78307-65-0Relevant articles and documents
Structure and magnetic properties of two two-dimensional copper oxalates: (C6H5CH2NH3)2Cu(C 2O4)2 and (NH3C3H6NH3)Cu(C2O 4)2
Bloomquist,Hansen,Landee,Willett,Buder
, p. 3308 - 3314 (2008/10/08)
The crystal structures of bis(benzylammonium) bis(oxalato)cuprate(II), (C6H5CH2NH3)2Cu(C 2O4)2 ((BA)2Cu(ox)2), and propylenediammonium bis(oxalato)cuprate(II), (C3H6N2H6)Cu(C2O 4)2((PDA)Cu(ox)2), ((PDA)Cu(ox)2), have been determined, and the magnetic susceptibilities of the compounds have been measured from 4 to 300 K. (BA)2Cu(ox)2 belongs to the orthorhombic space group Pbca with a = 7.100 (2) ?, b = 8.004 (2) ?, and c = 35.444 (8) ? while (PDA)Cu(ox)2 is monoclinic, C2/c, with a = 17.901 (3) ?, b = 4.920 (1) ?, c = 14.002 (3) ?, and β = 118.7 (2)°. Each salt contains essentially planar Cu(ox)22- anions, which aggregate to form chain- (PDA) or layer-type (BA) structures. In (BA)2Cu(ox)2, the Cu(ox)22- anions stack in a centered rectangular array in the ab plane, with long interion Cu-O interactions between ions stabilizing the layer structure. The two-dimensional layers are separated by the benzylammonium cations and display antiferromagnetic interactions with J/k = -0.21 K. (PDA)Cu(ox)2 contains one-dimensional chains of the Cu(ox)22- anions parallel to the b axis with pairs of long Cu-O bonds between anions. The PDA ions hydrogen bond adjacent chains together, forming sheets in the be plane. The magnetic data for (PDA)Cu(ox)2 can be fit to a ferromagnetic S = 1/2 one-dimensional model (J/k = 19 K). Strong antiferromagnetic coupling between chains also exists (J′/k = -11 K).