Two calcium salts of o-tolidine-6,6′-disulfonate

Brian J. Gunderman, Philip J. Squattrito

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The dibasic and monobasic calcium salts of o-tolidine-6,6′-disulfonic acid, tetraaqua(4,4′-diamino-5,5′-dimethyl-1,1′- biphenyl-2,2′-disulfonato-O:O′)calcium, [Ca(C14H14N2O6S2)(H 2O)4], (I), and hexaaqua (4-amino-4′-ammonio-5,5′-dimethyl-1,1′-biphenyl-2,2′- disulfonato-O)calcium 4-amino-4′-ammonio-5,5′-dimethyl-1,1′-biphenyl-2,2′- disulfonate hexahydrate, [Ca(C14H15N2O6S2)(H 2O)6](C14H15N2O 6S2).6H2O, (II), have structures built upon layers of anions, with the calcium cations and water molecules between these layers. The calcium ions are seven-coordinate. The coordination sphere in compound (I) contains three sulfonate O atoms and four water molecules, while that in (II) contains one sulfonate O atom and six water molecules. Both structures are held together by a network of hydrogen bonds involving the amine, sulfonate and water groups. The biphenyl rings in the anions are approximately 75° out of parallel and the ortho-sulfonate groups are in an anti conformation.

Original languageEnglish
Pages (from-to)1896-1901
Number of pages6
JournalActa Crystallographica Section C: Crystal Structure Communications
Issue number8
StatePublished - Aug 15 1996


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