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Crystal Structure of Potassium Croconate Dihydrate, after 175 Years
Author(s) -
Dunitz Jack D.,
Seiler Paul,
Czechtizky Werngard
Publication year - 2001
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/1521-3773(20010504)40:9<1779::aid-anie17790>3.0.co;2-6
Subject(s) - crystal structure , potassium , ionic bonding , ion , crystallography , molecule , chemistry , crystal (programming language) , materials science , inorganic chemistry , organic chemistry , computer science , programming language
Stacks of croconate dianions separated by K + ions and H 2 O molecules: the crystal structure of potassium croconate dihydrate, K 2 (C 5 O 5 )⋅2 H 2 O, isolated and described by Leopold Gmelin more than 170 years ago, has now been established by X‐ray analysis (see picture). Since the anions have a formal charge of −2 and an interplanar separation of only 3.30 Å, the structure is not easily explained in terms of a simple ionic model.