Complex Formation of NiII, CuII, PdII, and CoIII with 1,2,3,4-Tetraaminobutane
摘要:
Complex formation of the two tetraamine ligands (2S,3S)-1,2,3,4-tetraaminobutane (threo-tetraaminobutane. ttab) and (2R,3S)-1,2,3,4-tetraaminobutane (erythro-tetraaminobutane. etab) with Co-III, Ni-II. Cu-II, and Pd-II was investigated in aqueous solution and in the solid state. For Ni-II and Cu-II, the pH-dependent formation of a variety of species [(MxLyHz)-L-II]((2x+z)+) was established by potentiometric titrations and UV/Vis spectroscopy. In sufficiently acidic solutions the divalent cations formed a mononuclear complex with the doubly protonated ligand of composition [M(H2L)](4+). An example of such a complex was characterized in the crystal structure of [Pd(H(2)ttab)Cl-2]Cl-2.H2O. If the metal cation was present in excess. increase of pH resulted in the formation of dinuclear complexes [M2L](4+). Such a species was found in the crystal structure of [Cu-2(ttab)Br-4].H2O. Excess ligand, on the other hand, lead to the formation of a series of mononuclear bis-complexes [M-q(HxL)(HyL)]((q+x+y)+). The crystal structure of [Co(Hetab)(2)][ZnCl4](2)Cl . H2O with the inert, trivalent Co-III center served as a model to illustrate the structural features of this class of complexes. By using an approximately equimolar ratio of the ligand and the metal cation, a variety of polymeric aggregates both in dilute aqueous solution and in the solid state were observed. The crystal structure of Cu-2(ttab)(3)Br-4, which exhibits a two-dimensional. infinite network, and that of [Ni-8(ttab)(12)]-Br-16. 17.5H(2)O, which contains discrete chiral [Ni-8(ttab)(12)](16+) cubes with approximate T symmetry, are representative examples of such polymers. The energy of different diastereomeric forms of such complexes with the two tetraamine ligands were analyzed by means of molecular mechanics calculations, and the implications of these calculations for the different structures are discussed.
A new chiral coordination polymer based on [Fe(CN)6]4−, Cu2+ cations, and (2S, 3S)-1,2,3,4-tetraaminobutane: Synthesis, structure, and ESR spectra
作者:Yu. V. Mironov、V. A. Nadolinny、D. Yu. Naumov、K. Hegetschweiler、V. E. Fedorov
DOI:10.1007/s11172-007-0073-5
日期:2007.3
[Cu(NH3)(threo-tab)}2Fe(CN)6]·8H2O was synthesized by the reaction of an aqueous solution of potassium hexacyanoferrate with an ammonia solution of copper(II) chloride and (2S,3S)-1,2,3,4-tetraaminobutane (threo-tab). The structure of the coordination polymer was established by X-ray diffraction. The ESR spectra of this compound were measured for a powder and a single crystal.
通过六氰基高铁酸钾水溶液与氯化铜(II)和(2S)氨溶液反应合成了新型手性配位聚合物[Cu(NH3)(threo-tab)}2Fe(CN)6]·8H2O ,3S)-1,2,3,4-四氨基丁烷(苏制标签)。配位聚合物的结构是通过 X 射线衍射确定的。该化合物的ESR光谱是针对粉末和单晶测量的。
Rhenium–Chalcogenide–Cyano Clusters, Cu2+ Ions, and 1,2,3,4-Tetraaminobutane as Molecular Building Blocks for Chiral Coordination Polymers
作者:Yuri V. Mironov、Nikolai G. Naumov、Konstantin A. Brylev、Olga A. Efremova、Vladimir E. Fedorov、Kaspar Hegetschweiler
DOI:10.1002/anie.200351595
日期:2004.2.27
Complex Formation of NiII, CuII, PdII, and CoIII with 1,2,3,4-Tetraaminobutane
Complex formation of the two tetraamine ligands (2S,3S)-1,2,3,4-tetraaminobutane (threo-tetraaminobutane. ttab) and (2R,3S)-1,2,3,4-tetraaminobutane (erythro-tetraaminobutane. etab) with Co-III, Ni-II. Cu-II, and Pd-II was investigated in aqueous solution and in the solid state. For Ni-II and Cu-II, the pH-dependent formation of a variety of species [(MxLyHz)-L-II]((2x+z)+) was established by potentiometric titrations and UV/Vis spectroscopy. In sufficiently acidic solutions the divalent cations formed a mononuclear complex with the doubly protonated ligand of composition [M(H2L)](4+). An example of such a complex was characterized in the crystal structure of [Pd(H(2)ttab)Cl-2]Cl-2.H2O. If the metal cation was present in excess. increase of pH resulted in the formation of dinuclear complexes [M2L](4+). Such a species was found in the crystal structure of [Cu-2(ttab)Br-4].H2O. Excess ligand, on the other hand, lead to the formation of a series of mononuclear bis-complexes [M-q(HxL)(HyL)]((q+x+y)+). The crystal structure of [Co(Hetab)(2)][ZnCl4](2)Cl . H2O with the inert, trivalent Co-III center served as a model to illustrate the structural features of this class of complexes. By using an approximately equimolar ratio of the ligand and the metal cation, a variety of polymeric aggregates both in dilute aqueous solution and in the solid state were observed. The crystal structure of Cu-2(ttab)(3)Br-4, which exhibits a two-dimensional. infinite network, and that of [Ni-8(ttab)(12)]-Br-16. 17.5H(2)O, which contains discrete chiral [Ni-8(ttab)(12)](16+) cubes with approximate T symmetry, are representative examples of such polymers. The energy of different diastereomeric forms of such complexes with the two tetraamine ligands were analyzed by means of molecular mechanics calculations, and the implications of these calculations for the different structures are discussed.