Coordination compounds of substituted 1,10-Phenanthrolines and related dipyridyls. VIII. Complexes of silver and 2,9-Dimethyl-1,10-phenanthroline

1965 ◽  
Vol 18 (9) ◽  
pp. 1345 ◽  
Author(s):  
JR Hall ◽  
RA Plowman ◽  
HS Preston
Keyword(s):  
Aqueous Solutions ◽  
Organic Solvents ◽  
Infrared Spectra ◽  
Coordination Compounds ◽  
Molecular Weights ◽  
Low Solubility ◽  
Covalently Bound

Addition of 2,9-dimethyl-1,10-phenanthroline (dmp) in organic solvents to aqueous solutions of silver(1) salts yielded mono complexes represented by AgXdmp, where X = NO3, Cl, Br, I; 2X = SO4, and bis complexes Ag(dmp),Y, where Y = NO3, Cl04. Water of crystallization was present only in the sulphate. The mono complexes were empirically three-coordinate. Low solubility prevented the determination of molecular weights. Infrared spectra indicated that the polyatomic anions were covalently bound. The 1 : 1 electrolyte [Ag(dmp)(py)]ClO4 subsequently prepared seemed to be an example of three-coordination. The bis complexes were 1 : 1 electrolytes in nitrobenzene and were most likely tetrahedral.

Coordination compounds of norbornadiene with silver tetrafluoroborate

1968 ◽  
Vol 46 (2) ◽  
pp. 117-124 ◽  
Author(s):  
Harold W. Quinn
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Infrared Spectra ◽  
Coordination Compounds ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrated Complexes ◽  
Crystalline Complexes Of

Crystalline complexes of norbornadiene with silver tetrafluoroborate have been obtained both from anhydrous and aqueous solution. While both solutions yield complexes of stoichiometry AgBF4•C7H8 and 2AgBF4•3C7H8, those from the aqueous solutions also contain water of crystallization. The infrared spectra show that norbornadiene is similarly complexed in both the anhydrous and hydrated complexes but that the coordination in the 1:1 complex is different from that in the 2:3 complex. The anhydrous and hydrated 1:1 complexes have the same X-ray diffraction powder patterns while those of 2:3 complexes are different.

Determination of activity coefficients of aqueous solutions of urea in the ultracentrifuge

1970 ◽  
Vol 23 (5) ◽  
pp. 915
Author(s):  
EF Woods
Keyword(s):  
Aqueous Solutions ◽  
Activity Coefficients ◽  
Similar Type ◽  
Point Of View ◽  
Published Data ◽  
Molecular Weights ◽  
Equilibrium Sedimentation ◽  
Aqueous Urea ◽  
Determination Of Activity

Apparent molecular weights of aqueous urea solutions have been determined by equilibrium sedimentation over the concentration range 1-9M. At the speeds used in the ultracentrifuge (39460 to 67770 r.p.m.) there was evidence of the effect of pressure on the sedimentation of urea. Apparent molecular weights of urea were therefore calculated at the solution-air meniscus where the solution is at l atm. The derived activity coefficients showed a similar type of oncentration dependence to published data for urea but there were significant quantitative differences. The significance of the results from the point of view of calculating theoretical distributions in the ultracentrifuge is discussed.

Coordination compounds of substituted 1,10-phenanthrolines and related bipyridyls. XI. Physicochemical study of complexes of copper(II) and 2-Methyl-1,10-phenanthroline

1970 ◽  
Vol 23 (4) ◽  
pp. 691 ◽  
Author(s):  
EW Ainscough ◽  
RA Plowman
Keyword(s):  
Organic Solvents ◽  
Infrared Spectra ◽  
Coordination Compounds ◽  
Water Solution ◽  
Sodium Perchlorate ◽  
Copper Nitrate ◽  
Visible Absorption ◽  
Magnetic Susceptibilities ◽  
Excess Copper ◽  
Donor Nitrogen

Solutions of 2-methyl-1,10-phenanthroline (rnep) with excess copper(II) salts in organic solvents yielded complexes of the formula Cu(mep)X2 (X = NO3, Cl, Br, I). These were non-electrolytes in nitrobenzene. When excess rnep was present bis- complexes of the type Cu(mep)2Cl2,6H2O, Cu(mep)2/sub>(NO3)2,H2O, and hydrated forms of the type Cu(mep)2XClO4 (X = Cl, NO3) were obtained. These were 1 : 1 electrolytes in nitrobenzene and the copper(II) ion was at least five-coordinated with the donor nitrogen atoms taking up a flattened tetrahedral arrangement. Hydrated copper(II) perchlorate with rnep in a 1 : 2 or 1 : 1 ratio yielded Cu(mep)2(ClO4)2,2H2O which is a 2 : 1 electrolyte in nitrobenzene. From a water solution of copper nitrate and rnep in the ratio 1 : 3.5, a complex Cu(mep)3(ClO>sub>4)2 precipitated upon the addition of a sodium perchlorate solution. I t was thought previously that this compound did not exist. The magnetic susceptibilities, the conductivities, and the visible, absorption, and infrared spectra of some rnep complexes have been obtained and structures are proposed from this information.

Organic compounds of gallium. III. Reactions of gallium alkoxides with acetylacetone, ethyl acetoacetate, methyl acetoacetate, and methyl salicylate

1969 ◽  
Vol 47 (14) ◽  
pp. 2661-2663 ◽  
Author(s):  
R. C. Mehrotra ◽  
S. R. Bindal
Keyword(s):  
Organic Compounds ◽  
Organic Solvents ◽  
Infrared Spectra ◽  
Ethyl Acetoacetate ◽  
Methyl Salicylate ◽  
Methyl Acetoacetate ◽  
Reduced Pressure ◽  
Molecular Weights ◽  
Molar Ratios ◽  
Derivatives Of

Derivatives of gallium of the type: Ga(i-C3H7O)3−xligx (x = 1, 2, or 3; and H lig = acetylacetone, methyl and ethyl acetoacetate, or methyl salicylate) have been synthesized by reacting gallium alkoxides with ligands in various molar ratios. The compounds are soluble in organic solvents and could be volatilized under reduced pressure. Their molecular weights have been determined ebullioscopically. The infrared spectra of some of the compounds have been studied.

scholarly journals Advances in the Detection of Dithiocarbamate Fungicides: Opportunities for Biosensors

Biosensors ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 12
Author(s):  
Pablo Fanjul-Bolado ◽  
Ronen Fogel ◽  
Janice Limson ◽  
Cristina Purcarea ◽  
Alina Vasilescu
Keyword(s):  
Raman Spectroscopy ◽  
Sample Preparation ◽  
Organic Solvents ◽  
Ornamental Plants ◽  
Fungal Diseases ◽  
Analytical Determination ◽  
Solubility In Water ◽  
Analytical Tools ◽  
Low Solubility

Dithiocarbamate fungicides (DTFs) are widely used to control various fungal diseases in crops and ornamental plants. Maximum residual limits in the order of ppb-ppm are currently imposed by legislation to prevent toxicity problems associated with excessive use of DTFs. The specific analytical determination of DTFs is complicated by their low solubility in water and organic solvents. This review summarizes the current analytical procedures used for the analysis of DTF, including chromatography, spectroscopy, and sensor-based methods and discusses the challenges related to selectivity, sensitivity, and sample preparation. Biosensors based on enzymatic inhibition demonstrated potential as analytical tools for DTFs and warrant further research, considering novel enzymes from extremophilic sources. Meanwhile, Raman spectroscopy and various sensors appear very promising, provided the selectivity issues are solved.

scholarly journals Complexation processes in “PbCl2-N2H4CS” aqueous solutions during deposition of lead sulphide films

2021 ◽  
Vol 23 (4) ◽  
pp. 543-547
Author(s):  
Victor N. Semenov ◽  
Vitaly V. Volkov ◽  
Natalia V. Pereslytskikh
Keyword(s):  
Aqueous Solutions ◽  
Coordination Compounds ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Lead Chloride ◽  
Lead Sulphide ◽  
New Approach ◽  
Complex Forms ◽  
Selection Of

In this study, we proposed a new approach to assessing the processes of complexation in aqueous solutions using the example of the interaction of lead chloride with thiourea. The goal of this study was the investigation of processes of complexation in “PbCl2-N2H4CS” aqueous solutions and determination of the regions of dominance of thiourea coordination compounds, which are precursors during the deposition of lead sulphide films.Based on the diagrams and cross section lines of equal fractions constructed in three-dimensional space, the regions of dominance of all complex forms existing in the studied solution were found. Such a graphic image is the most informative, since it allows selection of the concentration ranges of the predominance of certain coordination compounds, especially thiourea complexes, which are precursors during the deposition of lead sulphide films. It was shown that an increase in the concentration of N2H4CS led to an increase in the total fraction of thiourea complexes: for a twofold excess of N2H4CS its fraction was 0.25, for a threefold excess it was 0.35, for a fourfold excess it was 0.5, for a fivefold excess it was 0.7.

COORDINATION COMPOUNDS OF HYDRAZINE: PART III. THE INTERACTION OF SILICON TETRAFLUORIDE WITH HYDRAZINE

1963 ◽  
Vol 41 (4) ◽  
pp. 876-882 ◽  
Author(s):  
R. C. Aggarwal ◽  
M. Onyszchuk
Keyword(s):  
Hydrogen Chloride ◽  
Organic Solvents ◽  
Infrared Spectra ◽  
Hydrofluoric Acid ◽  
Coordination Compounds ◽  
Boron Trifluoride ◽  
Silicon Tetrafluoride ◽  
Volatile Solid ◽  
Octahedral Structure

Silicon tetrafluoride and hydrazine react in a vacuum to produce a white, non-volatile, solid, 1:2 complex, SiF4.2N2H4. This compound sublimes with decomposition above 200° and is insoluble in common organic solvents. It reacts with (a) 55% hydrofluoric acid, (b) anhydrous hydrogen chloride, (c) ethylenediamine, (d) ammonia, and (e) boron trifluoride, producing: (a) (N2H5+)2SiF62−, (b) N2H5+Cl−, (c) SiF4.NH2(CH2)2NH2, (d) SiF4.2NH3, and (e) BF3.N2H4. A comparison of the infrared spectra of SiF4.2NH3, SiF4.2N2H4, and SiF4.NH2(CH2)2NH2 suggests that all three complexes have cis octahedral structure.

Coordination Compounds of Substituted 1,lO-Phenanthrolines and Related Dipyridyls. IV. Physicochemical Study of Complexes of Copper and 2,9-Dimethyl-1,10-phenanthroline

1963 ◽  
Vol 16 (1) ◽  
pp. 34 ◽  
Author(s):  
JR Hall ◽  
NK Marchant ◽  
RA Plowman
Keyword(s):  
Organic Solvents ◽  
Infrared Spectra ◽  
Copper Atom ◽  
Coordination Compounds ◽  
Magnetic Moments ◽  
Physicochemical Study ◽  
Magnetic Susceptibilities ◽  
Donor Nitrogen ◽  
Substituted 1

The magnetic susceptibilities, conductivities, and infrared spectra of some complexes of copper and 2,9-dimethyl-1,10-phenanthroline (dmp) have been obtained. The magnetic moments of the copper(II) compounds lie in the range 1.9 to 2.0 B.M. Complexes of formula CudmpX2, where X = NO3, Cl, and Br, are nonelectrolytes in nitrobenzene. The substances Cu(dmp)2X2H2O and hydrated forms of the compounds Cu(dmp)2XClO4, where X = NO3, Cl, and Br behave as 1 : 1 electrolytes. The copper(II) ion in the bis complexes is at least five-coordinate and it is proposed that the donor nitrogen atoms take up a flattened tetrahedral arrangement. The complexes of formula Cu(dmp)2X, where X = NO3, ClO4, Cl, Br. I, and I3 are diamagnetic solids, 1 : 1 electrolytes in nitrobenzene, and are expected to have a tetrahedral arrangement of the four donor nitrogen atoms about the copper atom. The mono complexes CudmpX, where X = Cl, Br, and I are diamagnetic, practically insoluble in organic solvents, and probably dimeric with a tetrahedral arrangement of the ligand donor atoms.

Coordination Compounds of Substituted 1,10-Phenanthrolines and Related Dipyridyls. II. Complexes of Iron and 2,9-Dimethyl-1,10-phenanthroline

1962 ◽  
Vol 15 (2) ◽  
pp. 235 ◽  
Author(s):  
DB Fox ◽  
JR Hall ◽  
RA Plowman
Keyword(s):  
Solid State ◽  
General Formula ◽  
Infrared Spectra ◽  
Coordination Compounds ◽  
Magnetic Moments ◽  
Tetrahedral Complexes ◽  
Covalently Bound

A number of mono and bis(che1ate) complexes of iron(II) and 2,9-dimethyl-1,10-phenanthroline (dmp) have been isolated. The mono complexes are of general formula FedmpX2, where X=Cl, Br, I ; 2X=SO4. They are yellow to brown in colour except for the sulphato complex, which is pink. Conductivity and cryoscopic measurements indicate that the halogeno compounds are nonelectrolytes and monomeric. The magnetic moments range from 5.1 to 5.4 B.M. The evidence points to these compounds being four-coordinate tetrahedral complexes. The bis(che1ate)complexes are Fe(dmp)2(NO3)2(H2O)2 and Fe(dmp)2(NO3)(ClO4)(H2O)2, both yellow crystalline substances. They are 1 : 1 electrolytes in nitrobenzene and nitromethane. The magnetic moments are 5.2 B.M. for the dinitrate and 5.05 B.M. for the nitrate-perchlorate. According to their infrared spectra, each compound in the solid state appears to contain covalently bound nitrate and is most probably six-coordinate.

Aluminium (III) Derivatives of Schiff bases Derived from o-Hydroxyacetophenone and Hydroxyalkylamines

1973 ◽  
Vol 28 (1-2) ◽  
pp. 63-68 ◽  
Author(s):  
J. P. Tandon ◽  
R. N. Prasad
Keyword(s):  
Schiff Base ◽  
Schiff Bases ◽  
Infrared Spectra ◽  
Aluminium Isopropoxide ◽  
Molecular Weights ◽  
Schiff Base Derivatives ◽  
Derivatives Of

The 1 : 1 and 2 : 3 interactions of aluminium isopropoxide with bifunctional tridentate Schiff bases, derived by the condensation of o-hydroxyacetophenone with hydroxyalkylamines [such as 2-hydroxyethylamine, 2-hydroxy-1-propylamine, 1-hydroxy-2-methyl-2-propylamine and 1-hydroxy-2-butylamine] have been investigated. The resulting derivatives of the types, Al(OPrt)(SB) and Al2(SB)3 (where SB2- is the anion of the corresponding Schiff base, SBH2) have been isolated in almost quantitative yields. The ebullioscopic determination of molecular weights in benzene has shown the isopropoxy derivatives to be dimers, whereas the dialuminium-tris-Schiff base derivatives to be monomers. The infrared spectra of these compounds have been recorded and plausible structures indicated.

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