Single and Double Chainlike Manganese Coordination Polymers of Linear Ligands:Synthesis, Structure and Magnetism

摘要

Two single and double chain manganese coordination polymers [[Mn(L 1)(H2O)2]NO3] n (1) and [Mn(L2)2(H2O)]n (2) (HL 1 =2,2':6',2'"-terpyridine-4'-carboxylic acid,HL2 =4'-(4-carboxyphenyl)-2,2':6',2"-terpyridine) have been synthesized hydrothermally,and characterized by elemental analysis,IR spectroscopy,and X-ray single-crystal diffraction.Compound 1 crystallizes in monoclinic space group P2/c,while 2 crystallizes in triclinic,space group Pi.Crystal data for 1:C16H14MnN4O7,Mr =429.25,a =10.684(2),b =9.338(1),c =9.896(2) (A),β =113.89(3)°,V=902.7(3) (A)3,Z =2,T=153(2) K,Dc=1.579 g/cm3,μ =0.780mm-1,F(000) =438,R =0.1084,wR =0.3507,and GOF =1.069;For 2:C44H3oMnN6O5,Mr =777.68,a =11.255(2),b =11.554(2),c =15.417(3) (A),α =107.28(3),β =101.07(3),y =107.23(3)°,V =1740.2(6) (A)3,Z =2,T =293(2) K,Dc =1.484 g/cm3,μ =0.440 mm-1,F(000) =802,R =0.0471,wR =0.1050,and GOF =0.948.In both compounds,the central Mn(Ⅱ) ions adopt the same distorted pentagonal-bipyramid geometry [MnN3O4] with different secondary structure units.L 1 l igand adopts the μ2-1κ3N,N',N":2κ2O,O" mode to coordinate with mononuclear manganese to build a single chainlike compound 1,while L2 employs μ3-lκ3N,N',N":2κ2O,O':3κ1O and lκ1Omodes to link dimeric Mn2O2 to exhibit a double chainlike 2.Both compounds display weak antiferromagnetic coupling interactions.