Structural diversity of transition-metal coordination polymers and dinuclear metallocycles constructed by bispyridyl-substituted diphthalic diimide ligands

Four coordination polymers (CPs), namely, {[Ni(L 1 ) 2 Cl 2 ]center dot(CHCl 3 )} n ( 1 ), {[Co(L 1 ) 1.5 (NO 3 ) 2 ]center dot(CHCl 3 )} n ( 2 ), {[Ag 2 (L 2 ) 2 (NO 3 ) 2 ]center dot(CHCl 3 )} n ( 3 ), [Cd(L 2 ) 2 (Cl) 2 ] n ( 4 ), and two dinuclear metallocycles, namely, {[Zn 2 (L 3 ) 2 (Cl) 4 ]center dot 2CHCl 3 } n ( 5 ) and [Cu 2 (L 3 ) 2 (Cl) 4 ] ( 6 ), ( L 1 = 2,2 ' -bis(pyridin-3-ylmethyl)-[5,5 ' -biisoindoline]-1,1 ' ,3,3 ' -tetraone), L 2 = 5,5 ' -oxybis(2-(pyridin-3-ylmethyl)isoindoline-1,3-dione), L 3 = 5,5 ' -carbonylbis(2-(pyridin-3-ylmethyl)iso- indoline-1,3-dione)), have been adeptly constructed using solvothermal conditions and successfully delineated by non-destructive single-crystal (X-ray) diffraction. Structural analyses provide insights into a two-dimensional (2D) 4 4 grid layer of complex 1 and a three-dimensional (3D) 6 3 network of 2 . Additionally, the connection between these two complexes is established via hydrogen bonding (C - H center dot center dot center dot O) to further accomplish a threedimensional (3D) supramolecular framework system. Similarly, Complex 3 and 4 possess a one-dimensional (1D) wave-like chain and loop-like chains composed of olive -like metallacycle building units, respectively. These chains are bridged by C - H center dot center dot center dot O hydrogen bond and pi center dot center dot center dot pi stacking interactions to generate 3D supramolecular structure. Finally, complexes 5 and 6 occupies zero-dimensional (0D) square-like array also called as olive -like dimeric M 2 L 2 metallacycles. The distinct structural configurations of the six complexes are in close alliance with different conformations of the N -donor pyridyl ligands and coordination arrangement of the transition metal centers.