In this thesis polymeric comlexes, nanopolymeric complexes, nanocomplexes and complexes with ligands sodium dicyanamide (dca), hexamethylenetetramine (hmt), mefenamic acid (Hmef), diclofenac sodium (dic), pyrazinamide (PZA), 4,4 ? -dicyanamidobiphenyl (bpH 2 ), 4-nitro phenylcyanamide(4-NO 2 pcyd), valproate sodium (valp), Imidazole(HIm), pyrazine (PYZ), lidocaine (LC), thiocyanate potassium (SCN) have been synthesized. . The synthesized compounds have been characterized by FT-IR, UV-Vis, 1 H-NMR spectroscopies, elemental analysis (CHN), single crystal X-ray and Scanning Electron Microscopic images (SEM). The polymeric complexes, CP1 = [Cd(µ-hmt)(µ-dca) 2 ] n ، CP2 = [Cd(mef) 2 (CH 3 OH)] n , CP3 = [Cd 2 (dic) 4 1.5(MeOH) 2 (H 2 O)] n , CP4 = {[Ni( µ1,5 -dca) 2 (µ-hmt)]H 2 O} n , CP5 = {[Mn(µ 1,5 -dca) 2 (PZA) 2 ](PZA) 2 } n , CP6 = {[Zn(µ 1,5 -dca) 2 (PZA) 2 ](PZA) 2 } n have been studied. The gas sorption ability of CP1 has been investigated for CO 2 , CH 4 , and N 2 under different temperatures (295 K, 195 K). Bindings of CP2 and CP3 with calf thymus DNA (CT-DNA), BSA and HSA were investigated by spectroscopic methods. Also, antibacterial, antifungal and cytotoxicity of CP2 and CP3 were studied. Antibacterial activities of CP4 also show greater activity than the reference antibiotic gentamycin against Klebsiella pneumonia. Magnetic susceptibility measurements revealed weak antiferromagnetic exchange interactions between the nickel centers bridged by long hmt and dicyanamides ligands. The CP5 was evaluated for in vitro antimycobacterial and antitumor activities. It demonstrated better in vitro activity against Mycobacterium tuberculosis than pyrazinamide and its MIC value was determined. CP6 was applied to organic electroluminescent (EL) devices as the emitting materials. The EL device emits cyan light originating from this polymer with high brightness and efficiencies. In other part , nanopolymeric complexes CPN7 = [(Au(I)-NCN-R-NCN-Au(III)-NCN-R-NCN-)] n , CPN8 = [Ag(4-NO 2 pcyd)] n have been studied. CPN7, Au nanowires are used in the fabrication of gas sensors. These nanosensors exhibit characteristics of high sensitivity to CO with the determination limit at 1 ppm at room temperature. Furthermore, the nanosensors exhibit a good selective determination of CO under exposure to CH 4 and NO 2 even at 1000 ppm; they can be used to detect low concentrations of CO at room temperature. CPN8 nanoparticle was immobilized on the surface of a glassy carbon electrode (GCE), and the electroactivity behavior was investigated by cyclic voltammetry and differential pulse voltammetry (DPV). The obtained CPN8-modified GCE showed high catalytic activity for the oxidation of dibucaine and naphazoline and also for the simultaneous determination of dopamine and acetaminophen. The nanocomplexes CN9 = [(SnMe 3 ) 2 (µ-bp)(H 2 O) 2 ], CN10 = [(SnMe 3 )(4-NO 2 pcyd)] also have been studied. The in vitro cytotoxicity of CN9 and CN10 was examined against different cancer cell lines. For CN9, a promising growth inhibitory effect against HeLa cells was observed that is slightly higher than that of cisplatin. Moreover, the antimicrobial activity of CN9 and CN10 against different strains of pathogenic bacteria and fungi were tested. The complexes C11 = [Pd(valp) 2 (HIm) 2 ], C12 = [Pd(valp) 2 (PYZ) 2 ], C13 = [Ni(NCS) 2 (LC) 2 ], C14 = [Ni(dca) 2 (LC) 2 ], C15 =[Co(dca) 2 (LC) 2 ], C16 = [Co(NCS) 2 (LC) 2 ], C17 = [Co(mef) 2 (HIm) 2 (CH 3 OH) 2 ] have been studied. The in vitro antimicrobial activity and cytotoxic potential of all the complexes were examined.