Abstract
New convenient synthetic routes into mononuclear and dinuclear transition metal complexes with the ligand α-carboline are described. In addition, a new high yield preparative route for α-carboline is presented. Several novel monomeric transition metal complexes with α-carboline have been synthesized and fully characterized including their x-ray crystal structures. These complexes employ pyridyl nitrogen lone pair electrons of the neutral ligands to form ligand to metal dative bonds. In these cases, the ligands occupy empty sites in either the tetrahedral, CoX2(α-carboline )2 (X = Cl or Br) or octahedral. Mo(CO)4(α-carboline)2 coordination spheres around the metal centers. This ligand also exhibits covalent interactions with charged metal centers in addition to the lone pair donation just described. The complex Pd(N2C11H7)2 (N2C11H8)2 is an interesting example where both covalent and dative interactions exist. The ligand is also capable of forming complexes of the type, M2(L)4, as seen in Ni2 (α-carboline)4 . This complex is of the usual paddlewheel geometry. The synthesis and molecular structure of several iridium complexes are also described. The first, is an a-carboline bridged dimer of the formula [Ir(α-carboline) (COD)]2 (COD = 1,5 cyclooctadiene). The second complex is a peculiar tetramer of the formula [Ir(COD)(μ-H)4(CH3CH2CCH) with an unusual butterfly shaped geometry. The preparation and structure of the compound Mg(pyridine)2(Mes)2 (Mes = 1,3,5-trimethylbenzene) is also described.
Mueller, Timothy Edward (1990). Transition metal complexes with substituted 7-azaindoles. Texas A&M University. Texas A&M University. Libraries. Available electronically from
https : / /hdl .handle .net /1969 .1 /DISSERTATIONS -1190566.