Some metal-ion complexes with ligands formed by reactions of amines with aliphatic carbonyl compounds. IX. Nickel(II) compounds of some b-imino amines, a β-oximato amine and a β-hydrazino amine

1980 ◽  
Vol 33 (6) ◽  
pp. 1231 ◽  
Author(s):  
KR Morgan ◽  
NF Curtis
Keyword(s):  
Magnetic Susceptibility ◽  
Ground State ◽  
Carbonyl Compounds ◽  
Metal Ion ◽  
Spin Coupling ◽  
Singlet Ground State ◽  
Coupling Constant ◽  
Spin Coupling Constant ◽  
Complex Products ◽  
Amine Ligands

Singlet ground state compounds of nickel(II) with tetradentate β-imino amine ligands are formed by reaction of complexes of ethane-1,2- diamine, propane-1,2-diamine, 3-azapentane-1,5-diamine, 4-azaheptane- 1,7-diamine and (2-aminoethyl)piperazine with 4-amino-4-methylpentan-2- one, amp. With 3,6-diazaoctane-1,8-diamine, a compound with a pentadentate β-imino ligand is formed, water completing octahedral coordination, and with 2-aminoethanol a bis compound of a tridentate β-imino amine alcohol ligand is formed. More complex products are formed by the hydrazone and oxime of amp. The oxime compound shows appreciable antiferromagnetism, with the spin-coupling constant, J, about -70 cm-1, determined from magnetic susceptibility measurements over 100-300 K.

Some metal-ion complexes with ligands formed by reactions of amines with aliphatic carbonyl compounds. VIII. Some copper(II) β-Imino alcohol and β-Imino-olato compounds

1980 ◽  
Vol 33 (6) ◽  
pp. 1219 ◽  
Author(s):  
JWL Martin ◽  
NF Curtis
Keyword(s):  
Carbonyl Compounds ◽  
Metal Ion ◽  
Spin Coupling ◽  
Tetradentate Ligand ◽  
Coupling Constant ◽  
Spin Coupling Constant ◽  
Analogous Structure ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Isomeric Structure

Compounds of copper(II) with chelated β-imino alcohols are formed by reaction of 4-hydroxy-4-methylpentan-2-one, hmp, with copper(II) compounds of ethane-1,2-diamine, 2-methylpropane-1,2-diamine, meso-1,2- diphenylethane-1,2-diamine, 2-(pyridin-2-yl)ethanamine, 3-azapentane- 1,5-diamine and 4-azaheptane-1,7-diamine. A dinuclear, spin-coupled di- μ-olato bridged derivative of a β-imino alkoxide, formed by reaction of hmp with 2-(pyridin-2-yl)ethanaminecopper(II), has a spin-coupling constant J of -286 cm-1, based on magnetic susceptibility data over the 100-300 K temperature range. A related compound formed by N,N- diethylethane-1,2-diamine, which could have an analogous structure containing water, or an isomeric structure with the β-imino alcohol and with di-μ-hydroxide bridging, has a J value of about -130 cm-1, similarly determined. The preparation of a copper(11) compound with the tetradentate ligand 4,6-trimethyl-1,9-bis(pyridin-2-yl)-3,7-diazanon-3- ene, by reaction of bis[2-(pyridin-2-yl)ethanamine]copper(II) perchlorate with acetone, is reported.

Some metal-ion complexes with ligands formed by reactions of amines with aliphatic carbonyl compounds. X. Compounds of some tridentate ligands formed by reaction of copper(II) 2-Aminoethanol and 3-Aminopropan-1-ol complexes with 4-Amino-(and 4-Hydroxy)-4-methylpentan-2-one

1980 ◽  
Vol 33 (8) ◽  
pp. 1695 ◽  
Author(s):  
KR Morgan ◽  
NF Curtis
Keyword(s):  
Magnetic Susceptibility ◽  
Carbonyl Compounds ◽  
Metal Ion ◽  
Spin Coupling ◽  
Tridentate Ligands ◽  
Metal Ion Complexes ◽  
Magnetic Susceptibilities ◽  
Condensation Products ◽  
Antiferromagnetic Spin

Compounds of copper(II) perchlorate with 2-aminoethanol (etol) and 3- aminopropan-1-ol (prol) react with 4-amino-4-methylpropan-2-one (amp), and with 4-hydroxy-4-methylpropan-2-one (hmp), to form compounds of stoichiometry [Cu(L)] ClO4, where (L) is a tridentate amine imine olato ligand from amp, or a hydroxy imine olato ligand from hmp. The etol condensation products have 'normal' magnetic susceptibilities, while the prol condensation products show antiferromagnetic spin-coupling. The prol/amp product is diamagnetic at 300 K (-J > 700 cm-1) and the prol/hmp product has a J of -186 cm-1, based on magnetic susceptibility measurements over 100-300 K. Preparations of some related nitrate, thiocyanate and tetrachlorozincate compounds are reported. Possible structures for the compounds are discussed.

The Spectrum of AsF in the Near Vacuum Ultraviolet and Near Infrared Regions

1972 ◽  
Vol 50 (12) ◽  
pp. 1230-1251 ◽  
Author(s):  
D. S. Liu ◽  
W. E. Jones
Keyword(s):  
Relative Position ◽  
Ground State ◽  
Near Infrared ◽  
Vacuum Ultraviolet ◽  
Vibrational Analysis ◽  
Spin Coupling ◽  
Rotational Analysis ◽  
Coupling Constant ◽  
Spin Coupling Constant

Three singlet–triplet transitions, b1Σ+−X3Σ−, c1Π–X3Σ−, and d1Π–X3Σ−, and two 3Π–X3Σ− transitions attributed to the molecule AsF, have been found in the regions 1900–2300 Å and 7000–7400 Å. The vibrational analysis for the observed systems and the rotational analysis of the singlet–triplet transitions are complete. The analysis shows that the ground state X3Σ− belongs to Hund's case c with a spin coupling constant λ of about 70 cm−1. The analysis of the observed transitions and a discussion of the relative position and molecular configurations of the observed states are presented.

Rotational Analysis of the A–X System of the SiCl Molecule

1971 ◽  
Vol 49 (4) ◽  
pp. 407-411 ◽  
Author(s):  
S. R. Singhal ◽  
R. D. Verma
Keyword(s):  
Ground State ◽  
Electronic States ◽  
Rotational Structure ◽  
Spin Coupling ◽  
Quartz Tube ◽  
Rotational Analysis ◽  
Coupling Constant ◽  
Spin Coupling Constant ◽  
Molecular Constants ◽  
Vibrational Levels

The A–X system of the SiCl molecule in the region 4500–6400 Å has been excited by an r.f. discharge through a mixture of argon and a trace of SiCl4 vapor, flowing through a quartz tube. Several red degraded and double headed bands with ν′ = 0, 1, 2, and 3 have been observed and the rotational structure of the 0-5, 0-6, 0-7, 0-8, 0-9, 0-10, 1-9, and 1-10 bands has been analyzed. The analysis shows that the bands arise from a 2Σ–2Π transition, 2Π being the ground state of the molecule. The molecular constants have been determined for both the electronic states. The spin coupling constant, Aν, of the X2Π vibrational levels has been found to follow an equation[Formula: see text]

An estimate of the spin–spin coupling constant, 1J(1H,13C), in gaseous benzene

1996 ◽  
Vol 74 (8) ◽  
pp. 1524-1525 ◽  
Author(s):  
Ted Schaefer ◽  
Guy M. Bernard ◽  
Frank E. Hruska
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Dielectric Constant ◽  
Magnetic Resonance ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Coupling Constant ◽  
Spin Coupling Constant ◽  
Spin Coupling Constants ◽  
Spin Spin Coupling ◽  
Gaseous Benzene

An excellent linear correlation (r = 0.9999) exists between the spin–spin coupling constants 1J(1H,13C), in benzene dissolved in four solvents (R. Laatikainen et al. J. Am. Chem. Soc. 117, 11006 (1995)) and Ando's solvation dielectric function, ε/(ε – 1). The solvents are cyclohexane, carbon disulfide, pyridine, and acetone. 1J(1H,13C)for gaseous benzene is predicted to be 156.99(2) Hz at 300 K. Key words: spin–spin coupling constants, 1J(1H,13C) for benzene in the vapor phase; spin–spin coupling constants, solvent dielectric constant dependence of 1J(1H,13C) in benzene; benzene, estimate of 1J(1H,13C) in the vapor; nuclear magnetic resonance, estimate of 1J(1H,13C) in gaseous benzene.

Form of the dihedral angle dependence of the spin-spin coupling constant JHNNH

1989 ◽  
Vol 25 (3) ◽  
pp. 338-341
Author(s):  
L. M. Kapkan ◽  
A. Yu. Chervinskii ◽  
T. M. Pekhtereva ◽  
Yu. I. Smirnov ◽  
A. F. Dmitruk
Keyword(s):  
Dihedral Angle ◽  
Spin Coupling ◽  
Coupling Constant ◽  
Spin Coupling Constant ◽  
Angle Dependence ◽  
Spin Spin Coupling

Temperature dependence of the carbon-13 proton spin-spin coupling constant in gaseous methane

1987 ◽  
Vol 61 (6) ◽  
pp. 1423-1430 ◽  
Author(s):  
B. Bennett ◽  
W.T. Raynes
Keyword(s):  
Temperature Dependence ◽  
Proton Spin ◽  
Spin Coupling ◽  
Coupling Constant ◽  
Spin Coupling Constant ◽  
Spin Spin Coupling

The proximate spin–spin coupling, 5J(F,CH3), as a quantitative conformational indicator in alkylfluorobenzenes and related compounds

1986 ◽  
Vol 64 (8) ◽  
pp. 1602-1606 ◽  
Author(s):  
Ted Schaefer ◽  
Rudy Sebastian ◽  
Glenn H. Penner ◽  
S. R. Salman
Keyword(s):  
Nuclear Spin ◽  
Spin Coupling ◽  
Torsional Angle ◽  
Rotational Behaviour ◽  
Coupling Constant ◽  
Spin Coupling Constant ◽  
Spin Spin Coupling ◽  
Torsional Potentials ◽  
Derivatives Of ◽  
Related Compounds

The through-space or proximate nuclear spin–spin coupling constant, 5J(F,CH3) = 5J, between methyl protons and ring fluorine nuclei in alkylfluorobenzenes is postulated as [Formula: see text] θ being the torsional angle for the [Formula: see text] bond. A and B are obtained from the known internal rotational behaviour in 2,6-difluoroethylbenzene and the corresponding cumene derivative. The parameterization is tested on the observed 5J in derivatives of 2,4,6-tri-tert-butyl- and 2,4,6-tri-isopropyl-fluorobenzene, in 2-chloro-6-fluoroisopropylbenzene, 2,6-difluoro-α-methylstyrene, and N-methyl-8-fluoroquinolinium halides. A prediction is made for 5J in 2,6-difluoro-tert-butylbenzene. It appears that the present parameterization allows the derivation of approximate torsional potentials from proximate couplings, for example in α,α-dimethyl-2,6-difluorobenzyl alcohol.

Sign in / Sign up

Export Citation Format

Share Document