Sequesterant

LNC SEQUESTERING AGENTS Sequestration may be defined as the ability of a compound to form a complex with a metal ion, keeping it in solution despite the presence of precipitating agent. Before dealing with the problem of sequestering agents, it is... More

LNC SEQUESTERING AGENTS Sequestration may be defined as the ability of a compound to form a complex with a metal ion, keeping it in solution despite the presence of precipitating agent. Before dealing with the problem of sequestering agents, it is advisable to check through a few notions of general chemistry. Co-ordination compounds or complexes are those species where a central atom is surrounded by a group of atoms or small external molecules which go under the name of ligand. The formation of complex is due to an acid base reaction according to Lewis. The central atom (usually a metal ion) acts as an electron acceptor, the ligand acts as donors. A ligand may be uni-dentate or multi-dentate, the former case includes monoatomic ions (e. g. cl-) and all those molecules that have one single atom with an electronic doublet available for coordination (e. g. H2O: and :NH3) and the latter case includes those molecules which have several atoms with one free lone paid e. g. ethylenedi Less