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Using a Disposable Pipet for Preparing Air-Sensitive Compounds for Melting Point Determinations or Storage

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Martial Sanz

Departamento de Química Inorgánica, Universidad de Alcalá, Edificio de Farmacia, Campus Universitario, Madrid, Spain

J. Chem. Educ., 2004, 81 (1), p 106

DOI: 10.1021/ed081p106

Publication Date (Web): January 1, 2004

Section:

General Physical Chemistry

Abstract

An inexpensive disposable Pasteur pipet can be transformed into a capillary tube, which, once correctly coupled with a Quickfit adapter with a side arm by means of a rubber septum, can receive under a dried and inert atmosphere air-sensitive samples from a Schlenk-type vessel. When the air-sensitive substance is placed at the bottom of the capillary tube, it is sealed under vacuum at the appropriate length. The capillary tube is then ready to be employed for melting point determination. This method can be also extended to the storage of air-sensitive compounds and proves to exceed those already described in the literature by its simplicity of construction and use, inexpensive cost, convenience, and reliability, requiring no grease to obtain a good vacuum.