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1.
J. Radwańska-Doczekalska D. Czakis-Sulikowska M. Markiewicz 《Journal of Thermal Analysis and Calorimetry》1997,48(4):865-875
2,4-Bipyridyl (2,4-bipy orL) complexes with cobalt(II), nickel(II) and copper(II) of the formulae M(2,4-bipy)2(CH3COO)2·2H2O (M(II) = Co, Ni, Cu), Co(2,4-bipy)2SO4·3H2O or Ni(2,4-bipy)2SO4·4H2O have been prepared and their IR and electronic (VIS) spectra are discussed. The thermal behaviour of the obtained compounds has also been studied. The intermediate products of decomposition at different temperatures have been characterized by chemical analysis and X-ray diffraction.We thank dr. A. Malinowska for performing VIS spectra. This work was supported by the KBN project No. PB 0636/P3/93/04. 相似文献
2.
Sevim Akyüz Ayşen Erbolukbas Ozel J. Eric D. Davies Meriç Bakiler 《Journal of inclusion phenomena and macrocyclic chemistry》1996,26(1-3):103-109
The IR and Raman spectra of Cd(2,2-bipy)Ni(CN)4 and Ni(2,2-bipy)3Ni(CN)4·6H2O.0.5 (2,2-bipy) complexes are reported. The spectral results indicate the existence of structure spectra correlations.Presented at the Sixth International Seminar on Inclusion Compounds, Istanbul, Turkey, 27–31 August, 1995. 相似文献
3.
Sudhir Burman Dixit N. Sathyanarayana Augoustinos Anagnostopoulos 《Transition Metal Chemistry》1979,4(6):364-367
Summary 4,4-Bipyridyl (4,4-bipy) complexes of ferrous salts of the Fe(4,4-bipy)x(anion)y type (where x or y=1 or 2) and of ferric salts of the Fe(4,4-bipy)m(anion)n type (where m=1 or 2 and n=3) have been synthesised. Elemental analyses, i.r. and electronic spectra, magnetic and Mössbauer studies have been performed to characterize the complexes. 4,4-Bipy and some anions are inferred to act as bridging ligands. The magnetic moments, electronic and Mössbauer spectra suggest that the complexes are of high spin type with distorted octahedral structures. The value of the isomer shift and quadrupole splitting are discussed in terms of bonding of the ligand and anions. 相似文献
4.
E. Ziegler Heidrun Mittelbach W. Steiger 《Monatshefte für Chemie / Chemical Monthly》1970,101(4):1059-1067
Zusammenfassung Brombernsteinsäure reagiert mit Benzalanilin inDMF/POCl3 zum 2,2-Diphenyl-4,4-biisochinolin-3,3 (2H, 2H)-dion (1a). Brombernsteinsäuredichlorid gibt mit dem Anil vorerst ein Addukt, welches beim Erhitzen in Nitrobenzol unter Abgabe von H2O, HBr und H2 ebenfalls in1 a übergeht. Analog können die Derivate1b-1k hergestellt werden, die in Lösung intensiv fluoreszieren.
J. R. Geigy AG, Basel, zum Patent angemeldet, CH 3-3253 am 3. Februar 1970. 相似文献
Syntheses of heterocycles, CXLVIII: concerning the chemistry of bi-isoquinolones
Bromosuccinic acid reacts with benzylidene aniline inDMF/POCl3 yielding 2.2-diphenyl-4.4-biisoquinoline-3.3 (2H, 2H)-dione (1a). Bromosuccinyldichloride and benzylidene aniline give firstly an adduct, which loses H2O, HBr and H2 to yield1 a, if heated in nitrobenzene. The derivatives1b-1k are obtained in a similar way and show in solution an intensive fluorescence.
J. R. Geigy AG, Basel, zum Patent angemeldet, CH 3-3253 am 3. Februar 1970. 相似文献
5.
Larry S. Gelfand Louis L. Pytlewski Chester M. Mikulski Anthony N. Speca Nicholas M. Karayannis 《Transition Metal Chemistry》1979,4(6):354-360
Summary During interaction of ethanol-triethyl orthoformate solutions of nicotinic or isonicotinic acidN-oxides (LH and LH, respectively) with MCl2 (M = Mn, Co, Ni), only one true adduct, of the Ni(LH)3Cl2 · 2 H2O type was obtained. In all other cases, partial substitution of Cl– ions with the corresponding pyridinecarboxylateN-oxide anionic ligands (L or L) occurred. As a result, mixed ligands (LH-L or LH-L) were precipitated, as follows: Mn(LH)2LCl, Co(LH)LCl, Mn(LH)LCl · 4H2O, Co(LH)LCl · H2O and Ni2(LH)LCl3 · 6 H2O. The insolubility of the new complexes in all common solvents, combined with the pronounced tendency of the 3- and 4-pyridinecarboxylates and theirN-oxides to function as bidentate bridging ligands, favours bi- or polynuclear structures. Spectral data suggest that Ni(LH)3Cl2 · 2 H2O is hexacoordinate, and the rest of the new complexes pentacoordinate. Bi- or polynuclear structures, involving double -M-(L)2-M- or-M-(LH)2-M- and single -M-(L)-M- or-M(L)-M-(LH)-M- bridges, were proposed on the basis of the overall evidence; additional features of the proposed structural types are: exclusively coordinated chloro ligands, in all cases; aqua ligands [Co(LH)LCl · H2O]; lattice water [Ni(LH)2Cl2 · 2H2O]; both lattice and coordinated H2O [Mn(LH)LCl · 4H2O, and Ni2(LH)LCl3 · 6H2O]; and, with the exception of Ni2(LH)LCl3 · 6 H2O, terminal, unidentate, N-O oxygen-bonded LH or LH ligands.Abstracted in part from the Ph.D. Thesis (in preparation) of L. S. Gelfand, Drexel University. 相似文献
6.
Marcella Massacesi Rosalba Pinna Gerolamo Devoto Ermanno Barni Piero Savarino Liliana Strinna Erre 《Transition Metal Chemistry》1984,9(9):351-355
Summary Complexes of general formula MLmCl2 · nH2O, where M=cobalt(II) or nickel(II); L=2-(4-methyl, 2-pyridyl)-benzimidazole (mpbi), 2-(4-methyl, 2-pyridyl)benzothiazole (mpbt), 2-(4-methyl, 2-pyridyl)benzoxazole (mpbo), 2-(4-methyl, 2-quinolyl)benzoxazole (mqbo), or 2-(4-methyl, 8-quinolyl)benzoxazole (mqbo); m=1,2; n=0–3, were prepared and characterized by t.g.a., conductance and magnetic measurements, i.r. and diffuse-reflectance electronic spectra.All the ligands behave as bidentate and coordinate through the pyridine- and isoxazole-nitrogen atoms.The nickel complexes have distorted octahedral or fivecoordinate structures. The cobalt complexes arepseudo-tet- rahedral except Co(mpbo)2Cl2·2H2O where the metal is six-coordinate. 相似文献
7.
Convenient methods for the synthesis of chiral 2,3-seco-2-deoxynucleosides were developed. An isopropylidene protective group was used to block the 3,5-hydroxy groups in 2,3-seco-uridine. Conversion of the hydroxymethyl group to a methyl group was accomplished by chlorination with a mixture of CCl4 and Ph3P with subsequent reduction with n-Bu3SnH. 2,3-seco-2-Deoxyuridine was obtained after deacetonation. The (S) enantiomer was similarly synthesized starting from 1-(-D-arabinofuranosyl)uracil. 3-O-tert-Butyldimethylsilyl-5-O-(p-monomethoxytrityl)-2,3-seco-2-deoxyuridine, which has optically active centers at C(1) and C(4), was also synthesized.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 822–826, June, 1988.The authors thank Professor M. Ya. Karpeiskii for his constant interest in this research. 相似文献
8.
Maria Luisa Moyá Antonio Barrios Maria del Mar Graciani Rafael Jiménez Ernestina Muñoz Francisco Sánchez John Burgess 《Transition Metal Chemistry》1991,16(2):165-168
Summary The kinetics of replacement of 4,4-bipyridine, (4,4-bipy), and 4-cyanopyridine, (4-CNpy), by cyanide in [Fe(CN)5-(4,4-bipy)]3-. at 298 K have been studied in binary aqueous mixtures containing different amounts of t-butanol, methanol, glycerol, ethyleneglycol and sucrose. The plots of logarithms of the limiting rate constantsversus the mole fraction of water are linear over the entire composition range studied, showing the importance of solvation phenomena. A different straight line of log (kL/s–1)versus XH2O is obtained for each mixture, indicating the influence of other solvent parameters on the reaction rate. A multiparameter regression of G
exp
with A (acidity vector), B (basicity vector) and GE is used for both reactions; plots of G
calc
versus G
exp
are linear with slopes of near unity. 相似文献
9.
Marcelo O. Santiago Alzir A. Batista Marcio P. de Araújo Claudio L. Donnici Icaro de S. Moreira Eduardo E. Castellano Javier Ellena Sauli dos Santos Jr Salete L. Queiroz 《Transition Metal Chemistry》2005,30(2):170-175
A series of cis-{RuCl2(PPh3)2[4,4-(X)2-2,2-bipy]} [cis-chlorines; X=-H, -Me, -SMe, and (-Cl,-Me)] complexes have had their structures determined by single crystal X-ray diffraction. The geometry of these complexes, also determined in CH2Cl2 solution by 31P{1H}-n.m.r. spectroscopy, showed that the chemical shifts for the phosphorus atoms are slightly dependent on the pKa of the 4,4-(-X)2-2,2-bipy ligands. 相似文献
10.
Summary The ultraviolet irradiation of air-saturated alcoholic solutions of 3-acetyl-3,4-dihydrocoumarin (1) leads to the formation of 3-acetylcoumarin (2) and 3,3-diacetyl-3,3,4,4-tetrahydro-4,4-biscoumarin (3). The presence of molecular oxygen is an indispensable condition for the occurrence of a photodehydrogenation process, which is quantitatively when effected on silica gel.
Photochemische Dehydrierung von 3-Acetyl-3,4-dihydrocumarin (Kurze Mitt.)
Zusammenfassung Bei UV-Bestrahlung von alkoholischen Lösungen von 3-Acetyl-3,4-dihydrocumarin (1) unter O2 werden 3-Acetylcumarin (2) und 3,3-Diacetyl-3,3,4,4-biscumarin (3) gebildet. Die Anwesenheit von molekularem O2 ist für die Photodehydrierung erforderlich, wobei die Umsetzung an Silikagel quantitativ verläuft.相似文献
11.
Marcella Massacesi Gustavo Ponticelli Gerolamo Devoto Giovanni Micera Paola Piu 《Transition Metal Chemistry》1984,9(9):362-366
Summary Copper(II) complexes CuLCl2, where L=2-(4-methyl-2-pyridyl)benzimidazole(mpbi); 2-(4-methyl-2-pyridyl)benzothiazole(mpbt); 2-(4-methyl-2-pyridyl)benzoxazole (mpbo); 2-(4-methyl-2-quinolyl)benzoxazole (mqbo); 2-(4-methyl8-quinolyl)benzoxazole (mqbo), and Cu(mpbi)2Cl2(H2O) have been synthesized and characterized by conductivity and magnetic measurements as well as by i.r., electronic and e.s.r. spectra. The ligands are bidentate donors through the pyridine and isoxazole nitrogen atoms. The CuLCl2 complexes exhibit spectral properties consistent with CuN2Cl2 chromophores differing in the degree of tetrahedral distortion, which is found to parallel the steric hindrance near the donor sites. Cu(mpbi)2 Cl2(H2O) is five-coordinate. 相似文献
12.
Ananias Sandra R. Mauro Antonio E. Zutin Katia Picchi Cristina M.C. Santos Regina H.A. 《Transition Metal Chemistry》2004,29(3):284-290
The cyanate-bridged cyclopalladated compound [Pd(N,C-dmba)(-NCO)]2
(1)(dmba = PhCH2NMe2) reacts in CH2Cl2 with 2,3-lutidine (2,3-lut), 3,4-lutidine (3,4-lut), 2,2-bipyridine (2,2-bipy) and 4,4-bipyridine (4,4-bipy), to give [Pd(N,C-dmba)(NCO)(2,3-lut)](2), [Pd(N,C-dmba)(NCO)(3,4-lut)](3), [{Pd(N,C-dmba)(NCO)}2(-2,2-bipy)]· CH2Cl2
(4) and [{Pd(N,C-dmba)(NCO)}2(-4,4-bipy)]· CH2Cl2
(5), respectively. The compounds were characterized by elemental analysis, i.r. and n.m.r. spectroscopy and also by t.g.a. The i.r. spectra of (2–5) display typical bands of monodentate N-bonded cyanate groups, whereas the n.m.r. data of (4) are consistent with the presence of a bridging 2,2-bipyridine ligand. Complex (4) decomposes slowly in acetone. One of the products formed, [Pd(H2CCOMe)Cl(2,2-bipy)](6), was characterized by X-ray diffraction. As inferred from the t.g.a., the thermal stability decreases in the order:[{Pd(N,C-dmba)(NCO)}2(-4,4-bipy)].CH2Cl2
(5) > [Pd(N,C-dmba)(2,3-lut)(NCO)](2)=[Pd(N,C-dmba)(3,4-lut)(NCO)](3) > [{Pd(N,C-dmba)(NCO)}2(-2,2-bipy)]· CH2Cl2
(4). According to thermal analysis and X-ray diffraction patterns compounds (2–3) decompose into metallic palladium Pd(0), whereas (4–5) decompose with the formation of PdO. The X-ray crystal and molecular structure of [Pd(N,C-dmba)(NCO)(2,3-lut)](2) was determined. The lutidine unit is perpendicular to the coordination plane. 相似文献
13.
Danuta M. Czakis-Sulikowska Joanna Radwańska-Doczekalska Grzegorz Sójka 《Monatshefte für Chemie / Chemical Monthly》1984,115(8-9):961-973
4,4-Dipyridyl complexes of rare-earth thiocyanates of the formulaLn(4-dipy)2(NCS)3·5H2O (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, Lu, Y, 4-dipy = 4,4-dipyridyl) have been synthesized. The IR spectra of these compounds and other physical properties are discussed. The thermal decomposition of some compounds (in the order Gd ÷ Lu) has been investigated.
4,4-Dipyridylkomplexe von Seltenerdmetallthiocyanaten
Zusammenfassung Es wurden 4,4-Dipyridylkomplexe des TypesLn(4-dipy)2(NCS)3·5H2O mitLn = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, Lu und Y dargestellt. Die IR-Spektren und andere physikalische Eigenschaften werden diskutiert und die thermische Zersetzung von einigen Verbindungen (in der Reihe Gd ÷ Lu) untersucht.相似文献
14.
Zhang Xuan-Jun Wu Jie-Ying Zhang Ming-Liang Tian Yu-Peng Jiang Min-Hua Usman Anwar Chantrapromma Suchada Fun Hoong-Kun 《Transition Metal Chemistry》2003,28(6):707-711
Two coordination polymers [Zn(Cabo)2(EtOH)2(4,4-Bipy)]
n
(1), and [Zn2(Cabo)2(NO3)2(4,4-Bipy)2]
n
(2) (Cabo = carbazolylacetate, 4,4-Bipy = 4,4-bipyridine) with chain and ladder structures, respectively, were prepared and characterized by X-ray single-crystal structural analysis. The results showed that the different anions of metal salts have a large effect on the construction of coordination frameworks. Both complexes show strong emissions in the solid state as well as high thermal stability. 相似文献
15.
L. I. Strigina Ya. V. Rashkes V. A. Denisenko Yu. M. Mil'grom 《Chemistry of Natural Compounds》1990,26(2):161-165
A new direction of the reaction of pennogenin diacetate with BF3·Et2O has been discovered in which a previously unknown dimeric steroid is formed — (25R,22R,25R)-3,3-diacetoxy-26,22-epoxy-16,16-bifurosta-5,20(22), 5,17(20)-tetraen-26-ol, the structure of which has been established as the result of an analysis of IR, UV,1H and13C NMR, and mass spectra. A probable mechanism for the formation of the title compound from pennogenin diacetate is suggested.Pacific Ocean Institute of Bioorganic Chemistry, Far Eastern Branch, USSR Academy of Sciences, Vladivostok. Institute of Chemistry of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 202–208, March–April, 1990. 相似文献
16.
Rafael Usón Luis A. Oro Montserrat Esteban Ana M. Cuadro Pilar Navarro José Elguero 《Transition Metal Chemistry》1982,7(4):234-238
Summary The reaction of [RhClY2]2 (Y2 = diolefin; Y = CO) with 3,3,5,5-tetramethyl-4,4-bipyrazole and 4,4-methylen-bis (3,5-dimethylpyrazole) (H2LL) leads to binuclear complexes of the type (H2LL) [RhClY2]2. The addition of triethylamine to the latter complexes gives polynuclear [(LL){RhY2}2]n derivatives. Related compounds of formula [(LL){RhX(PPh3)}2]n (X = CO or CS) are also reported.Part of this paper was presented at the VIIIth International Congress of Heterocyclic Chemistry which was held in Graz, Austria. August 1981. 相似文献
17.
Bikrani Mohammed Fidalgo M. Luz Garralda María A. Ibarlucea Lourdes 《Transition Metal Chemistry》1999,24(4):394-397
-Diimines, RN:C(R)C(R):NR(LL) derived from glyoxal, GLL (R=H) abbreviated as GAA (R= R=4-dimethylaminophenyl) or GHA (R= R=4-hydroxyphenyl), and derived from biacetyl, BLL (R=Me) abbreviated as BDH (R=R= NH2), BOH (R=NH2, R=OH) react with carbonylrhodium(I) compounds to give different products depending on the imino substituents in the ligand and/or the solvent employed. The reaction of -diimines bearing amino groups, such as GAA or BDH with [RhCl(CO)2]2 in acetone yields binuclear [RhCl(CO)2]2(-LL) while in CH2Cl2 ionic [Rh- (CO)2(LL)]+[RhCl2(CO)2]– species are obtained. In acetone [RhCl(CO)2]2(-GAA) exists as an equilibrium mixture between two different neutral binuclear species; [Rh(CO)2(BDH)]+ exists as a mixture of two species containing chelate or monodentate bonded diimine respectively. GAA or BDH react in situ with [RhCl(CO)(C2H4)]2 in benzene to yield tetracoordinated monocarbonylated [RhCl(CO)(LL)] compounds. -Diimines (LL) bearing hydroxy groups, such as GHA or BOH react with [RhCl(CO)2]2 or [RhCl(CO)(C2H4)]2 to give pentacoordinated dicarbonylated [RhCl(CO)2(LL)] compounds. 相似文献
18.
Treatment of [MI2(CO)3(NCMe)2] with two equivalents of 4,4-bipyridine (4,4-bipy) in CH2Cl2 at room temperature gave the MeCN displaced products, [MI2(CO)3(4,4-bipy-N)2] (1) and (2). Equimolar amounts of [MI2(CO)3(NCMe)2] and L (L = PPh3, AsPh3 or SbPh3) react to give [MI2(CO)3(NCMe)L], which when reacted in situ with 4,4-bipy yield the new complexes, [MI2(CO)3(4,4-bipy-N)L] (3)–(8). Reaction of equimolar quantities of [WI2(CO)(NCMe)(
2-RC2R)2] (R = Me or Ph) and 4,4-bipy gave the new bis(alkyne) complexes, [WI2(CO)(4,4-bipy-N)(
2-RC2R)2] (9) and (10). Treatment of [MI2(CO)3(NCMe)2] with two equivalents of (9) or (10) in CH2Cl2 at room temperature affords the bimetallic complexes, [MI2(CO)3{WI2(CO)(4,4-bipy-N,N)(
2-RC2R)2}2] (11)–(14). Equimolar quantities of [MI2(CO)3(NCMe)(PPh3)] (prepared in situ) and (9) or (10), react to give the 4,4-bipy-bridged complexes, [MI2(CO)3{WI2(CO)(4,4-bipy-N,N)(
2-RC2R)2}(PPh3)] (15)–(18). All the new complexes, (1)–(18) were characterised by elemental analysis (C, H and N), i.r. and 1H-n.m.r. spectroscopy. 相似文献
19.
G. A. Vitovskaya N. P. Elinov I. S. Kozhina G. Z. Mamatov 《Chemistry of Natural Compounds》1972,6(1):12-15
Conclusions 1. Xanthalin has been shown to have the structure of 2, 2-dimethyl-3, 4,-diangeloyloxy-3, 4-dihydropyrano-5, 6:6, 7-coumarin on the basis of the preparation of a number of derivatives and cleavage products.2. The following products of the alkaline hydrolysis of xanthalin have been isolated and characterized for the first time: (±)-3, 4-dihydroxy-3, 4-dihydroxanthyletin (isokhellactone), C14H14O5, with mp 213–215° C and (–)-trans-3-hydroxy-4-methoxy-3, 4-dihydroxanthyletin (isomethylkhellactone, C15H16O5, with mp 136.5–138° C and []
D
20
–47.7 (ethanol).Khimiya Prirodnykh Soedinenii, Vol. 6, No. 1, pp. 14–19, 1970 相似文献
20.
Yu. N. Bannikova A. N. Maslivets Z. G. Aliev 《Russian Journal of Organic Chemistry》2004,40(12):1791-1797
Methyl 1-aryl-3-aroyl-4,5-dioxo-4,5-dihydro-1H-pyrrole-2-carboxylates react with N-substituted 3-amino-5,5-dimethyl-2-cyclohexenones to give 4-hydroxy-1-aryl-3-aroyl-6,6-dimethyl-1, 2,3,4,5,5,6,7-octahydro-1H,2H-indole-3-spiro-2-pyrrole-2,4,5-triones. The structure of the products was proved by the X-ray diffraction data for the 1-cyclohexyl derivative.__________Translated from Zhurnal Organicheskoi Khimii, Vol. 40, No. 12, 2004, pp. 1840–1845.Original Russian Text Copyright © 2004 by Bannikova, Maslivets, Aliev.For communication XLVIII, see [1]. 相似文献