Zeitschrift Fur Naturforschung Section B-A Journal of Chemical Sciences最新文献

{"title":"Biological activity of synthetic juvenile hormone analogues (JHA) for Trypanosoma cruzi","authors":"A. Stoka, C. Rivas, E. Segura, Juan B Rodriguez, E. G. Gros","doi":"10.1515/znb-1990-0119","DOIUrl":"https://doi.org/10.1515/znb-1990-0119","url":null,"abstract":"Several juvenile hormone analogues, among them Fenoxycarb and authentic JH-III, were tested as growth inhibitors for Trypanosoma cruzi cultivated in vitro. The same compounds were also assayed for inhibition of tritium labelled-thymidine incorporation into T. cruzi cells. The results indicated that those analogues containing sulfur showed important activity against the development of the cells. Interesting inhibition values were also found for the remaining fenoxy- fenoxy derivatives assayed.","PeriodicalId":51215,"journal":{"name":"Zeitschrift Fur Naturforschung Section B-A Journal of Chemical Sciences","volume":"45 1","pages":"96-98"},"PeriodicalIF":0.8,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/znb-1990-0119","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66888497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"BEDT-TTF-Salze mit quadratischen Platinaten(II) als gegenionen : [BEDT-TTF]4[Pt(CN)4]","authors":"Stephan Gärtner, Ilsabe Heinen, H. Keller, R. Niebl, B. Nuber, D. Schweitzer","doi":"10.18419/OPUS-5029","DOIUrl":"https://doi.org/10.18419/OPUS-5029","url":null,"abstract":"Im folgenden beschreiben wir Synthese, Kristallstruktur und das physikalische Verhalten verschiedener Modifikationen einer weiteren Verbindung aus dieser Reihe, dem [BEDT-TTF]4[Pt(CN)4]. Uber eine bei Raumtemperatur metallische Modifikation dieses Festkorpers wurde kurzlich berichtet. Diese Modifikation wird im folgenden als [BEDT-TTF]4[Pt(CN)4'] bezeichnet und hat die folgenden Zelldaten: triklin,α=11,002(9) A,b=17.906(9)A,c=16,625(7)A, a=77.28(4)°,β=84,17(5)°,γ=81.26(6)°. Raumgruppe CI,Z=2[5]. Uns gelang nun die Isolierung und die physikalische Charakterisierung von drei weiteren Festkorpern mit der genannten Zusammensetzung. Wir nennen diese β-,γ- und δ-Phase.","PeriodicalId":51215,"journal":{"name":"Zeitschrift Fur Naturforschung Section B-A Journal of Chemical Sciences","volume":"45 1","pages":"763-774"},"PeriodicalIF":0.8,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67640157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Darstellung und Kristallstruktur von NdSe1.9","authors":"W. Urland, P. Plambeck-Fischer, M. Grupe","doi":"10.15488/2468","DOIUrl":"https://doi.org/10.15488/2468","url":null,"abstract":"","PeriodicalId":51215,"journal":{"name":"Zeitschrift Fur Naturforschung Section B-A Journal of Chemical Sciences","volume":"44 1","pages":"261-264"},"PeriodicalIF":0.8,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67149559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Donor/Akzeptor-Komplexe aus 1,3,5-Tris(dimethylamino)benzol und 1,2,3,4,5,6-Hexacyanobenzol","authors":"H. Keller, R. Niebl, G. Renner, D. Ruhr, A. K. Kilic, D. Schweitzer","doi":"10.18419/OPUS-7651","DOIUrl":"https://doi.org/10.18419/OPUS-7651","url":null,"abstract":"Wie kurzlich berichtet, sind wir auf der Suche nach \"organischen\" Ferromagneten. Als Zielsubstanzen haben wir kristallisierte Radikal-Ionen mit bahnentarteten Grundzustanden ausgewahlt, die nach verschiedenen Modellvorstellungen zur Herstellung \"organischer Ferromagnete\" besonders erfolgversprechend sein sollten. Uber zwei Reaktionsprodukte eines Donors mit D3h-Symmetrie (1,3,5-Tris(dimethylamino)benzol, TDMAB) mit einem hochsymmetrischen Akzeptor (1,2,3,4,5,6-Hexacyanobenzol, HCNB, D6h-Symmetrie) wird im folgenden berichtet.","PeriodicalId":51215,"journal":{"name":"Zeitschrift Fur Naturforschung Section B-A Journal of Chemical Sciences","volume":"44 1","pages":"327-332"},"PeriodicalIF":0.8,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67641117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamisches Verhalten dimerer 1,3,2,4 lambda2-Diazasilastannetidine und -plumbetidine in Lösung - eine Multikern-NMR-Studie","authors":"B. Wrackmeyer, Klaus Horchler, Hong Zhou, M. Veith","doi":"10.22028/D291-22559","DOIUrl":"https://doi.org/10.22028/D291-22559","url":null,"abstract":"1,3-diisopropyl-2,2-dimethyl-1,3,2,4?2-diazasilastannetidine (1b) and -plumbetidine (2b) are dimeric [(1b)2, (2b)2] in solution. At room temperature the structure of (1b)2 is fluxional. The dynamic behaviour is interpreted - on the basis of 1H, 13C, 29Si and 119Sn NMR data - as an intramolecular process in which the four-membered rings keep their identity. Such a process involves either concerted opening of the two coordinative Sn-N bonds and mutual slippage of the two rings, or consecutive cleavage of one of the coordinative Sn-N bonds and rotation about the other one. At room temperature the dimer (2b)2 is in equilibrium with its monomer 2b, whereas at low temperature the dynamic process corresponds to that established for (1b)2. In solutions which contain a mixture of the dimers (1b)2 and (2b)2, the presence of the mixed dimer 1b/2b can be proved unambiguously by consistent 29Si, 119Sn and 207Pb NMR data.","PeriodicalId":51215,"journal":{"name":"Zeitschrift Fur Naturforschung Section B-A Journal of Chemical Sciences","volume":"44 1","pages":"288-292"},"PeriodicalIF":0.8,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67970883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cyclische Diazastannylene. - XXX : Symmetrisch und asymmetrisch substituierte German- und Stannandiyle mit Amid-, Alkoholat- und Thiolat-Liganden. - Teil I","authors":"M. Veith, P. Hobein, R. Rösler","doi":"10.22028/D291-22561","DOIUrl":"https://doi.org/10.22028/D291-22561","url":null,"abstract":"M. V eith*. P. H obein und R. R osier Institut für Anorganische Chemie der Universität des Saarlandes, D-6600 Saarbrücken Z. Naturforsch. 44b, 1067—1081 (1989); eingegangen am 2. März 1989 Syntheses, X-Ray, Symmetrically and Unsymmetrically Substituted Germaneand Stannanediyls, Chelates of G e(II) and Sn(II) Symmetrically and unsymmetrically substituted germaneand stannanediyls as well as che­ lated bis(amino)or aminooxogermaniumand -tinmonohalides have been obtained from cyclic bis(amino)germaneand stannanediyls by treatment with /m -butylam ine, fm -butanol and rm -butylm ercaptane. The following compounds have been svnthesized; GeX^ (X = OrBu (5), SrBu (6)), Sn(SrBu), (9), GeXCl (X = N(H)rBu (21), Ö/Bu (22)), SnXCl (X = N(H)rBu (23), O/Bu (24), S/Bu (25), OMe (28)) and Sn(OzBu)Br (27). In the series of the chelates Me2Si(NrBu)(NH/Bu)GeCl (13), Me2Si(N?Bu)(OrBu)SnX (X = Cl (18). OMe (19)) and the bischelate [Me2Si(N?Bu)(0/Bu)]2Sn (20) have been prepared. When 18 is allowed to react with aluminiumtrimethyl Me2Si(N;Bu)(OrBu)AlClMe is formed, a compound with a center of chirality at ine aluminium atom. X-ray structure determinations have been performed on single crystals of 6, 8, 9, 13, 22 and 24. 6, 8, 22 and 24 form molecular dimers with c.n. of 3 at the Ge or Sn atoms, resp. While the /Bu —S ligands are syn with respect to the central G e2S2 ring in 6 (symmetry approaching C2v). the fBu — O ligands are anti to the central Sn20 2 ring in 8 (sym­ metry C|). 9 forms a coordination polymer with all Sn atoms in a i^-trigonal-bipyramidal and all S atoms in a i/'-tetrahedral environment. The germanium atom in 13 is coordinated by a chlorine, a A3and a A4-nitrogen atom , the two nitrogen atoms being connected by as dimethylsilyl group. The hydrogen and chlorine atom of 13 are found at the same side of the four-membered chelate ring. The two unsymmetrically substituted, homologous compounds G e(0/B u)C l (22) and Sn(OrBu)Cl (24) are found to form dimers via O—>Ge resp. O-^Sn bonds. While the chlorine atoms in 22 are syn with respect to the four-membered ring, they are anti in the case of molecule 24.","PeriodicalId":51215,"journal":{"name":"Zeitschrift Fur Naturforschung Section B-A Journal of Chemical Sciences","volume":"44 1","pages":"1067-1081"},"PeriodicalIF":0.8,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67971160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photoionenspektroskopie an Schwefelchloridpentafluorid SF5Cl, das Ionisationspotential von Schwefelpentafluorid SF5","authors":"H. Baumgärtel, H. Jochims, E. Rühl, O. Lösking, H. Willner","doi":"10.15488/2459","DOIUrl":"https://doi.org/10.15488/2459","url":null,"abstract":"Mesures des potentiels d'apparition de 12 a 20 eV par spectrometrie de masse a photoionisation","PeriodicalId":51215,"journal":{"name":"Zeitschrift Fur Naturforschung Section B-A Journal of Chemical Sciences","volume":"250 1","pages":"21-23"},"PeriodicalIF":0.8,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67149530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Darstellung und Kristallstruktur von [H3N(CH2)3NH3]SbCl5","authors":"A. Bois, W. Abriel","doi":"10.15488/2467","DOIUrl":"https://doi.org/10.15488/2467","url":null,"abstract":"","PeriodicalId":51215,"journal":{"name":"Zeitschrift Fur Naturforschung Section B-A Journal of Chemical Sciences","volume":"44 1","pages":"1151-1154"},"PeriodicalIF":0.8,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67149544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"1,3,5-Tris(dimethylamino)benzol mit Iod und 1,3,5-Tricyanobenzol : eine ungewöhnliche Dimerisierung und ein \"normaler\" Donor/Akzeptor-Komplex","authors":"H. Keller, R. Niebl, G. Renner, D. Ruhr, D. Schweitzer","doi":"10.18419/OPUS-7642","DOIUrl":"https://doi.org/10.18419/OPUS-7642","url":null,"abstract":"Wir sind auf der Suche nach \"organischen\" Ferromagneten. Als Zielsubstanz haben wir kristallisierte Radikal-Ionen mit bahnentarteten Grundzustanden ausgewahlt. Molekulare Festkorper aus planaren organischen Radikalionen zeigen ein breites Spektrum teilweise recht interessanter physikalischer Eigenschaften, die durch kollektives Elektronenverhalten zu erklaren sind. In den letzten Jahren wurde vor allem das elektrische Verhalten dieser Substanzen untersucht. Dies fuhrte zur Entdeckung einer Vielzahl \"organischer Metalle\", von denen einige bei tiefer Temperatur auch supraleitend werden.","PeriodicalId":51215,"journal":{"name":"Zeitschrift Fur Naturforschung Section B-A Journal of Chemical Sciences","volume":"43 1","pages":"265-270"},"PeriodicalIF":0.8,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67640666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Zur Koordination unterschiedlicher Hauptgruppenmetalle mit einem speziellen, chelatisierenden Silazan","authors":"M. Veith, F. Goffing, V. Huch","doi":"10.22028/D291-22557","DOIUrl":"https://doi.org/10.22028/D291-22557","url":null,"abstract":"The cis-isomer of the silazane H2L (1) (L=[NtBu][Me]Si(ntBu)2Si[Me][NtBu]) has been used as a ligand to main group metals. By displacing the hydrogen atoms of 1 the compounds L(MgMe)2 (4), L(MgCl)2 (5) and L(Li)(InMe2) (6) have been obtained. According to the 1H NMR spectra the structures of 4-6 are very similar: a polycyclic, cubane-like Si2N4M2 framework results from the special atomic arrangements and from intramolcular Lewis acid-base interactions between the metals M and the nitrogen atoms. Divalent metals and metal-centered groups can also be incorporated into 1. In the latter case a seco norcubane-like polycycle Si2N4M is produced as confirmed by X-ray structure determinations of LGaMe (8) and LSb+InCl4- (11). LInMe (7) and LSn (9) seem to adopt the same tricyclic structure as 8, although the 1H NMR spectra are not consistent with a rigid molecule (low symmetry), but rather with a fluxional behaviour (high symmetry). When 5 is allowed to react with sodium/naphthalene in THF part of the magnesium is reduced and LMg(THF)2 (12) is formed. An X-ray structure determination of 12 reveals the compound to be only bicyclic with the magnesium atom coordinated by two nitrogen and two THF oxygen atoms.","PeriodicalId":51215,"journal":{"name":"Zeitschrift Fur Naturforschung Section B-A Journal of Chemical Sciences","volume":"43 1","pages":"846-856"},"PeriodicalIF":0.8,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67971219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}