Carbon dioxide fixation by zinc(II) complexes with macrocyclic ligand

Two novel zinc(II) coordination complexes [Zn2(L)(CO3)]Br2·7H2O (1) and [Zn2(L)(CO3)]Br2·0.5CH3COCH3·5H2O (2) with 1D chain structure linked by carbonate anions were obtained by reactions of new macrocyclic ligand 3, 6, 9, 12, 20, 23, 26, 29-octaazatricyclo[29.3.1.114,18]hexatriaconta-1(34), 14, 16, 18(36), 31(35), 32-hexaene (L) with zinc salt at an initial pH of ca. 9.5. The results show that carbon dioxide from air was absorbed and converted to carbonate anion during the formation of 1 and 2.