Studies About Fe(?) Complexes Based On Picoline-aliphatic Amine Tetradentate Ligands

The main idea of the early part of this paper is about the introduction of SCO(Spin rossover complexes),Bistable complexes called as well.And we explain the definition,development and relevant of this kind of complexes.In the next we introduced two different kinds of complexes we synthesized.The content were mainly about the different methods and tests of them and we in fact found that the big difference between them is the magnetic susceptibility of them.This most possible reason is that because the appropriately ligand field around Fe(II)in complex 1 instead of 2 or 3 whose ligating atom is one of oxygen with weaker ligand field.As a result both complex 2 and 3 did not express transformation of their spin state from high spin to low spin state.Instead they both have the property of antiferromagnetic which is also have wide application in people' life.In the first chapter we introduced the Bi-stable complexes in detail.And we listed the application of this kind of complexes,such as the molecular switch,memory device,chemical sensors and so on.In the second chapter we introduced two different kinds of complexes we synthesized.During the cooling complex 1 only had high spin state.While after the irradiation of some kind of light it will express the spin state transforming from high spin to low spin state.Furthermore when the temperature is about 80? the complex 1 will experience the relaxation progress from the high spin to low spin state lasting as long as 104s,which had not ever been found in the last.In the third chapter we introduced two complex which both has the property of antiferromagnetic.And analogously the change rule of their magnetic susceptibility is very similar and differently.