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Metallochromic / Complexometric Indicators

Beyond the Lab

GSP Chem's Innovative Leap

Chemochromic compounds, a fascinating subset of smart materials, have emerged as a promising frontier in scientific research and technological innovation. These compounds show a visual change in color as response to alterations in surrounding conditions like pH, humidity, CO2, O2. These compounds exhibit tunable optical properties in response to changes in ion concentration, making them versatile candidates for a wide range of applications, ushering in a new era of responsive and adaptive technologies. Their versatility and adaptability, opens up avenues for innovation across multiple domains and Industries and promises an exciting future. This unique property holds great promise for applications, some of which are mentioned below.

INDICATOR	METAL IONS	INDIVIDUAL COLORS	METALLIC COMPLEX
2,6-Dichloroindophenol Sodium Salt	Ascorbic Acid	Blue	Colorless
Alizarin Complexone	Ca, Mg, F, Ba, Ca, Cd, Co, Hg, In, Pb, Sr, Zn	Yellow Red	Red Blue
Aluminon	Ca, Mg, Al, Cu, La, In, Fe	Yellow-Orange	Red-Purple
Barium Diphenylamine Sulphonate	Redox Titration	Violet	Colorless
Bromopyrogallol Red	Bi	Red	Blue
Calcein (Fluorescein Complexone)	Ca, Mg	Orange	Yellowish Green
Calcon	Ca	Blue	Red
Calcon carboxylic acid	Ca in the presence of significant Mg	Blue	Red
Calmagite	Mn,Ca,Mg	Blue	Red
Eriochrome Black T	Al, Cd, Zn, Ca, Mg, Pb	Blue	Red
Eriochrome Blue Black B	Ca, Mg, Mn, Zn	Pink	Blue
Hydroxy Naphthol blue	Ca, Mg	Blue	Red
Methylthymol Blue Sodium Salt	Zn, Cu (II), Fe (II)	Grey – Blue	Blue
N,N-Diethyl-1,4-Phenylenediamine Sulfate	Cl	Colorless	Pink
Nitroso R salt	Co,Fe	Yellow	Red
o-Cresolphthalein Complexone	Ba, Ca, Sr, Ba	Colorless	Purple
PAN (1-(2-Pyridylazo)-2-naphthol)	Cu, Cd, Zn, Co, Sc, In	Blue -Green	Deep Blue
PAR ((4-(2-Pyridylazo)Resorcinol Monosodium Salt)	Cd,Co Ca,Cu,Ni,Bi,Sc	Yellow	pink
Pyrocatechol Violet	Bi, Cd, Co, In, Mn, Zn	Yellow	Blue
Pyrogallol Red	Mo	Red	Blue
Sodium Diphenylamine Sulphonate	Redox Titration	Violet	Colorless
SPADNS	Zr, F	Bright Red	Dark Red/ Colorless
Thymolphthalein Complexone	Ca, Mg	Colorless	Blue
Xylenol Orange Tetrasodium salt	Al, Bi, La, Sc, Th, Zr, Zn	Yellow	Red

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