The Synthesis and Structures of Tris(2-pyridylseleno)methyl Zinc Compounds with κ2-, κ3-, and κ4-Coordination Modes

2013 ◽  
Vol 66 (10) ◽  
pp. 1306 ◽  
Author(s):  
Yi Rong ◽  
Gerard Parkin
Keyword(s):  
1H Nmr ◽  
Zinc Complex ◽  
Variable Temperature ◽  
Spectroscopic Studies ◽  
Zinc Compounds ◽  
Coordination Modes

Tris(2-pyridylseleno)methane, [Tpsem]H, has been employed to synthesize the bis(trimethylsilyl)amido zinc complex [κ3-Tpsem]ZnN(SiMe3)2. The latter compound provides access to a variety of other [Tpsem]ZnX derivatives, which include the isocyanate complex [κ4-Tpsem]ZnNCO, the hydrosulfido complex [κ3-Tpsem]ZnSH, the sulfido complex {[κ3-Tpsem]Zn}2(μ-S), the 2 : 1 complex [κ2-Tpsem]2Zn and the pyridyl-2-selenolate complex [κ4-Tpsem]Zn-(κ2-SeC6H4N), thereby demonstrating that the [Tpsem] ligand can exhibit κ2-, κ3-, and κ4-coordination modes. Variable-temperature 1H NMR spectroscopic studies demonstrate that [κ3-Tpsem]ZnN(SiMe3)2, [κ3-Tpsem]ZnSH, and {[κ3-Tpsem]Zn}2(μ-S) are fluxional on the NMR timescale.

ChemInform Abstract: Comparison of Variable-Temperature 1H NMR Spectra of Five-Coordinate High-Spin (S = 5/2) Iron(III) Porphyrins and Chlorins

ChemInform ◽  
1988 ◽  
Vol 19 (36) ◽  
Author(s):  
M. J. PAWLIK ◽  
P. K. MILLER ◽  
E. P. JUN. SULLIVAN ◽  
M. A. LEVSTIK ◽  
D. A. ALMOND ◽  
...  
Keyword(s):  
1H Nmr ◽  
High Spin ◽  
Nmr Spectra ◽  
Variable Temperature ◽  
1H Nmr Spectra

A variable temperature 1H NMR and DFT study of procyanidin B2 conformational interchange

2018 ◽  
Vol 29 (5) ◽  
pp. 1551-1564 ◽  
Author(s):  
S. J. O’Kennedy ◽  
A. de Villiers ◽  
D. J. Brand ◽  
W. J. Gerber
Keyword(s):  
1H Nmr ◽  
Variable Temperature ◽  
Dft Study

scholarly journals Variable temperature 1H NMR studies on Grubbs catalysts

2008 ◽  
Vol 693 (7) ◽  
pp. 1252-1260 ◽  
Author(s):  
Margaret M. Gallagher ◽  
A. Denise Rooney ◽  
John J. Rooney
Keyword(s):  
1H Nmr ◽  
Variable Temperature ◽  
Nmr Studies ◽  
Grubbs Catalysts

scholarly journals Investigations on Terminalia Arjuna Fruits: Part 1- Isolation of Comounds from Petroleum Ether Fractions

1970 ◽  
Vol 43 (1) ◽  
pp. 123-130 ◽  
Author(s):  
M Zahurul Haque ◽  
M Abdullah As Saki ◽  
M Umar Ali ◽  
M Yusuff Ali
Keyword(s):  
Petroleum Ether ◽  
Key Words ◽  
1H Nmr ◽  
13C Nmr ◽  
Chromatographic Separation ◽  
Spectroscopic Studies ◽  
Biologically Active ◽  
Terminalia Arjuna ◽  
Pure Compounds ◽  
Column Chromatographic

Arjun (Terminalia arjuna) is a source of many potent, biologically active compounds, planned all over Bangladesh. The chemical examinations of its fruits were taken up to isolate and identify active principles. For this purpose fresh fruits of Terminalia arjuna were extracted with rectified spirit. The extract was then triturated with petroleum ether (40-60°C), which was then subjected to column chromatographic separation followed by PTLC. Such separation led to the isolation of some new pure compounds, TA-1 to TA-5. The structures of compounds were characterized through spectroscopic studies (IR, 1H-NMR and 13C-NMR). Key words: Arjun, TA-1, TA-5, Spectroscopic studies DOI: 10.3329.bjsir.v43i1.863 Bangladesh J. Sci. Ind. Res. 43(1),123-130, 2008

scholarly journals Solution-State Spin Crossover in a Family of [Fe(L)2(CH3CN)2](BF4)2 Complexes

2019 ◽  
Vol 5 (2) ◽  
pp. 22
Author(s):  
Benjamin Wilson ◽  
Hayley Scott ◽  
Rosanna Archer ◽  
Corine Mathonière ◽  
Rodolphe Clérac ◽  
...  
Keyword(s):  
Thermodynamic Parameters ◽  
General Formula ◽  
Spin Crossover ◽  
Variable Temperature ◽  
Spectroscopic Studies ◽  
Solution State ◽  
Uv Visible ◽  
State Spin

We report herein on five new Fe(II) complexes of general formula [Fe(L)2(NCCH3)2](BF4)2•xCH3CN (L = substituted 2-pyridylimine-based ligands). The influence of proximally located electron withdrawing groups (e.g., NO2, CN, CF3, Cl, Br) bound to coordinated pyridylimine ligands has been studied for the effect on spin crossover in their Fe(II) complexes. Variable-temperature UV-visible spectroscopic studies performed on complexes with more strongly electronegative ligand substituents revealed spin crossover (SCO) in the solution, and thermodynamic parameters associated with the spin crossover were estimated.

scholarly journals Mössbauer Spectroscopic Studies of Molecule-Based Magnets: Two-Dimensional Complexes Derived from Metal Schiff-Bases and Hexacyanoferrate(III)

2002 ◽  
Vol 57 (6-7) ◽  
pp. 603-606 ◽  
Author(s):  
S. Iijima ◽  
F. Mizutani ◽  
H. Miyasaka ◽  
N. Matsumoto ◽  
H. Ōkawa
Keyword(s):  
Long Range ◽  
Schiff Bases ◽  
Applied Field ◽  
Variable Temperature ◽  
Magnetic Ordering ◽  
Spectroscopic Studies ◽  
Paramagnetic State ◽  
Two Dimensional ◽  
Mössbauer Measurements

Variable-temperature 57Fe Mössbauer measurements on cyanide-bridged 2-D bimetallic assemblies NEt4[Mn(salen)]2[Fe(CN)6] (1), K[Mn(3-MeOsalen)]2[Fe(CN)6] (2) and K[Mn(3- MeOsalen)]2[Fe(CN)6]2 DMF (3), where salen2- = N,N'-ethylenebis(salicylidene iminato) dianion, revealed that these compounds exhibit a long range magnetic ordering below ca. 10 K under zero applied field. The quadrupole splittings of 1 - 3 showed intermediate values between those of typical cyano-bridged 1-D and 3-D complexes. The paramagnetic state of K[Mn(5-Clsalen)]2- [Fe(CN)6] 4 H2O (4) turned to a bulk magnetic one with desolvation

scholarly journals Synthesis and Spectroscopic Studies of New Palladium(II) Complexes of N-hydroxymethyl Saccharin (Sac-CH2OH) and Amines or Diaminas Ligands

2019 ◽  
Vol 35 (1) ◽  
pp. 186-192 ◽  
Author(s):  
Ahmed S. Al-Janabi ◽  
Adnan A. Al-Dulaimi ◽  
Hayfa M. Gergees ◽  
Mohammed H. Saleh
Keyword(s):  
1H Nmr ◽  
Nmr Spectra ◽  
Spectroscopic Studies ◽  
Mixed Ligand ◽  
1H Nmr Spectra ◽  
Ethylene Diamine ◽  
Mixed Ligand Complexes ◽  
Conductivity Measurements

Treatment of the chelated palladium(II) complex, trans-[Pd(K2-Sac-CH2O)2].2H2O with one mole equivalent of the diammines (L-L), L-L = 2,2'-bipyridine (bipy),. ethylene diamine (en), 1,10-phenanthroline (phen), or N,N-dimethyl ethylene diammine (dmen) in EtOH solvent afforded mixed ligand complexes of the type [Pd(K1-Sac-CH2O)2(L-L)] in 82-93% yield. While treatment of trans-[Pd(K2-Sac-CH2O)2].2H2O with two mole equivalents of the monoamines (L), L=pyridine (py), 3-methylpyridine (3-mpy) or 3-aminopyridine (3-apy) in EtOH solvent gave trans-[Pd(K1-Sac-CH2O)2(L)2] complexes in 86-89% yield The prepared complexes were characterized by elemental CHN analysis, .conductivity measurements,. infrared and 1H nmr spectra.

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