Coordination compounds of substituted 1,10-Phenanthrolines and related dipyridyls. VI. Complexes of copper(II) and 4,6,4',6'-Tetramethyl-2,2'-bipyridine

1965 ◽  
Vol 18 (9) ◽  
pp. 1331 ◽  
Author(s):  
JR Hall ◽  
MR Litzow ◽  
RA Plowman
Keyword(s):  
Molecular Weight ◽  
Coordination Compounds ◽  
Magnetic Moments ◽  
Spectral Measurements

The following complexes of copper(II) and 4,6,4',6'-tetramethyl-2,2'-bipyridine (tmb) have been prepared: CuX2tmb, where X = NO3,Cl,Br, and �SO4; Cu(tmb)2X2, nH2O, where X = NO3 (n = 1) and ClO4, (n = 0, 1, and 2); and Cu(tmb)2X(ClO4), nH2O, where X = NO3 (lz = 1) and Cl (n = 0). The magnetic moments of the compounds range from 1.89 to 2.05 B.M. The results of conductivity, molecular weight, and spectral measurements suggest the occurrence of four-, five-, and six-coordinate copper(II).

Coordination Compounds of Some 3d-Transition Metal Ions with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)- thiosemicarbazide

2008 ◽  
Vol 59 (7) ◽  
Author(s):  
Madalina Angelusiu ◽  
Maria Negoiu ◽  
Stefania-Felicia Barbuceanu ◽  
Tudor Rosu
Keyword(s):  
Coordination Compounds ◽  
Magnetic Moments ◽  
Thermo Gravimetric Analysis ◽  
Electronic Spectroscopy ◽  
Transition Metal Ions ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
New Compounds

The paper presents the synthesis and characterization of Cu(II), Co(II), Ni(II), Cd(II), Zn(II) and Hg(II) complexes with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)-thiosemicarbazide. The new compounds were characterized by IR, EPR, electronic spectroscopy, magnetic moments, thermo-gravimetric analysis and elemental analysis.

Phosphinohydrazines. Part IV. Coordination compounds of N,N-dimethyl,N′-diphenylphosphinohydrazine and N,N-dimethyl-N′-diphenylthiophosphinatohydrazine

1970 ◽  
Vol 48 (3) ◽  
pp. 401-404 ◽  
Author(s):  
E. W. Ainscough ◽  
L. K. Peterson ◽  
D. E. Sabourin
Keyword(s):  
Molecular Weight ◽  
Nuclear Magnetic Resonance ◽  
Coordination Compounds ◽  
Donor Site ◽  
Membered Ring ◽  
Monomeric Form ◽  
Coordinate Structure ◽  
Polar Solvents ◽  
Uncertain Structure ◽  
Ring Structures

A study of complexes of (a) N,N-dimethyl,N′-diphenylphosphinohydrazine, DPH, viz., Pd(DPH)Cl2, Pd(DPH)2Cl2, [Pd(DPH)2Cl]ClO4, Pt(DPH)2Cl2, Pt(DPH)Cl4, Hg(DPH)Cl2; (b) N,N-dimethyl,N´-diphenylthiophosphinatohydrazine, DPS, viz., Pd(DPS)Cl2, Pt(DPS)Cl4, Ag(DPS)NO3, Zn(DPS)Cl2, Cd(DPS)Cl2, and Hg(DPS)Cl2, and (c) N,N-dimethylhydrazine, DMH, viz., Zn(DMH)2Cl2 and Cd(DMH)Cl2, has been carried out using conductivity, molecular weight, infrared, and nuclear magnetic resonance measurements. DPH functions mostly as a unidentate ligand, with the phosphorus atom as the preferred donor site. Thus Pd(DPH)Cl2 is a chlorobridged dimer in solution in weakly polar solvents, while the monomeric form in polar solvents is of uncertain structure. A trans, four-coordinate structure is consistent for Pd(DPH)2Cl2. For [Pd(DPH)2Cl]ClO4, however, one DPH ligand is chelating through the phosphorus and terminal nitrogen atoms, while the second ligand is unidentate; the compound is a monomeric uni–univalent electrolyte in nitrobenzene. The ligand DPS appears to chelate via the sulfur and central nitrogen atoms, giving four-membered ring structures; a cis configuration is suggested for Pd(DPS)Cl2. Zn(DMH)2Cl2 is monomeric in solution, with the Me2N group coordinated to the metal.

Structure of dimeric monoisopropoxydicaprolactamoalane and diisopropoxymonocaprolactamoalane

1980 ◽  
Vol 45 (5) ◽  
pp. 1336-1342 ◽  
Author(s):  
Otomar Kříž ◽  
Bohuslav Čásenský ◽  
Jiří Macháček
Keyword(s):  
Molecular Weight ◽  
Spectral Measurements ◽  
Aluminium Isopropoxide ◽  
Bridge Formation ◽  
H Nmr ◽  
Oxygen Atoms

Molecular weight and 1H-NMR and IR spectral measurements evidence that in dimeric aluminium isopropoxide in which one or two isopropoxyls have been replaced by caprolactam ligand, only the oxygen atoms of the isopropoxyl take part in the bridge formation between the two aluminium atoms.

The anomalous paramagnetism of iron(III) NN-dialkyldithiocarbamates

1964 ◽  
Vol 17 (3) ◽  
pp. 294 ◽  
Author(s):  
AH White ◽  
R Roper ◽  
E Kokot ◽  
H Waterman ◽  
RL Martin
Keyword(s):  
Molecular Weight ◽  
Thermal Equilibrium ◽  
Room Temperature ◽  
Chemical Nature ◽  
Magnetic Moments ◽  
Chloroform Solution ◽  
Exchange Interactions ◽  
Magnetic Behaviour ◽  
Antiferromagnetic Exchange ◽  
Molecular Type

The magnetic moments of a series of 19 NN-disubstituted dithiocarbamates of iron(III), [Fe(S2C.NR?R")3], are anomalous in that their behaviour is neither "high-" nor "low-spin". Values of μeff. at room temperature lie between 2.62 and 5.83 B.M., the datum for each compound depending on the chemical nature of the substituents R' and R". This anomalous situation persists in benzene or chloroform solution. Cryoscopic and ebullioscopic molecular weight determinations establish that all the compounds are monomeric, which excludes the possibility that the magnetic behaviour arises from the presence of antiferromagnetic exchange interactions of either the inter- or intra-molecular type. These observations strongly support the early and generally overlooked work of Cambi who in 1932 proposed a thermal equilibrium between "magnetic isomers" of spins S = � and S = 5/2 to account for the origin of the magnetic anomaly.

Physicochemical studies on the aggregation of copper(II) and titanium(III) dialkyl phosphates

1975 ◽  
Vol 28 (6) ◽  
pp. 1217 ◽  
Author(s):  
DJ Cookson ◽  
RF Wakefield ◽  
TD Smith ◽  
JR Pilbrow
Keyword(s):  
Molecular Weight ◽  
Magnetic Susceptibility ◽  
Triplet State ◽  
Exchange Coupling ◽  
Structural Parameters ◽  
Spectral Measurements ◽  
Physicochemical Studies ◽  
Infrared Spectral ◽  
Strong Exchange ◽  
Phosphoric Acids

Titanium(III) and copper(II) salts of various dialkyl phosphoric acids have been prepared. Molecular weight measurements on the copper(II) dialkyl phosphates show that they are monomeric in ethanol but aggregate to dimeric forms in chloroform, and to trimeric and tetrameric forms in dichloro- methane, while copper(II) di(2- ethylhexyl) phosphate reaches a molecular weight corresponding to a pentamer in n-hexane. Magnetic susceptibility measurements indicate the absence of strong exchange coupling in the copper(II) dialkyl phosphates. E.s.r. measurements have been made on the titanium(III) dialkyl phosphates doped into the corresponding indium(III) dialkyl phosphates. Similar measurements have been made on the copper(II) dialkyl phosphates doped into the corresponding cadmium dialkyl phosphates. E.s.r. measurements have been carried out on chloroform and dimethylformamide solutions of the copper(II) dialkyl phosphates and the triplet state spectra observed at 77 K used to extract the magnetic and structural parameters associated with the dimeric forms of the copper(II) dialkyl phosphates. Infrared spectral measurements have been made on the titanium(III), indium(III), copper(II) and cadmium(II) dialkyl phosphates and the major peaks assigned.

EXTRACTION AND CHARACTERIZATION OF HUMUS WITH REFERENCE TO CLAY-ASSOCIATED HUMUS

1974 ◽  
Vol 54 (3) ◽  
pp. 317-323 ◽  
Author(s):  
D. W. ANDERSON ◽  
E. A. PAUL ◽  
R. J. ST. ARNAUD
Keyword(s):  
Molecular Weight ◽  
Humic Acid ◽  
Gel Filtration ◽  
Spectral Measurements ◽  
Ultrasonic Dispersion ◽  
Agar Gel ◽  
Molecular Weights ◽  
Fractionation Method ◽  
C And N

An extraction-fractionation method was developed with which it is possible to isolate 60–67% of the humus of Chernozemic and Luvisolic soils. Two humic acid fractions were obtained: (1) a conventional alkali-pyrophosphate extractable HA-A; (2) a clay-associated HA-B fraction isolated after ultrasonic dispersion, in water, of the residue of the alkali-pyrophosphate extraction. As compared to the HA-A, the HA-B fractions had lower C contents but greater N contents, narrower C:H ratios, higher molecular weights, and less resistance to hydrolysis in 6 N HCl. It was concluded that the HA-B is a weakly humified, potentially labile humic constituent stabilized by adsorption to clay. Spectral measurements on low-ash (< 2%) humic acids showed a positive correlation between extinction coefficient at 280 nm (E280) and C:H ratio, and negative correlations between E280 and percent of hydrolyzable C and N. The E4:E6 ratio was related to molecular weight, as determined by agar gel filtration, increasing with decrease in molecular weight.

scholarly journals Antibacterial, Cytotoxic Studies and Characterization of Some Newly Synthesized SymmetricalN3,N3′-Bis(disubstituted)isophthalyl-bis(thioureas) and Their Cu(II) and Ni(II) Complexes

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Muhammad Jamil ◽  
Muhammad Zubair ◽  
Muhammad Asim Farid ◽  
Umer Rashid ◽  
Nasir Rasool ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Nmr Spectroscopy ◽  
Magnetic Moments ◽  
Cytotoxic Activities ◽  
Spectral Measurements ◽  
Neutral Complex ◽  
H Nmr ◽  
Cytotoxic Studies ◽  
C Nmr

A series of some novelN3,N3′-bis(disubstituted)isophthalyl-bis(thioureas) compounds with general formula [C6H4·{CONHCSNHR}2], where R = 2-ClC6H4S (L1), 3,5-(Cl)2C6H3(L2), 2,4-(Cl)2C6H3(L3), 2,5-(Cl)2C6H3(L4), and 2-NH2C6H4(L5), and their Cu(II) and Ni(II) complexes (C1–C10) have been synthesized. These compounds (L1–L5) and their metal(II) complexes (C1–C10) have been characterized by elemental analysis, infrared spectroscopy,1H NMR and13C NMR spectroscopy, magnetic moments, and electronic spectral measurements. The ligands are coordinated to metal atom in a bidentate pattern producing a neutral complex of the type [ML]2. These compounds (L1–L5) and their metal(II) complexes (C1–C10) were also screened for their antibacterial and cytotoxic activities.

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