title: Syntheses and characterizations of metal complexes derived from cis,cis-1,3,5-triaminocyclohexane-N,N',N"-triacetic acid.
abstract: A convenient six-step procedure is developed to routinely prepare the hexadentate ligand cis,cis-1,3,5-triaminocyclohexane-N,N',N"-triacetic acid (H3tachta) as an HCl salt. Complexes of gallium(III) and indium(III), [Ga(tachta)] and [In(tachta)], are synthesized from the reactions of the ligand and the corresponding metal precursors. Copper(II), palladium(II), and cobalt(II) complexes, [Cu(Htachta)], [Pd(Htachta)], and [Co(Htachta)], are obtained from the reactions of H3tachta with the corresponding metal chlorides. The structures of H3tachta.3HCl.2H2O (C12H28Cl3N3O8) and [Ga(tachta)] (C12H18GaN3O6) are characterized. The crystal of H3tachta.3HCl.2H2O is monoclinic, of the space group P2(1)/c, with a = 15.1688(4) A, b = 8.4708(2) A, c = 15.9408(2) A, beta = 108.058(1) degrees, and Z = 4; that of [Ga(tachta)] is cubic, of space group Pa3, with a = 14.0762(1) A and Z = 8. The gallium atom of [Ga(tachta)] is six-coordinated in the solid state, and the complex assumes a pseudooctahedronal geometry with the completely deprotonated hexadentate ligand encapsulating the metal ion.
authors.affiliation: Radioimmune & Inorganic Chemistry Section, Radiation Oncology Branch, NCI, NIH, Bethesda, Maryland 20892, USA.
authors.forename: H
authors.initials: H
authors.lastname: Luo
authors.forename: N
authors.initials: N
authors.lastname: Eberly
authors.forename: R D
authors.initials: RD
authors.lastname: Rogers
authors.forename: M W
authors.initials: MW
authors.lastname: Brechbiel
mesh_terms: D018360:Crystallography, X-Ray; D003510:Cyclohexanes / Q000138:chemical synthesis* / Q000737:chemistry; D005710:Gallium Radioisotopes; D007553:Isotope Labeling; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D019216:Metals, Heavy / Q000737:chemistry; D015394:Molecular Structure; D019275:Radiopharmaceuticals / Q000138:chemical synthesis* / Q000737:chemistry; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D003510:Cyclohexanes; D005710:Gallium Radioisotopes; C421107:H3tachta; D008024:Ligands; D019216:Metals, Heavy; D019275:Radiopharmaceuticals