Synthesis and Structures of Four Metal‐Organic Coordination Compounds with Isomeric Tripodal Ligands.

Four new metal‐organic coordination compounds [Ni(L4)2](ClO4)2·2H2O (1), [Cu2(L4)2(H2O)2(Cl)](Cl)3·5H2O (2), [Cu2(L3)2(H2O)(Cl)](Cl)2·(NO3)·6H2O (3), and [Cu(L3)(H2O)(NO3)](NO3)·H2O (4), were synthesized and characterized by X‐ray crystallography with two isomeric tripodal ligands N1‐(2‐amino‐ethyl)‐N1‐pyridin‐3‐ylmethyl‐ethane‐1,2‐diamine (L3) and N1‐(2‐amino‐ethyl)‐N1‐pyridin‐4‐ylmethyl‐ethane‐1,2‐diamine (L4), respectively. It was found that coordination compound 1 exhibits mononuclear structure, and coordination compound 2 displays a one dimensional (1D) zigzag chain structure. Coordination compound 3 shows interesting cyclic hexanuclear structure, whereas coordination compound 4 is a 1D zigzag chain structure. The results indicate that metal ions, organic ligands, and anions have remarkable influence on the formation and structures of the coordination compounds. [ABSTRACT FROM AUTHOR]