New Multi-atom Bridging Multicore Synthesis, Characterization And Magnetic Study

In this paper, Squarate(Sq) 4,4[3ipyridinc(Bpy) - Thiocyanato(SCN ) N,N3 is(Nutylthylcneam i nO oxamido and Cyanide(CN) have been selected as multitom bridge ligands. Five novel complexes have been designed and synthesized. The all complexes were characterized by elemental atialyses and conductance, UVisible spectra and IR. The temperature dependence of the magnetic susceptibilities and the magnetic moments for the four complexes were measured. The magnetic analyses were performed using the susceptibility equations based on the Heiscnberg spin? exchange operators and the magnetic parameters J that imply the magnitude and nature of magnetic interaction between the bridged metal ions have been obtained. The discussion was made on the factors that affect spinxchange interaction between the bridged metal ions. The factors include the different terminaligand and balance ions. The crystal structures of the complexes [Ni2(en)4(SCN)2j(C104)2 and 2Cu(L)2Fe(CN)6 have been determinated. The paper will provide the iicw content for the complexes that contain multitom bridgeigand and have a certain of meaning in the respects of exploring the mechanism of the magnetic interaction and using practically of these kinds of complexes in thc life science and the material science. The main characteristics and the contributions of the present paper are: I. The temperature dependence of the magnetic susceptibilities of the complexes (Cu2(HNAQ)2 Sq] 31120 was measured (I INAQ = Hydroxyl aphthaldehyde-8-amino uinoline),demonstrating that different Shiffases as capped ligand have little cflts on the magnetic interaction between the bridged metallic ions. The present result will provide experimental data and important theoritical reference for exploring the mechanism of magnetic interaction between the bridged metallic ions. 2. The complex [Cu2( L)2bpyj (dO4) 2 1120 (I. as terminal ligand and HL N(2ydroxypropyl) ,2ropylcncdiamine) was synthesized. The complex demonstrates the strong magnetic interaction (2J = 99.0 cnf. According to our best knowledge, the magnetic exchange integral 12J1 between Cu( II) u( II) ions bridged by 4,4ipyridine is no larger than 3 cm The present result will have important theoritical meaning in exploring the mechanism of magnetic interaction between bridged transition metallic ions. 3. The complex [Ni2(L)(Phcn)2(l1,0)j(Cl04)2 (L = oxamido,N is(Nutylthyleneamine), phen = 1,1 0henanthroline) was synthesized. The magnetic coupling parameter between Ni( II) Ni( II) was obtained (2J = 2.3 cm,which is smaller(absolute value)than that of the other complexes with the oxamido as the bridged ligand. he main factor is that the present bridging ligand has more bulky substituent, i.e. the Nutyl, which must cause the lower colane of the complex and the smaller overlap of the magnetic orbitals. And this in turn leads the weaker magnetic interaction. 4.The complex Cu2L4Fe(CN)6 was synthesized, which may be thefirst complex that have a three-dimensional structure with the CN asthe bridged ligand. The complex was charactered by tl1e IR spectraand the crystal structure was charactered by X-Ray po'vcr diffractionand XPS. This work will have an important meanil1g il1 the respcctof the molecular ferromagnet.