Kristallstrukturen von 6,7-Dimethyl-2,3-bis(2-pyridyl)chinoxalin-tetraphenylborat und -dihydrochlorid: Von einer intramolekularen Wasserstoffbrücke bei Einfachprotonierung zu einem intermolekularen Netzwerk bei Zweifachprotonierung
1998
6,7-Dimethyl-2,3-bis(2-pyridyl)quinoxaline presents another example for structural distortions upon protonation and for the dominating influence of the anion on the crystal packing: An intramolecular hydrogen bridge forms upon monoprotonation and with the sterically wrapped tetraphenyloborate anion, whereas upon diprotonation in concentrated HCl a dichloride dihydrate with an interamolecular H-bridge network crystallizes.
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