Chemistry & Earth Sciences: المرسلات الحديثة
السجلات المعروضة 21 -- 40 من 601
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Synthesis, spectroscopic and structural characterization of charge transfer complexes of 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8,8,8]hexacosane with iodine, TCNE and TCNQ
( Elsevier , 2012 , Article)The charge transfer interaction of the interesting mixed nitrogen–oxygen donor 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8,8,8]hexacosane (HODABCHC) with σ-electron acceptor iodine and π-acceptors tetracyanoethylene (TCNE) ... -
Spectoscopic and structural studies on charge-transfer complexes of lanthanum(III)acetylacetonate with σ-acceptor iodine and π-acceptor DDQ
( Elsevier , 2011 , Article)The interaction of the donor La(III)acetylacetonate, [La(acac)3], with iodine as a r-acceptor and with 2,3- dichloro-5,6 dicyano-1,4-benzoquinone, (DDQ) as a p-acceptor have been studied in the solvents CH2Cl2, CHCl3 and ... -
Synthesis, spectroscopic and thermal studies of vanadyl-N,N'-o- phenylenebis(salicylideneiminato) complexes
( Polskie Towarzystwo Chemiczne , 2004 , Article)Two new complexes [V(O)(sal-o-phdn)(H2O)] and [V(O)(sal-o-phdn)(C2H5OH)] (sal-o-phdn = N,N′-o-phenylenebis(salicylideneiminato)) have been synthesized and characterized by elemental and thermal analysis and electronic, ... -
Synthesis and characterization of nickel(II), cobalt(III) and iron(III) complexes of the schiff base 1-(2,3-dihydroxybenzylidene)thiosemicarbazone
( Polskie Towarzystwo Chemiczne , 2004 , Article)Ni(II), Co(III) and Fe(III) complexes of the Schiff base 1-(2,3-dihydroxybenzylidene)thiosemicarbazone (Hdhbtsc) have been prepared and characterized by elemental analysis, infrared spectra, thermal analysis, molar ... -
Far-infrared and Raman spectroscopic studies of polyiodides
( American Chemical Society , 1986 , Article)The far-infrared and Raman spectra of (CH3)4NI5, (TMA.H2O)10HI5 (TMA = trimesic acid), (phen)2HI5 (phen = phenacetin), (CH3)4NBrI4, (C2H5)4NI7, and (CH3)4NI9 have been recorded and analyzed. The first three compounds contain ... -
Spectroscopic studies of nickel and iron clusters at 12 K
( AIP Publishing , 1987 , Article)The electronic and far‐infrared spectra of nickel and iron clusters trapped in argon matrices at 12 K are reported. The ν3 antisymmetric stretching frequencies for Ni3 and Fe3 were observed for the first time at 198 and ... -
Infrared and Raman studies of [UO2(salen)(L)] (L=H2O and CH3OH)
( Elsevier , 1988 , Article)The infrared and Raman spectra of [UO2(salen)(H2O)] and [UO2(salen)(CH3OH)] (salen=N,N′-ethylenebis(salicylideneimine) have been recorded. Assignments for the fundamental vibrations are proposed on the basis of C2v symmetry ... -
Electronic, infrared, and Raman spectral studies of the reaction of iodine with 4-aminopyridine
( Elsevier , 2005 , Article)The reaction of iodine as an electron acceptor with the base 4-aminopyridine (4APY) has been investigated spectrophotometrically in chloroform at room temperature. The electronic absorptions, infrared and Raman spectra, ... -
Spectroscopic studies on the uranyl-schiff base solid complex (N,N'-p-phenylenebis(salicylideneiminato)UO2)
( Elsevier , 1992 , Article)The dioxouranium(VI)-Schiff base complex (N,N'-p-phenylenebis(salicylideneiminato)UO2); (UO2(sal-p-phdn)) was prepared. Its resonance Raman, infrared and electronic spectra were obtained and assigned on the basis of C2v ... -
Vibrational analysis of the (VO(O2)2NH3)- ion
( Elsevier , 1990 , Article)The infrared spectra of the solid complex NH4 (VO(O2)2NH3) were obtained. Due to the complicated structure of the diperoxo (VO(O2)2NH3)− ion, normal coordinate analysis was introduced in order to make quantitative assignments ... -
Electronic spectral studies and solvent effects on the reaction of iodine with 1,4,8,11-tetraazacyclotetradecane
( Elsevier , 1988 , Article)The reaction between iodine and 1,4,8,11-tetraazacyclotetradecane (TACTD) is studied photometrically in various solvents like CCl4, CHCl3, CH2Cl2 and 1,2-dichloroethane. The results reveal that in each solvent the (TACTD):I2 ... -
Synthesis and Spectroscopic Studies of the Charge‐Transfer Complexes of 2,3‐Diaminopyridine and π‐Electron Acceptors
( Taylor and Francis Ltd. , 2004 , Article)The spectrophotometric properties of the charge transfer (CT)‐complexes formed between 2,3‐diaminopyridine (DAPY) and π‐acceptors tetrachloro‐p‐benzoquinone (chloranil) and tetracyanoethylene (TCNE) have been studied in ... -
Preparation and infrared spectra of (Cu(O)(H2O)3) and (Cu2(O) (C1)2(H2O)2) complexes formed in the reactions of Cu(II) salts with urea
( Elsevier , 1989 , Article)The preparation and characterization of the new solid complexes (Cu(O)(H2O)3) and (Cu2(O)(Cl)2(H2O)2) formed in the reaction of urea with CuSO4 · 5H2O and CuCl2 · 2H2O, respectively, in aqueous media at ~75°C are reported. ... -
Resonance Raman and far infrared spectroscopic studies of triiodide complexes formed in the reaction of iodine with some polycyclic amines
( Elsevier , 1989 , Article)The solid charge transfer complexes formed in the reaction of iodine with the polycyclic amines 1,4,8,12-tetraazacyclopentadecane (TACPD) and meso-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane (HMTACTD) have ... -
Synthesis and infrared spectra of alkaline earth metal carbonates formed by the reaction of metal salts with urea at high temperature
( Indian Academy of Sciences , 2004 , Article)The metal carbonate, MCO3 (M = Ca, Sr and Ba), was synthesized by a novel method of reacting aqueous solution of each of Ca2+, Sr2+ and Ba2+ salts with urea at high temperature, ∼ 80°C. The reaction products were characterized ... -
Synthesis and spectroscopic studies of metal complexes formed in the reaction of metal ions with urea at high temperature
( Korean Chemical Society , 2007 , Article)Urea reacts with PtCl2, H2[PtCl6]·6H2O, H2[IrCl6] and Ni(CH3CO2)2 in aqueous solution at high temperature (60-80 °C) yielding [PtCl2(Urea)]·2H2O (1), (NH4)2[PtCl6] (2), (NH4)2[IrCl6]·H2O (3) and [Ni2(OH)2(NCO)2(H2O)2] (4) ... -
Resonance Raman studies of the peroxotitanate(IV) complexes K2(Ti(O2)(SO4)2).5H2O and K2(Ti(O2)(C2O4)2).3H2O
( Elsevier , 1986 , Article)The resonance Raman spectra of K2(Ti(O2)(SO4)2)·5H2O and K2(Ti(O2)(C2O4)2)·3H2O are recorded. The results are consistent with the triangular structure of the peroxotitanium unit, Ti(O2), with C2ν symmetry. The ν(OO), ... -
Resonance Raman and far-infrared studies of charge-transfer complexes of iodine
( John Wiley and Sons Inc , 1986 , Article)The reactions of I2 with phenazine (PH), acridine (AC) and hexamethylenetetramine (HMTA) have been investigated by resonance Raman and far-infrared spectroscopy. The results indicate that the species (PH)2I+I3−, (AC)2I+I3− ... -
Vibrational analysis of the trigonal bipyramidal NbCl5 and NbBr5 molecules
( Elsevier , 1986 , Article)Vibrational normal coordinate analysis has been made for NbCl5 and NbBr5 molecules with D3h symmetry and using Wilson's GF matrix method. The observed frequencies are quantitatively assigned on the basis of the calculated ... -
Spectroscopic studies on the reaction of iodine with the mixed oxygen-nitrogen cyclic base 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8,8,8] hexacosane
( Chemical Publishing Co. , 2005 , Article)The interaction of the mixed oxygen-nitrogen cyclic base, 4,7,13,16,21,24-hexaoxa-1,10- diazabicyclo[8,8,8] hexacosane (HODABCHC) with iodine as a s-acceptor has been studied spectrophotometrically at room temperature in ...
