Nature of the Coordination Bond in Metal Complexes of Substituted Pyridine Derivatives. VI. Electronic Spectra of Some Complexes of Copper(II)

1971 ◽  
Vol 49 (1) ◽  
pp. 102-104 ◽  
Author(s):  
Miss M. Tong ◽  
D. G. Brewer
Keyword(s):  
Metal Complexes ◽  
Electronic Spectra ◽  
Spectroscopic Data ◽  
Coordination Bond ◽  
Pyridine Derivatives ◽  
Pyridine Complexes ◽  
Infrared Measurements

The electronic spectra of some substituted pyridine complexes of copper(II) have been studied. The effects of bonding on the spectroscopic data are discussed, and compared with the Rπ values determined from infrared measurements.

The nature of the coordination bond in metal complexes of substituted pyridine derivatives. III. 4-Methylpyridine complexes of some divalent transition metal ions

1968 ◽  
Vol 46 (20) ◽  
pp. 3137-3141 ◽  
Author(s):  
D. G. Brewer ◽  
P. T. T. Wong ◽  
M. C. Sears
Keyword(s):  
Infrared Spectroscopy ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Ions ◽  
Coordination Bond ◽  
Pyridine Derivatives ◽  
Normal Coordinate ◽  
Substituted Pyridines ◽  
Solid Complexes ◽  
Nitrogen Bond

Previous papers in this series investigated the nature of the coordination bond in copper(II) and zinc(II) complexes of 4-substituted pyridines by infrared spectroscopy. In this paper, the investigation has been extended to complexes of 4-methylpyridine with cobalt(II), manganese(II), and nickel(II). The geometry of the solid complexes is assigned, and the force constants associated with the metal–nitrogen bond were calculated from a normal coordinate analysis. The validity of the previously introduced Rπ parameter in these systems is discussed.

The nature of the coordination bond in metal complexes of substituted pyridine derivatives. V. 4-Methylpyridine complexes of Zn(II), Cd(II), and Hg(II)

1970 ◽  
Vol 48 (24) ◽  
pp. 3786-3789 ◽  
Author(s):  
M. C. Sears ◽  
W. V. F. Brooks ◽  
D. G. Brewer
Keyword(s):  
Force Field ◽  
Metal Complexes ◽  
Field Model ◽  
Coordination Bond ◽  
Pyridine Derivatives ◽  
Divalent Ions ◽  
Normal Coordinate ◽  
Valence Force ◽  
Valence Force Field ◽  
Zinc Cadmium

In this paper, an attempt is made to interpret the π-bonding between a 4-methylpyridine ligand and the divalent ions of zinc, cadmium, and mercury, using the previously introduced Rπ parameter. To do this, the ν12 mode in the complexes is assigned and confirmed by a normal coordinate analysis based on a valence force field model.

Nature of the coordination bond in metal complexes of substituted pyridine derivatives. I. The substituent effect on the coordination bond

1968 ◽  
Vol 46 (2) ◽  
pp. 131-138 ◽  
Author(s):  
Patrick T. T. Wong ◽  
D. G. Brewer
Keyword(s):  
Free Energy ◽  
Bond Strength ◽  
Metal Complexes ◽  
Infrared Spectra ◽  
Substituent Effect ◽  
Coordination Bond ◽  
Spectroscopic Methods ◽  
Pyridine Derivatives ◽  
Coordination Center ◽  
Substituted Pyridines

The nature of the coordination bond in some metal complexes of 4-substituted pyridines has been investigated by thermodynamic and infrared spectroscopic methods. The effects of the substituents upon the coordination bond strength in the copper(II) complexes of these ligands have been found by direct measurement of the heats of coordination. These effects have been further described by the substituent effect upon the change in free energy of the coordination center in the ligands. A new parameter, Rπ, measuring the relative π bonding in the complexes of 4-substituted pyridines has been introduced. For this purpose a series of complexes of the types [M(4—R—C5H4N)2Cl2] and [(4—R—C5H4N)•HCl] (R = CH3, CH2OH, H, COCH3, CONH2, COOCH3, CN; M = Cu(II), Zn(II)) has been isolated, and the infrared spectra of these complexes and the free ligands have been examined.

scholarly journals Synthesis characterization of Cr(III), Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) complexes of 2,12-dimethyl-3-13-di-n-propyl-l,4,ll,14-tetraazacycloeicosa-1,13,l1,13-tetraene

2002 ◽  
Vol 67 (12) ◽  
pp. 825-832 ◽  
Author(s):  
Raghu Prasad ◽  
Mala Mathur
Keyword(s):  
Metal Ions ◽  
Metal Complexes ◽  
Electronic Spectra ◽  
Magnetic Measurements ◽  
Elemental Analyses

Metal complexes of a 20-membered tetraazamacrocycle 2,12-dimethyl-3,13-di-n-propyl 1,4,11,14-tetraazacycloeicosa-1,3,11,13-tetraene(L) of the type [MLX2]X(M=Cr(III), Fe(III); X=NO3)[CoLNO3]NO3, [NiL(NO3)2], [CuL]Cl2 and [ZnLCl2]have been prepared by 2+2 cyclocondensation of 2,3-hexanedione with 1,6-diaminohexane in the presence of metal ions as templates. These complexes were characterized by elemental analyses, conductances, IR and electronic spectra and magnetic measurements.

scholarly journals Determination of the Ratios of Ligands to Metal Ion of some Metal Complexes of Triazoles by Using Eleetronie Speetra in Organie Solvents

2004 ◽  
Vol 1 (1) ◽  
pp. 110-115
Author(s):  
Baghdad Science Journal
Keyword(s):  
Solid State ◽  
Metal Complexes ◽  
Electronic Spectra ◽  
Metal Ion ◽  
The Other ◽  
Molar Ratio ◽  
Other Hand

We found that 4,5- diphenyl- 3(2- propynyl) thio- 1??-triazole [1? forms a complex with Pd (11) ion of ratio 1:1 which absorbs light in CH2CI2 at 400 nm, and 4,5- diphenyl- 3(2- propenyl) thio- 1,2,4- triazole [II] forms complexes with Pd (II) ion of ratio 1:1 which absorbs light at 390 nm, and of ratio 2:1 which absorbs light at 435 nm. On the other hand, we found that the new derivative 4- phenyl- 5( p- amino phenyl) -3- mercapto- 1,2,4- triazole ?111? forms complexes with Cu (II) ion of the ratio 1:1 which absorbs light at 380 nm, with Ni (II) ion of the ratio 3:1 which absorbs light at 358 nm; and with Co (11) ion of the ratio 3.2:1 which absorbs light at 588 nm. The ratio of the complexes were determined by measuring the electronic spectra of the complexes in CH2G2 and (CH^NCHO at different concentrations ofthe ligands and f?xed ' •' of the metal ion in every case, then applying the molar ratio plots on the data. Our results were confirmed by precipitating most ofthe above complexes in solid state, and then each complex was analyzed elementally.

Synthesis, spectral and electrochemical study of coordination molecules Cu4OX6L4: 4-cyanopyridine Cu4OBrnCl(6−n)(4-CNpy)4 complexes

2010 ◽  
Vol 64 (3) ◽  
Author(s):  
Gregor Ondrejovič ◽  
Adela Kotočová ◽  
Marian Koman ◽  
Peter Segľa
Keyword(s):  
Cyclic Voltammetry ◽  
Infrared Spectra ◽  
Electronic Spectra ◽  
Pyridine Ring ◽  
Pyridine Complexes ◽  
Half Wave ◽  
Out Of Plane ◽  
Donor Acceptor ◽  
Back Bonding ◽  
Stretching Vibrations

AbstractNew 4-cyanopyridine halide and mixed-halide Cu4OBrnCl(6−n)(4-CNpy)4 complexes (4-CNpy = 4-cyanopyridine, n = 0–6) were synthesised, characterised, and studied by infrared spectra, electronic spectra, and cyclic voltammetry. Infrared spectra revealed donor-acceptor vibrational couplings of the Cu4O, Cu-Cl, and Cu-N stretching vibrations with the in-plane and out-of-plane pyridine ring vibrations. The infrared spectra, electronic spectra, and half-wave potentials correspond to a weak donor and a strong acceptor behaviour of the 4-cyanopyridine ligands and to π-back bonding, Cu(II)→pyridine rings. The results were compared with the related pyridine and 4-substituted pyridine complexes.

scholarly journals Electronic Spectra of Trivalent Metal Complexes of 3-Phenyl- and 3-Benzyl-2,4-pentanedione

1966 ◽  
Vol 39 (5) ◽  
pp. 901-909 ◽  
Author(s):  
Yukito Murakami ◽  
Katsuyuki Nakamura
Keyword(s):  
Metal Complexes ◽  
Electronic Spectra ◽  
Trivalent Metal

scholarly journals Transition metal complexes with thiosemicarbazide-based ligands. Part 60. Reactions of copper(II) bromide with pyridoxal S-methylisothiosemicarbazone (PLITSC). Crystal structure of [Cu(PLITSC−H)H2O]Br•H2O

2014 ◽  
Vol 79 (3) ◽  
pp. 291-302 ◽  
Author(s):  
Vukadin Leovac ◽  
Ljiljana Vojinovic-Jesic ◽  
Sonja Ivkovic ◽  
Marko Rodic ◽  
Ljiljana Jovanovic ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Elemental Analysis ◽  
Structural Characterization ◽  
Electronic Spectra ◽  
Square Planar

The synthesis and structural characterization of a square-planar copper(II) complex with pyridoxal S-methylisothiosemicarbazone (PLITSC) of the formula [Cu(PLITSC?H)H2O]Br?H2O (1) as the first Cu(II) complex with monoanionic form of this ligand were described. Complex 1 together with two previously synthesized complexes [Cu(PLITSC)Br2] (2) and [Cu(PLITSC)Br(MeOH)]Br (3) were characterized by elemental analysis, IR and electronic spectra and also by the methods of thermal analysis, conductometry and magnetochemistry.

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