Determination of Melting Point of Transition Metal Complexes with Bis-(macro-cyclic) Ligands by Open Capillary Method (CAT#: STEM-PPA-0102-YJL)

Name: Determination of Melting Point of Transition Metal Complexes with Bis-(macro-cyclic) Ligands by Open Capillary Method
SKU: STEM-PPA-0102-YJL
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Introduction

The vast family of macrocyclic ligands and their complexes has now been established as an integral part of coordination chemistry. The preference for macrocylic ligand over unidentate and bidentate ligands has arisen from being close to the biological system, the greater stability and inertness of their complexes and often the extreme physical properties in their complexes due to strong ligand field.

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Principle Applications Procedure Materials

Principle

Melting point is a characteristic property of solid crystalline substance. It is the temperature at which the solid phase changes to the liquid phase. This phenomenon occurs when the substance is heated.
In all major pharmacopoeias the open capillary method is described to determine the melting point (slip point) for fats, fatty acids, paraffin, and waxes. In a glass capillary tube open at both ends (1), 10 mm of sample is introduced (2), chilled to a given temperature and immersed into a water bath (3/4). The melting point with open capillary, also known as slip point or slip melting point, is the temperature at which the substance begins to rise in the capillary due to the effect of the increasing temperature and buoyancy.

Applications

Chemical industry; Cosmetic/pharmaceutical industry

Procedure

1. Prepare the substance.
2. Affix one of the capillaries to a thermometer.
3. Place the thermometer with an affixed capillary into a glass.
4. Increase the temperature.