Synthesis,characterization And Structures Of Nitrogen Containing Ligands& Metal Complexes

In the field of Coordination Chemistry,Nitrogen containing ligands has been attracted much attention for decades.In this thesis,synthesis of new nitrogen-containing structure complexes as researching goal to carry out the work,starting from the construction of multi-dimensional structure of complex,to study its coordination characteristics.Schiff-based ligands and N-heterocyclic carbene ligands are choosen to study in this thesis.Inside,different nitrogen ligands are designed as building unit,and appropriate transition metal-salt for coordination.As a result,three new structures are obtained from above mentioned complexes.The complexes are characterized by IR,single-crystal diffractometer,and SQu ID magnetometry stuies on magnetic property are also discussed.1.Complex Ni L¹³is prepared through the coordination reaction.The bidentate ligand schiff base HL¹,was electrophilically substituted by pyrrolidine 2-formaldehyde molecule to form a new multidentate schiff base ligand HL¹³,and then coordinates with Ni(II)ions in the aprotic solvent of acetonitrile to form a complex.From the crystal data,it can be seen that crystal Ni L¹³ belongs to the orthogonal crystal system,the space group Pca21,and Ni L¹³ is mononuclear structure whose structural unit is composed of a Ni(II)ion and a ligand HL¹³.The Ni(II)ions in Ni L¹³form a planar quadrilateral configuration with the ligand HL¹³in the manner of tetrad coordination.2.Cu L¹²is a heterocyclic complexes prepared through the reaction of the ligands HL¹²,pyridine acid,and Cu(II)ions in the protic solvent methanol under base condition.The crystallographic studies show that,cell unit of Cu L¹² cell units contain two independent structure unit,one is a mesoionic ligand 2,3-diphenyltetrazole-5-thione ligand,derived from an unusual cyclization of diphenylthiocarbazone.the other one is a tetra-coordinate planar Cu(II)complexes.The mesoionic ligand HL¹² is weakly interacted with a planar Cu(II)complex via S…Cu electrostatic force while S donor atom sits on the top of a pyramidal geometry of five-coordinated Cu(II)complex.3.The formation of complex Ni L¹¹ is prepared through the coordination reaction of the ligands HL¹¹,postassium carbonate,and nickel cholride in refluxing solvent of methyl alcohol.The imidazole salt ligand HL¹¹,which is the N-heterocyclic carbene precursor.The protons are removed by in situ reaction to generate free carbine,then coordinated with nickel cholride to obtain the complex Ni L¹¹.From the crystal data:crystal Ni L¹¹ belongs to the tetragonal crystal system,space group P4(3)2(1)2,Ni L¹¹is a complex of mononuclear structure,and its structural unit is composed of a Ni(II)ion and a ligand HL¹¹ molecule.The Ni(II)ions in Ni L¹¹ are in the form of tetra-coordination,forming a planar quadrilateral configuration with HL¹¹.