The first section of this thesis includes our efforts for better understanding of the construction of 1D Cu(I) halo aggregates using flexible multidentate schiff base ligands. At first, using the very flexible starting bis amine, four Schiff ligand were synthesized as listed below: phca 2 dapte ( 2 ) , (benz) 2 dapte ( 6 ) , (2,6-diCl ph) 2 dapte ( 8 ) , (4-MeO Ph) 2 dapte ( 10 ) , (4-NO 2 ph) 2 dapte ( 12 ) and (3-NO 2 ph) 2 dapte ( 14 ) Using these ligands and their conformational habits and coordination modes were investigated resulting in the synthesis of: phca 2 dapte: [Cu(phca 2 dapte]ClO 4 ( 3 ), [(Cu(PPh 3 )I) 2 (phca 2 dapte)] ( 4 ), [(Cu(PPh 3 )Br) 2 (phca 2 dapte)] ( 5 ) (benz) 2 dapte: [Cu 2 (µ-I) 2 (µ-(benz) 2 dapte)] n ( 7 ) (2,6-diCl-Ph) 2 dapte : [Cu 2 (µ-I) 2 (µ-(2,6-diCl -Ph) 2 dapte)] n ( 9 ) (4-MeO-Ph) 2 dapte: [Cu 2 (µ-I) 2 (µ-(4-MeO-Ph) 2 dapte)] n ( 11 ) (4-NO 2 -Ph) 2 dapte : [Cu 2 (µ-Br) 2 (µ-(4-NO 2 -Ph) 2 dapte)] n ( 13 ) (3-NO 2 -Ph) 2 dapte : [Cu 2 (µ-Br) 2 (µ-(3-NO 2 -Ph) 2 dapte)] n ( 15 ) The ligand phca 2 dapte ( 2 ) shows a variety of coordination modes from tetradentate in [Cu(phca 2 dapte]ClO 4 ( 3 ), to bis bidentate in [(Cu(PPh 3 )I) 2 (phca 2 dapte)] ( 4 ), and [(Cu(PPh 3 )Br) 2 (phca 2 dapte)] ( 5 ) complexes. Using our knowledge gained from the complexes mentioned above, the ligands (benz) 2 dapte ( 6 ), (2,6-di Cl-Ph) 2 dapte ( 8 ), (4-MeO-Ph) 2 dapte ( 10 ), (4-NO 2 -Ph) 2 dapte ( 12 ), (3-NO 2 -Ph) 2 dapte ( 14 ) were synthesized and 1D cordiantion polymers [Cu 2 (µ-I) 2 (µ-(benz) 2 dapte)] n ( 7 ), [Cu 2 (µ-I) 2 (µ-(2,6-di Cl-Ph) 2 dapte)] n ( 9 ), [Cu 2 (µ-I) 2 (µ-(4-MeO-Ph) 2 dapte)] n ( 11 ), [Cu 2 (µ-Br) 2 (µ-(4-NO 2 -Ph) 2 dapte)] n ( 13 ) and [Cu 2 (µ-I) 2 (µ-(3-NO 2 -Ph) 2 dapte)] n ( 15 ) were obtained from their reactions with CuX. The crystal structures of the complexes ( 3 ), ( 4 ), ( 5 ), ( 7 ) and ( 9 )were determined via single crystal x-ray analysis. In all cases copper (I) center shows little variation in the structure and assumes the normal four coordinated distorted tetrahedral. In contrast, the ligands show versatile conformational and coordination characteristics under different conditions due to their flexibility. In order to impart more regidity to the structure of the ligands and to ensure the prevention of the ligands from folding, a charcteristic that leads to the formation of mono metal complexes, the bis amine daptx was synthesized. Using daptx schiff base ligand phca 2 daptx ( 17 ) was prepared. These ligand was reacted with cooper halide resulting in the following complexe: [Cu 2 (µ-I) 2 (µ-(phca) 2 daptx)] n ( 18 ) The new daptx derivative acts as bis bidentate bridging ligand between two metal centers. In the second part of the thesis our efforts to increase the maximum recorded number of states in the multistate molecular switches is presented.