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Salts of the scissor-shaped racemic host 1,1′-binaphthyl-2,2′-dicarboxylic acid with amines: structure and thermal stability
The salts formed between racemic 1,1′-binaphthyl-2,2′-dicarboxylic acid (BNDA) and the amines diethylamine (DEA), di-n-butylamine (DBA), cyclohexylamine (CHA) and dicyclohexylamine (DCHA) are reported. Structure 1, (BNDA 2− )(2DEA + ), and 2a, (BNDA 2− )(2DBA + ), resulted from slow evaporation of a solution of BNDA in the respective amine. A competition experiment whereby BNDA was dissolved in a mixture of 60% DEA and 40% DBA resulted in a polymorph of 2a, namely 2b. Slow evaporation of dilutedoi:10.1039/c3ce42215a fatcat:h7kmgrrtujenfd7ahp2i7hjlke