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Polymorphism in crystalline formic acid

✍ Scribed by H.R. Zelsmann; F. Bellon; Y. Marechal; B. Bullemer

Publisher
Elsevier Science
Year
1970
Tongue
English
Weight
298 KB
Volume
6
Category
Article
ISSN
0009-2614

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✦ Synopsis

Crystalline formic acid has been investigated by IR-spectroscopy and differential thermal tiyEiS from 78% to 300%. A first-order phase transition. showing hystefesis between 2070K and 218w has been observed, and tentative assigknents are given: 1. INTRODUCTION During our systematic studies of proton dynamics in hydrogen-bonded crystals by IR-spectroscopy we have investigated the polymorphic forms of formic acid. This polymorphism has been postulated by Mikawa et al. [l] on the basis of II&spectroscopy at high pressures. These authors deduced t-hat crystalline formic acid may exist in two different forms, named Q and B-

In order to interpret our experimental spec-

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Polymorphism in Crystalline Cinchomeroni
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✍ Dario Braga; Lucia Maini; Concezio Fagnano; Paola Taddei; Micheleβ€…R. Chierotti; πŸ“‚ Article πŸ“… 2007 πŸ› John Wiley and Sons 🌐 English βš– 515 KB

## Abstract The structural relationship between the two crystal forms of cinchomeronic acid (**CA** 3,4‐dicarboxypyridine) has been investigated by single crystal X‐ray diffraction, IR and Raman spectroscopy and solid state NMR spectroscopy, showing that the two polymorphs form a monotropic system,