scholarly journals Molecular Architectures Derived from Metal Ions and the Flexible 3,3′-Bipyridine Ligand: Unexpected Dimer with Hg(II)

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Anupam Khutia ◽  
Pablo J. Sanz Miguel ◽  
Bernhard Lippert
Keyword(s):  
Nmr Spectroscopy ◽  
Transition Metal ◽  
Metal Ions ◽  
Crystalline Form ◽  
Dinuclear Complex ◽  
Metal Species ◽  
Polymeric Structure ◽  
Bipyridine Ligand ◽  
Molecular Architectures ◽  
Ditopic Ligand

The flexible ditopic ligand 3,-bipyridine (3,-bpy) has been reacted with a series of transition metal species (A, H, cis- ( or ; ), trans- ()) in an attempt to produce discrete cyclic constructs. While A gave a polymeric structure [Ag(3,-bpy)](Cl)   (1), with all other metal entities cyclic structures were formed. Interestingly, Hg(CCOO produced a dinuclear complex [Hg(3,-bpy)(CCOO  3O (2), in which the two 3,-bpy ligands adopt a cis-orientation of the coordinating pyridyl entities. With cis-(, a cyclic complex4was isolated in crystalline form which, according to HRMS, is a trimer. With trans-(, different species are formed according to NMR spectroscopy, the nature of which was not established.

scholarly journals Self-assembly of heteroleptic dinuclear metallosupramolecular kites from multivalent ligands via social self-sorting

2015 ◽  
Vol 11 ◽  
pp. 693-700 ◽  
Author(s):  
Christian Benkhäuser ◽  
Arne Lützen
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Metal Ions ◽  
Self Assembly ◽  
High Fidelity ◽  
Social Self ◽  
Multivalent Ligands ◽  
Troger's Base ◽  
Phenanthroline Ligand ◽  
Bipyridine Ligand

A Tröger's base-derived racemic bis(1,10-phenanthroline) ligand (rac)-1 and a bis(2,2'-bipyridine) ligand with a central 1,3-diethynylbenzene unit 2 were synthesized. Each of these ligands acts as a multivalent entity for the binding of two copper(I) ions. Upon coordination to the metal ions these two ligands undergo selective self-assembly into heteroleptic dinuclear metallosupramolecular kites in a high-fidelity social self-sorting manner as evidenced by NMR spectroscopy and mass spectrometry.

Synthesis, structure and metal ion coordination of novel benzodiazamacrocyclic ligands bearing pyridyl and picolinate pendant side-arms

2019 ◽  
Vol 43 (38) ◽  
pp. 15072-15086
Author(s):  
Pavel A. Panchenko ◽  
Anastasia D. Zubenko ◽  
Ekaterina Y. Chernikova ◽  
Yuri V. Fedorov ◽  
Anna V. Pashanova ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Complex Formation ◽  
Transition Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Transition Metal Ions ◽  
X Ray ◽  
X Ray Crystallography

Complex formation of benzodiazacrown ethers with heavy and transition metal ions was studied using NMR spectroscopy, potentiometry and X-ray crystallography.

Biopolymer-silica Hybrid Aerogels Containing Transition Metal Species; Structure, Properties, and Reactions

2001 ◽  
Vol 702 ◽  
Author(s):  
Xiangjun Hu ◽  
Shuang Ji ◽  
William M. Risen
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Transition Metal Ions ◽  
Silica Aerogels ◽  
Fractal Model ◽  
Metal Species ◽  
Species Structure ◽  
Scattering Function ◽  
Mass Fractal

ABSTRACTNovel transition-metal containing hybrid biopolymer-silica aerogels have been synthesized as transparent monolithic structures. The compositions include Ru(III), Rh(III), Co(II), and Pd(II) species, silica and chitosan, and amine-group-containing biopolymer derived from chitin. Due to its aqueous solubility and hydrogen bonding properties, chitosan was homogeneously incorporated into the silica network. These aerogels have densities in the range of 0.25-0.30 g/cm3, BET surface areas in the range of 600-975 m2/g, and refractive indexes below 1.17 (at 632.8 nm). Infrared spectroscopy shows that chitosan is effectively introduced into the silica aerogels, and the transition metal ions can coordinate with the amine sites on chitosan. This combines the metal-ion interaction of chitosan with that of silica aerogels. Transmission electronic microscopy indicates that the particle sizes of silica are about 2 nm. Small angle neutron scattering (SANS) has been used to study the microstructure of these aerogels. A new Small-Particle Mass-Fractal model scattering function, derived from the Teixeira Mass-Fractal model scattering function, was used to fit the SANS data. It was found that chitosan helps to form an open aerogel structure. It supports a structural model in which there are primary particles that connect with each other closely to form clusters, and these clusters serve as a secondary structural unit to form the chitosan-reinforced aerogel network. It also indicates that chitosan reinforces the interparticle connections. The local environments, structures and chemistries of the transition metal ions have been explored. Of special interest in this regard are the magnetic properties of the Ru(III) containing materials, which are consistent with anti-ferromagnetic coupling, and the reactions of the Rh(III), Ru(III), and Pd(II) species with small gaseous molecules.

HREM Study of electron-induced surface radiation damage in ReO3

1991 ◽  
Vol 49 ◽  
pp. 636-637
Author(s):  
R. Ai ◽  
H.-J. Fan ◽  
L. D. Marks
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Electron Irradiation ◽  
Transition Metal Oxides ◽  
Carbon Film ◽  
Transition Metal Ions ◽  
Surface Radiation ◽  
Valence Transition ◽  
Electron Microscopes

It has been known for a long time that electron irradiation induces damage in maximal valence transition metal oxides such as TiO2, V2O5, and WO3, of which transition metal ions have an empty d-shell. This type of damage is excited by electronic transition and can be explained by the Knoteck-Feibelman mechanism (K-F mechanism). Although the K-F mechanism predicts that no damage should occur in transition metal oxides of which the transition metal ions have a partially filled d-shell, namely submaximal valence transition metal oxides, our recent study on ReO3 shows that submaximal valence transition metal oxides undergo damage during electron irradiation.ReO3 has a nearly cubic structure and contains a single unit in its cell: a = 3.73 Å, and α = 89°34'. TEM specimens were prepared by depositing dry powders onto a holey carbon film supported on a copper grid. Specimens were examined in Hitachi H-9000 and UHV H-9000 electron microscopes both operated at 300 keV accelerating voltage. The electron beam flux was maintained at about 10 A/cm2 during the observation.

Synthesis, Spectral and Antimicrobial Investigation of 2-(Naphthalenel-ylamino)-2- Phenylacetonitrile and 1, 10-Phenanthroline with Five Divalent Transition Metal Ions

2019 ◽  
Vol 10 (01) ◽  
Author(s):  
Mohammed Al-Amery1 ◽  
Ashraf Saad Rasheed ◽  
Dina A. Najeeb
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Molar Conductance ◽  
Octahedral Geometry ◽  
Mixed Ligand ◽  
Gram Negative Bacteria ◽  
Magnetic Studies ◽  
Gram Positive Bacteria

Five new mixed ligand metal complexes have been synthesized by the reaction of divalent transition metal ions (Hg, Ni, Zn, Cu and Cd) with 2-(naphthalen-l-ylamino)-2-phenylacetonitrile (L1 ) and 1,10-phenanthroline (L2). The coordination likelihood of the two ligands toward metal ions has been suggested in the light of elemental analysis, UV-Vis spectra, FTIR, 1H-NMR, flam atomic absorption, molar conductance and magnetic studies. Results data suggest that the octahedral geometry for all the prepared complexes. Antibacterial examination of synthesized complexes in vitro was performed against four bacterias. Firstly, Gram-negative bacteria namely, Pseudomonas aerugin and Escherichia. Secondly, Gram-positive bacteria namely, Bacillus subtilis, Staphylococcuaurouss. Results data exhibit that the synthesized complexes exhibited more biological activity than tetracycline pharmaceutical.

Bond-length distributions for ions bonded to oxygen: Metalloids and post-transition metals

2017 ◽  
Author(s):  
Olivier Charles Gagné ◽  
Frank Christopher Hawthorne
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Metal Ions ◽  
Bond Length ◽  
Lone Pair ◽  
Transition Metal Ions ◽  
Oxygen Lone Pair

Bond-length distributions are examined for thirty-three configurations of the metalloid ions and fifty-six configurations of the post-transition-metal ions bonded to oxygen. Lone-pair stereoactivity is discussed.

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