted by methoxy or halogen; and (4'-{[7-(2-cyanoethylthio)-2,3-dimethoxy-carbonyl-6-thio-methylene]tetrathiafulvalene}-4-bipyridine)methylsulfanyl; R 2 is a substituent selected from hydrogen; halogen; C 1 -C 4 -alkyl; C 1 -C 20 -alkylsulfanyl; 2-substituted ethylsulfanyl wherein the substituents are selected from the group of cyano, hydroxy, amino, (N-benzoyl)amino, halogen, methylthio, phenylcarboxy, phenoxycarbonyl, and (4-nitrophenyl); benzoylsulfanyl; cyano; carboxy; methoxycarbonyl; phenyl; benzyl; and phenyl para-substituted by methoxy or halogen; R 3 is a substituent selected from hydrogen; halogen; C 1 -C 4 -alkyl; C 1 -C 20 -alkylsulfanyl; 2-substituted ethylsulfanyl wherein the substituents are selected from the group of cyano, hydroxy, amino, (N-benzoyl)amino, halogen, methylthio, phenylcarboxy, phenoxycarbonyl, and (4-nitrophenyl); benzoylsulfanyl; methoxycarbonyl; cyano; carboxy; un-substituted phenyl and phenyl para-substituted by halogen; R 4 is a substituent selected from hydrogen; halogen; C 1 -C 4 -alkyl; C 1 -C 20 -alkylsulfanyl; 2-substituted ethylsulfanyl wherein the substituents are selected from the group of cyano, carboxamide, hydroxy, amino, (N-benzoyl)amino, halogen, methylthio, phenylcarboxy, phenoxycarbonyl; benzoylsulfanyl; benzyl; methoxycarbonyl; cyano; and carboxy; or R 1 and R 4 together form a group selected from R 2 and R 3 together form a group selected from: and R 2 is a substituent selected from methoxycarbonyl; C 1 -C 20 -alkylsulfanyl; and 2-substituted ethylsulfanyl wherein the substituents are selected from the group of 4-nitrophenyl and 2-(2-methoxyethoxy)ethoxy; R 3 is a substituent selected from C 1 -C 20 -alkylsulfanyl; 2-substituted ethylsulfanyl wherein the substituents are selected from the group of 4-nitrophenyl and 2-(2-methoxyethoxy)-ethoxy; and methoxycarbonyl; R 1 and R 4 together form a group selected from: and