Some studies in inorganic complexes. XXII. Reactions of nickel(II) with chelating heterocyclic bases

1969 ◽  
Vol 22 (1) ◽  
pp. 59 ◽  
Author(s):  
AR Nicholoson ◽  
GJ Sutton
Keyword(s):  
Aqueous Solution ◽  
Near Infrared ◽  
Mixed Ligand ◽  
Infrared Spectrophotometry ◽  
Heterocyclic Ligands ◽  
Nickel Ion ◽  
Physical Measurements ◽  
Inorganic Complexes ◽  
Heterocyclic Bases ◽  
Solid Complexes

Spin-free six-coordinate complexes of nickel(II) and the heterocyclic ligands 2-aminomethylpyridine, 2-methylaminomethylpyridine, 2-(2- aminoethyl)pyridine, and 2-aminomethyl-6-methylpyridine have been prepared and studied. Various hydrated and anhydrous nickel(II) complexes with the anions sulphate, nitrate, halide, and perchlorate were obtained with nickel ion to ligand stoicheiometric ratios of 1 : 1, 1 : 2, and 1 : 3, and in a number of instances water molecule and anion attachments to the coordination sphere are reported; the sulphate complexes are considered to be of the bridged type. Also, certain mixed-ligand solid complexes and mixed-ligand cationic species in aqueous solution were prepared. Physical measurements used to elucidate structures included molecular conductances in suitable solvents, solubility observations, infrared spectrophotometry, pyrolysis methods, and measurements of magnetic susceptibility. Complex cations in aqueous solution were characterized by visible and near-infrared spectrophotometry.

Complexes of Di-2-pyridyl ketone. II. Some chelated nickel(II) products of metal-promoted reactions at the ketones

1970 ◽  
Vol 23 (10) ◽  
pp. 1997 ◽  
Author(s):  
MC Feller ◽  
R Robson
Keyword(s):  
Aqueous Solution ◽  
Spectral Data ◽  
Metal Ion ◽  
Room Temperature ◽  
Cyanide Ion ◽  
Nickel Ion ◽  
Square Planar ◽  
Ligand Fields ◽  
Solid Complexes

From reactions in aqueous solution between nickel(11) nitrate, di-2-pyridyl ketone (DPK), and the reagents MeNH2, NH3, pyrazole ( C3H4N2) , HS03-,PhNHNH2, and 82-, solid complexes with the following stoicheiometries were isolated: Ni(DPK)z(MeNH2)2(N03)z(H2O)x (x: = 1, 0), Ni(DPK)z(NH~)(H2O)(NO3)3, K~(DPK)z(C3H4NZ)2(NO3)Z(H2O)y(y = 3, O), Ni(DPK)Z(HSO4)Z(HZO), Ni(DPK)2- (PhNHNH2)2(N03)2, and Ni(DPK)2(H2O)2S. Magnetic and spectral data indicate pseudo-octahedral ligand fields in all cases. Except in the cases Ni(DPK)2(H20)2S and Ni(DPK)2(PhNHNH2)2(NO3)2, for which the evidence is ambiguous, elementary compositions and i.r. spectra indicate that the added nucleophile, HX, has condensed with at least one of the two DPK units per nickel ion, yielding tridentate products, (C5H4N)2(OH)X. I n the complexes of stoicheiometry Ni(DPK)2(C3H4N2)2(N03)2 and N~(DPK)z(M~NH~)z(NO~)Z both DPK units per nickel ion have condensed with the nucleophile yielding products bound to the cation as tridentate N3 ligands. U.V. spectral observations in aqueous solution indicate that with the reagents MeNH2, NH3, C ~ H ~ N Z , and HS03- attack upon DPK occurs slowly, if a t all, in the absence of nickel(11) a t room temperature, but in the presence of nickel(11) much more rapid condensation occurs. These reactions constitute new types of metal-ion promoted condensation. With cyanide ion as the nucleophile, attack occurs not a t the ketone but a t nickel yielding [Si(DPK)2]2+[Ni(CN)4]z- in w-hich the cation is octahedral, the anion square-planar, and some cyanide units are bridging.

Some studies in inorganic complexes. XXIII. Reactions of copper(II) with chelating heterocyclic bases

1969 ◽  
Vol 22 (2) ◽  
pp. 373 ◽  
Author(s):  
AR Nicholson ◽  
GJ Sutton
Keyword(s):  
Visible Absorption ◽  
Physical Methods ◽  
Absorption Spectrophotometry ◽  
Metal Metal ◽  
Inorganic Complexes ◽  
Halide Complexes ◽  
Anion Attachment ◽  
Heterocyclic Bases ◽  
First Time ◽  
Solid Complexes

Studies have been made of copper(II) complexes of the ligands 2- aminomethyl-pyridine, 2-methylaminomethylpyridine, 2-aminomethyl-6- methylpyridine, and 2-(2-aminoethyl)pyridine. Various hydrated and anhydrous copper(II) complexes with the anions sulphate, nitrate, halide, and perchlorate were obtained with copper(II) ion to ligand in stoicheiometric ratios of 1 : 1 and 1 : 2 and several instances of water molecule and anion attachment to the coordination sphere are reported. Certain sulphate complexes are considered to be of the bridged type, others have sulphate coordinated to the� copper(II) atom by unidentate attachment, and some of the halide complexes are thought most probably to be dimers based upon double halogen to copper bridging. But there are no instances of bridging by metal-metal bonding between adjacent copper atoms since all magnetic moment values for the copper atoms in the complexes are either normal or only very slightly lower than normal. Physical methods used in the elucidation of structures included measurements of molecular conductances in suitable organic solvents, solubility observations, infrared and visible absorption spectrophotometry, pyrolysis methods, and measurements of magnetic susceptibility. Complex cations in aqueous solution were characterized by visible spectrophotometry. ��� A majority of the solid complexes isolated are described for the first time; where complexes have previously been recorded additional physical investigations have been made.

A novel near-infrared fluorescent probe based on isophorone for the bioassay of endogenous cysteine

2021 ◽  
Author(s):  
Hong-Bo Liu ◽  
Hai Xu ◽  
Xin Guo ◽  
Jian Xiao ◽  
Zheng-Hong Cai ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Fluorescent Probe ◽  
Near Infrared ◽  
Stokes Shift ◽  
Rapid Identification ◽  
Large Stokes Shift

A near-infrared (NIR) fluorescent probe with a large Stokes shift (143 nm) for the rapid identification of Cys over Hcy and GSH in aqueous solution was developed.

Optical Absorption Spectroscopy of DNA-Wrapped HiPco Carbon Nanotubes

2019 ◽  
Vol 943 ◽  
pp. 95-99
Author(s):  
Li Jun Wang ◽  
Kazuo Umemura
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Near Infrared ◽  
Nir Spectroscopy ◽  
Optical Characterization ◽  
Optical Absorption Spectroscopy ◽  
Double Stranded Dna

Optical absorption spectroscopy provides evidence for individually dispersed carbon nanotubes. A common method to disperse SWCNTs into aqueous solution is to sonicate the mixture in the presence of a double-stranded DNA (dsDNA). In this paper, optical characterization of dsDNA-wrapped HiPco carbon nanotubes (dsDNA-SWCNT) was carried out using near infrared (NIR) spectroscopy and photoluminescence (PL) experiments. The findings suggest that SWCNT dispersion is very good in the environment of DNA existing. Additionally, its dispersion depends on dsDNA concentration.

One-pot synthesis of ternary CuInS2quantum dots with near-infrared fluorescence in aqueous solution

RSC Advances ◽  
2012 ◽  
Vol 2 (3) ◽  
pp. 819-825 ◽  
Author(s):  
Siyu Liu ◽  
Hao Zhang ◽  
Yu Qiao ◽  
Xingguang Su
Keyword(s):  
Aqueous Solution ◽  
Near Infrared ◽  
One Pot ◽  
Near Infrared Fluorescence ◽  
One Pot Synthesis

Metal ion – biomolecule interactions. X. Synthesis, spectroscopic and magnetic resonance investigations of methylmercury(II) complexes of the sulfur modified nucleosides 6- mercaptopurine riboside and 2-amino-6-mercaptopurine riboside

1986 ◽  
Vol 64 (3) ◽  
pp. 442-448 ◽  
Author(s):  
E. Buncel ◽  
R. Kumar ◽  
A. R. Norris
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Chemotherapeutic Agents ◽  
Modified Nucleosides ◽  
Coupling Constants ◽  
Heterocyclic Ligands ◽  
Methylmercury Poisoning ◽  
Insight Into ◽  
C Nmr ◽  
Ligand Bond

A number of methylmercurated complexes of 6-mercaptopurine riboside and 2-amino-6-mercaptopurine riboside (6-MNucH2) containing S-bound CH3Hg(II) in neutral and cationic complexes (as in [CH3Hg(6-MNucH)] and [CH3Hg(6-MNucH2)]NO3), S- and N-bound CH3Hg(II) (as in [(CH3Hg)2(6-MNucH)]NO3), and S-, N-, C-bound CH3Hg(II) (as in [(CH3Hg)3(6-MNuc)]NO3) have been prepared in aqueous solution at appropriate pH and mole ratios of the constituents. The complexes were characterized by means of 1H and 13C nmr and ir spectroscopy and elemental analysis. Formation of C-bound methylmercurated species extends our previous results obtained with xanthosine, inosine, and imidazole derivatives, and substantiates our proposal that activation through electrophilic coordination at N(7) is a requirement for C(8)—H abstraction. 2J(1H–199Hg) coupling constants, measured in (CD3)2SO for a number of CH3Hg(II) complexes of N-, S-, and C-donor heterocyclic ligands, including the 6-mercaptopurine riboside of the present study, correlate well with the 1J(13C–199Hg) coupling constants, according to 1J = 8.4602J − 155.6. The significance of this correlation in terms of the strength of the Hg–ligand bond is considered. The results could provide insight into the apparent selectivity of binding of CH3Hg(II) by bio-ligands, as well as in the design of chemotherapeutic agents for the treatment of methylmercury poisoning.

Hydration numbers by near-infrared spectrophotometry. 2. Sugars

1983 ◽  
Vol 87 (4) ◽  
pp. 695-696 ◽  
Author(s):  
J. Leland Hollenberg ◽  
David O. Hall
Keyword(s):  
Near Infrared ◽  
Hydration Numbers ◽  
Infrared Spectrophotometry
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