1 research outputs found
Two modes of peri-interaction between an aldehyde group and a carboxylate anion in naphthalaldehydate salts
Crystal structures of the salts of 1,8-naphthalaldehydic acid (8-formyl-1-naphthoic acid) show one of two types of interaction between the functional groups. In the more commonly observed case, a carboxylate oxygen lies close to the aldehyde carbonyl carbon atom (OâŻC: 2.445â2.630 Ă
) and makes an nâpi* interaction. However, in two other cases the carboxylate group has rotated so that the aldehyde now directs its hydrogen atom at the face of the carboxylate group and forms a surprisingly short contact with the carbon atom (HâŻC: 2.29 and 2.42 Ă
). This interaction is likely to be electrostatic in nature