Diphenic acid–4,4′-bipyridine (2/1)

Lee, Ting Wai; Lau, Jasmine Po Kwan; Szeto, Lap

doi:10.1107/s1600536803012194

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…Moreover, the coexistence of a carboxylic acid dimer in the presence of such a supramolecular heterosynthon , is rare. Indeed, to date, there are only few reported cases of a carboxylic acid dimer homosynthon in the presence of a heterosynthon. − We are currently working to increase the number of co-crystals in this family of solids to determine those factors responsible for the coexistence of the O−H···O heterosynthon and carboxylic acid dimer.…”

Section: Discussionmentioning

confidence: 99%

Co-Crystals of Caffeine and Hydroxy-2-naphthoic Acids: Unusual Formation of the Carboxylic Acid Dimer in the Presence of a Heterosynthon

et al. 2007

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A group of caffeine-containing co-crystals of hydroxy-2-naphthoic acids were synthesized and analyzed via single-crystal X-ray diffraction and IR analysis. The imidazole-carboxylic acid synthon was observed in co-crystals involving 1-hydroxy-2-naphthoic and 3-hydroxy-2-naphthoic acid. In the case of 6-hydroxy-2-naphthoic acid, the co-crystal exhibits a hydrogen-bonded carboxylic acid dimer in the presence of a hydroxyl-caffeine heterosynthon.

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Section: Discussionmentioning

confidence: 99%

Co-Crystals of Caffeine and Hydroxy-2-naphthoic Acids: Unusual Formation of the Carboxylic Acid Dimer in the Presence of a Heterosynthon

et al. 2007

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“…On the other hand, some dicarboxylic acids were also used for co-crystallization (e.g. [25][26][27][28][29] ). It seemed also interesting to recognize if the even-odd effect will be visible in this series of compounds.…”

Section: Introductionmentioning

confidence: 99%

Even–odd effect in the co-crystals of pyrazine and dicarboxylic acids

Dutkiewicz

Kubicki

2014

Struct Chem

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The co-crystals of pyrazine with dicarboxylic acids of the form (COOH)-(CH 2 ) n -COOH: oxalic (n = 0), malonic (n = 1) succinic (n = 2), glutaric (n = 3), adipic (n = 4), and pimelic (n = 5) acid, were synthesized and structurally characterized by means of X-ray diffraction. There are two principal structural motifs, depending on the stoichiometry: for 1:1 co-crystals, there are chains of alternate pyrazine and acid molecules, connected by strong O-HÁÁÁN hydrogen bonds (ÁÁÁpyrÁÁÁacidÁÁÁpyrÁÁÁacidÁÁÁ) while for 2:1 stoichiometry the chains are made of pyrazine molecules and carboxylic acid centrosymmetric dimers (ÁÁÁpyrÁÁÁacidÁÁÁacidÁÁÁpyrÁÁÁ). The first possibility is observed for all acids in the series, while the second one only for these with odd numbers of methylene groups. The geometrical features of the acids do not show the clear indication for a reason of such behavior, the most probable reason can be connected with the possible symmetry of the acid molecule, C i for n even, and with the mutual orientation of terminal carbonyl and hydroxyl groups, defined by improper O=CÁÁÁC=O torsion angles, which are close to 180°for even and have much smaller values for odd n values.

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Head-to-tail photodimerization of a thiophene in a co-crystal and a rare adipic acid dimer in the presence of a heterosynthon

et al. 2014

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Diphenic acid–4,4′-bipyridine (2/1)

Abstract: Key indicatorsSingle-crystal X-ray study T = 298 K Mean '(C±C) = 0.004 A Ê R factor = 0.036 wR factor = 0.054 Data-to-parameter ratio = 12.6For details of how these key indicators were automatically derived from the article, see

Cited by 2 publications

References 3 publications

Co-Crystals of Caffeine and Hydroxy-2-naphthoic Acids: Unusual Formation of the Carboxylic Acid Dimer in the Presence of a Heterosynthon

Co-Crystals of Caffeine and Hydroxy-2-naphthoic Acids: Unusual Formation of the Carboxylic Acid Dimer in the Presence of a Heterosynthon

Even–odd effect in the co-crystals of pyrazine and dicarboxylic acids

Head-to-tail photodimerization of a thiophene in a co-crystal and a rare adipic acid dimer in the presence of a heterosynthon

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