C(NH 2 ) 3 Cd(C 2 O 4 )Cl(H 2 O)·H 2 O and BaCd(C 2 O 4 ) 1.5 Cl(H 2 O) 2 : Two Oxalate Chlorides Obtained by Chemical Scissors Strategy Exhibiting Low-Dimensional Structural Networks and Balanced Overall Optical Properties.

Low-dimensional crystalline materials have attracted much attention due to their special physical and chemical properties. Herein, two new oxalate chlorides, C(NH 2 ) 3 Cd(C 2 O 4 )Cl(H 2 O)·H 2 O and BaCd(C 2 O 4 ) 1.5 Cl(H 2 O) 2 , were synthesized. C(NH 2 ) 3 Cd(C 2 O 4 )Cl(H 2 O)·H 2 O presents the unique {[Cd(C 2 O 4 )Cl(H 2 O)] - } ∞ zigzag chain, while BaCd(C 2 O 4 ) 1.5 Cl(H 2 O) 2 shows a novel {[Cd(C 2 O 4 ) 1.5 Cl] 2- } ∞ layer. They showed large measured band gaps, which were 3.76 and 4.53 eV, respectively, and the latter was the largest band gap in the A-M-C 2 O 4 -X (A = Monovalent cationic or alkaline earth metals, X = F, Cl, Br, I) family. They exhibit a large calculated birefringence of 0.075 and 0.096 at 1064 nm, respectively. This study promotes the exploration of synthesizing low-dimensional crystalline materials with balanced overall optical performances by a chemical scissors strategy.