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Topological Study of Pseudo‐Cubic Hydrogen‐Bond Networks in a Binary System Composed of Primary Ammonium Carboxylates: An Analogue of an Ice Cube
Author(s) -
Yuge Tetsuharu,
Tohnai Norimitsu,
Fukuda Takeyoshi,
Hisaki Ichiro,
Miyata Mikiji
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200700099
Subject(s) - hydrogen bond , cube (algebra) , carboxylate , crystallography , topology (electrical circuits) , crystal structure , ammonium , binary number , crystal (programming language) , chemistry , materials science , computer science , combinatorics , mathematics , stereochemistry , molecule , organic chemistry , arithmetic , programming language
Hierarchical classification and single‐crystal X‐ray analysis of unique pseudo‐cubic hydrogen‐bond networks composed of primary ammonium carboxylates were carried out. The networks consist of four carboxylate anions and four primary ammonium cations at the corners of the cube, and twelve charge‐assisted NH⋅⋅⋅O hydrogen bonds on the sides of the cube. The configuration of the carboxylate anions generates topological diversity in the network. The results of this hierarchical classification showed that pseudo‐cubic hydrogen‐bond networks composed of primary ammonium carboxylates can form nine topologically different networks. These pseudo‐cubic networks are a subset of the networks formed by octameric water in the form of an “ice cube”. The classification system can be applied to other pseudo‐cubic networks in a similar way. A survey of crystal structures based on combinations of triphenylacetic acid with various alkylamines (carbon numbers up to eight) and examination of the CSD (Cambridge Structural Database) showed eight salts that form such networks in their crystal structures. These structures are classified into six topologically different networks. Similar networks composed of other salts are also discussed from a topological point of view.