Classification

Metal Chelates

Introduction

Organic compounds that coordinate metal ions into circular structures (chelate circles) are called chelating reagents. Most chelating reagents include oxygen, nitrogen, or sulfur atoms in their molecules. Chelate structures with five or six member rings form the most stable chelate circle. In chelating reactions of typical chelating reagents, such as ethylenediamine, acetylacetone, and oxine, several molecules are coordinated with one metal ion. Ethylenediamine tetraacetic acid (EDTA), which has many coordinated atoms, forms a very stable chelate between one molecule of EDTA and metal ion. Chelating reagents are used for chelate titration, isolation, and separation of metal ions. They are also used to mask certain ions, to solubilize metals in organic solvents, and for gas chromatography of metal ions. Metal indicators are chelating reagents that can be used to colorimetrically or fluorometrically determine metal ion concentration in solutions. Acetylacetone (AA) and its analogs are used for solvent extractions of metal ions from aqueous solutions. These metal complexes are used as catalysts of polymerization, dryness, and combustion. Chelating reagents, including EDTA, EDTA analogs, metal salts, and others, are available in bulk quantities from Dojindo. The following table indicates the stability constants of chelators with various metal ions and chelate reagents.

 

Product

EDTA
Code Product name Unit size
E005 Metal Chelate
EDTA-OH
5 g
25 g
E008 Metal Chelate
Ca(II)-EDTA
50 g
E010 Metal Chelate
Cu(II)-EDTA
10 g
E011 Metal Chelate
Fe(III)-EDTA
50 g
500 g
E013 Metal Chelate
Mg(II)-EDTA
25 g
E017 Metal Chelate
Zn(II)-EDTA
25 g
500 g
G002 Metal Chelate
GEDTA(EGTA)
100 g
H001 Metal Chelate
4H(EDTA・free acid)
500 g
K001 Metal Chelate
2K(EDTA・2K)
50 g
500 g
K002 Metal Chelate
3K(EDTA・3K)
50 g
500 g
N001 Metal Chelate
2NA(EDTA・2Na)
500 g
N002 Metal Chelate
3NA(EDTA・3Na)
500 g
N003 Metal Chelate
4NA(EDTA・4Na)
500 g
N008 Metal Chelate
2NH4(EDTA・2NH4)
500 g
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Other Chelator
Code Product name Unit size
B019 Metal Chelate
BAPTA
500 mg
C018 Metal Chelate
CyDTA
25 g
D022 Metal Chelate
DTPA
5 g
25 g
GB04 Good's Buffer
Bicine
25 g
100 g
H006 Metal Chelate
HIDA
5 g
I001 Metal Chelate
IDA
25 g
500 g
N030 Metal Chelate
NTPO
5 g
T031 Metal Chelate
TTHA
5 g
T040 Intracellular Fluorescent Probes
TPEN
100 mg
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Reagents for Chelator Titration
Code Product name Unit size
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Product Classification

Product Classification