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Synthesis 2002(11): 1530-1540
DOI: 10.1055/s-2002-33333
PAPER
© Georg Thieme Verlag Stuttgart · New York

Polycations-12. The Synthesis of Liquid Ionic Phosphates (LIPs) from
Mono- and Polycationic Ammonium Halides

Sharon Lalla, Valbona Behaja, Danny Manchenoa, Robert Casianoa, Marie Thomasa, Amir Rikina, Jennifer Gaillarda, Ravinder Rajua, Alexander Scumpiaa, Steve Castroa, Robert Engel*a, JaimeLee Iolani Cohen*b
Department of Chemistry and Biochemistry, Queens College, CUNY, 65-30 Kissena Boulevard, Flushing, NY 11367, USA
Fax: +1(718)9975198; e-Mail: robert_engel@qc.edu ;
Department of Chemistry and Physical Sciences, Pace University, 1 Pace Plaza, New York, NY 10038, USA
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Publication History

Received 19 February 2002
Publication Date:
23 August 2002 (online)

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Abstract

Preparations are reported for an extensive series of phosphate salts of polyammonium species from the corresponding halide salts. The phosphate salts, as anhydrous materials, are liquid at or near room temperature. Three approaches for the preparation of these materials are noted, including treatment with aqueous hexafluorophosphoric acid, classical ion exchange methods, and treatment with 85% phosphoric acid. The last of these provides the most desirable results. Several monocationic phosphate salts have also been prepared for comparison with other types of ionic liquids.

Key words

ionic liquid - ammonium - phosphate - molten salt