Lanthanide-3d cyanometalate chains Ln(III)-M(III) (Ln=Pr, Nd, Sm, Eu, Gd, Tb; M=Fe) with the tridentate ligand 2,4,6-tri(2-pyridyl)-1,3,5-triazine (tptz): evidence of ferromagnetic interactions for the Sm(III)-M(III) compounds (M=Fe, Cr)

A series of cyanide-bridged chain mixed Fe(III)/Ln(III) (Ln=Pr, Nd, Sm, Eu, Gd, Tb) complexes with the tridentate ligand 2,4,6-tri(2-pyridyl)-1,3,5-triazine (tptz) used as a capping group has been prepared. Reactions of tptz and LnCl3 with K3Fe(CN)6 yield a family of air-stable 1-D compounds {Pr(tptz)(H2O)4Fe(CN)6].8H2O}infinity, {Nd(tptz)(H2O)4Fe(CN)6].8H2O}infinity, {Sm(tptz)(H2O)4Fe(CN)6].8H2O}, {Eu(tptz)(H2O)4Fe(CN)6].6H2O}infinity, {Gd(tptz)(H2O)4Fe(CN)6].6H2O}infinity, and {Tb(tptz)(H2O)4Fe(CN)6].8H2O}infinity. Temperature dependent magnetic susceptibility studies of reveal that in , the Sm(III) and Fe(III) ions are ferromagnetically coupled with 3-D ordering occurring below 3.5 K. The appearance of the frequency dependent out-of-phase signal is explained in terms of an ordering with a spin glass-like behavior. To compare the magnetic behavior of with related compounds, {Sm(tptz)(H2O)4Co(CN)6].8H2O}infinity and {La(tptz)(DMF)(H2O)3Fe(CN)6].5H2O}infinity, {Sm(tmphen)(DMF)3(H2O)Fe(CN)6].2H2O}infinity, {Sm(tmphen)2(H2O)2Fe(CN)6].MeOH.13H2O}infinity and {Sm(tmphen)2(H2O)2Cr(CN)6].MeOH.9H2O}infinity with 3,4,7,8-tetramethyl-1,10-phenanthroline (tmphen) were also prepared.