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Ибрагимов, Б. Т.; Beketov, K. M.; Talipov, S. A.; Aripov, T. F.

doi:10.1023/a:1007992116261

Cited by 6 publications

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“…changing the concentration, temperature and pressure in the crystallization medium. This approach has proved efficient in the example of several well known versatile hosts such as gossypol 7 and its derivatives, 8,9 cyclotriveratrylene 10 and others. 11,12 Applying the same principle to the complex formed between 1,1'-binaphthy1-2,2'-dicarboxylic acid (BNDA) (Scheme 1) and ethanol, exhibiting both proton donor and acceptor abilities, we succeeded in preparing a new modification of the clathrate including half the content of the guest component and also the guest free host.…”

Section: Introductionmentioning

confidence: 99%

Disorder as adaptation of the crystal structure to increase the crystallization temperature. X-ray crystal structure of the host-guest complexes between 1,1′-binaphthyl-2,2′-dicarboxylic acid and dimethyl sulphoxide obtained at 50 and 60 °C

Makhkamov

Ибрагимов

Weber

et al. 1999

J. Phys. Org. Chem.

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Disorder as adaptation of the crystal structure to increase the crystallization temperature. X-ray crystal structure of the host±guest complexes between 1,1'-binaphthyl-2,2'-dicarboxylic acid and dimethyl sulphoxide obtained at 50 and 60°C ABSTRACT: The complex formation of 1,1'-binaphthyl-2,2'-dicarboxylic acid ( , Z = 2, R = 0.053 for 4879 reflections] host-guest complexes obtained at 50 and 60°C, respectively, were determined by xray structure analysis (the crystal structure of the a-form obtained at room temperature was studied previously). There is disorder of the guest molecules characteristic of the a-form of the 1:1 BNDAÁDMSO complex obtained at 50°C and the host carboxylic groups in the b-form of the 1:2 BNDAÁDMSO, considered a consequence of the changed conditions for crystal preparation. By disordering of the crystal structure the interaction of the solvent molecule with its environment, especially with nearest BNDA molecules, is improved. The new orientation leads to the formation of a more compact host-guest associate which resists the escape of the guest molecules from the growing crystal during crystallization and may exist even in the nucleation step. Thus disordering of the solvent molecules (a-form) and disordering of the carboxyl groups of the host molecules (b-form) are the two modes of operation in this system.

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Section: Introductionmentioning

confidence: 99%

Disorder as adaptation of the crystal structure to increase the crystallization temperature. X-ray crystal structure of the host-guest complexes between 1,1′-binaphthyl-2,2′-dicarboxylic acid and dimethyl sulphoxide obtained at 50 and 60 °C

Makhkamov

Ибрагимов

Weber

et al. 1999

J. Phys. Org. Chem.

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“…Crystal structures of a new pseudodimorphous ‡ modification of a BNDA complex with ethanol † For Part 5 see ref. 2. ‡ Polymorphism is generally defined as the existence of chemical substances in two (dimorphism) or more physical forms.…”

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confidence: 99%