Carboxylate Groups in a 90° Arrangement: 1,3-Allenedicarboxylic Acid and Its Alkali Metal and Thallium(I) Coordination Compounds

With its two carboxylate functions arranged in an 90° angle, 1,3‐allenedicarboxylic acid (point group C 1 ) possesses a symmetry distinguished from all other dicarboxylic acids which are generally utilized as linker compounds in coordination polymers or MOFs. Crystal structures of coordination compounds with the 1,3‐allenedicarboxylate dianion are reported herein for the first time. The diacid was converted with metal carbonates M 2 CO 3 to...