biostudies-literature00460Unknown65(Pt 10)Smith GIn the structure of the 1:1 proton-transfer compound of 1,10-phenanthroline with 4,5-dichloro-phthalic acid, C(12)H(9)N(2) (+)·C(8)H(3)Cl(2)O(4) (-), determined at 130?K, the 1,10-phenanthrolinium cation and the hydrogen 4,5-dichloro-phthalate anion associate through a single N-H?O(carbox-yl) hydrogen bond giving discrete units which have no extension except through a number of weak cation C-H?O(anion) associations and weak cation-anion aromatic ring ?-? inter-actions [minimum centroid-centroid separation = 3.6815?(12)?Å]. The anions are essentially planar "[maximum deviation 0.214?(1)?Å (a carboxyl O)] with the syn-related H atom of the carboxyl group, forming a short intra-molecular O-H?O(carbox-yl) hydrogen bond.Acta crystallographica. Section E, Structure reports onlineo2333https://www.ebi.ac.uk/biostudies/studies/S-EPMC2970357biostudies-literature1,10-Phenanthrolin-1-ium 2-carb-oxy-4,5-dichloro-benzoate.PMC2970357Wermuth UDWhite JMSmith G46false1,10-Phenanthrolin-1-ium 2-carb-oxy-4,5-dichloro-benzoate.In the structure of the 1:1 proton-transfer compound of 1,10-phenanthroline with 4,5-dichloro-phthalic acid, C(12)H(9)N(2) (+)·C(8)H(3)Cl(2)O(4) (-), determined at 130?K, the 1,10-phenanthrolinium cation and the hydrogen 4,5-dichloro-phthalate anion associate through a single N-H?O(carbox-yl) hydrogen bond giving discrete units which have no extension except through a number of weak cation C-H?O(anion) associations and weak cation-anion aromatic ring ?-? inter-actions [minimum centroid-centroid separation = 3.6815?(12)?Å]. The anions are essentially planar "[maximum deviation 0.214?(1)?Å (a carboxyl O)] with the syn-related H atom of the carboxyl group, forming a short intra-molecular O-H?O(carbox-yl) hydrogen bond.2009-01-01T00:00:00Z2009 Sep2021-02-21T02:04:11Z2019-03-27T00:00:14ZS-EPMC29703572157780410.1107/S1600536809034448