Annual Review 2001
نویسنده
چکیده
The co-crystals of squaric acid with dipyridyl-type ligands, 1 and 2, are isomorphous and form in the triclinic crystal system. The co-crystals contain linear and flat hydrogen-bonded molecular tape structures along the [120] direction (Figure 1). The squarate monoanions form a rare ten-membered dimer linked by two intermolecular O–H···O hydrogen bonds [2.511(3) Å for 1 and 2.503(2) Å for 2]. Each component molecule forms a segregated stack along the c axis. The bond lengths of the squarate monoanion indicate the delocalization of the enolate anion.
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