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  • Rhenium complexes  (7)
  • crystal structure  (5)
  • 1,1-dicyanoethene-2,2-dithiolate (i-mnt)  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Isothiocyanato complexes of rhenium III. Synthesis and characterization of [ReN(NCS)"2(Ph"3P)"2] and [ReN(NCS)"2(CH"3CN)(Ph"3P)"2]. X-ray crystal structure of [ReN(NCS)"2(CH"3CN)(Ph"3P)"2].CH"3CN
    Amsterdam : Elsevier
    Inorganica Chimica Acta 224 (1994), S. 193-197 
    Details
    ISSN: 0020-1693
    Keywords: Crystal structures ; Isothiocyanato complexes ; Nitrido complexes ; Rhenium complexes
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0020-1693(94)04120-2
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  • 2
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    Electronic Resource
    Isothiocyanato complexes of rhenium II. Synthesis, characterization and structures of ReN(NCS)"2(Me"2PhP)"3 and Re(NS)(NCS)"2(Me"2PhP)"3
    Amsterdam : Elsevier
    Inorganica Chimica Acta 216 (1994), S. 223-228 
    Details
    ISSN: 0020-1693
    Keywords: Crystal structures ; Isothiocyanato complexes ; Rhenium complexes
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0020-1693(93)03737-U
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  • 3
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    Mixed-ligand complexes of rhenium III. Synthesis, characterisation and structures of [ReN(Me"2PhP)"2(mnt)] and [ReN(Me"2PhP)(2,6-DMTP)(morphtcb)] (Me"2PhP = dimethylphenylphosphine; 2,6-DMTP^- = 2,6-dimethylthiophenolate; morphtcb^-=N-(morpholinylthiocarbonyl)- benzamidinate)
    Amsterdam : Elsevier
    Inorganica Chimica Acta 216 (1994), S. 31-36 
    Details
    ISSN: 0020-1693
    Keywords: Nitrido complexes ; Rhenium complexes
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0020-1693(93)03729-T
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  • 4
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    Electronic Resource
    Mixed-ligand complexes of rhenium II. Synthesis and characterization of [ReN(X)(Me"2PhP)"2(R"2tcb)] complexes (X = I, N"3, SCN, CN; R"2tcb^t^-N-(N,N-dialkyl-thiocarbamoylbenzamidinate)). X-ray crystal structure of [ReN(N"3)(Me"2PhP)"2(Et"2tcb)]
    Amsterdam : Elsevier
    Inorganica Chimica Acta 215 (1994), S. 159-163 
    Details
    ISSN: 0020-1693
    Keywords: Bidentate ligand complexes ; Chelate complexes ; Crystal structures ; Nitrido complexes ; Rhenium complexes
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0020-1693(93)03695-7
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  • 5
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    Gemischtligand-Komplexe des Rheniums. IV. Die Reaktion von [ReNCl2(Me2PhP)3] mit Dithiocarbamaten. Kristallstrukturen von trans-Chloro-dimethyldithiocarbamato-bis(dimethylphenylphosphan) nitridorhenium(V), [ReN(Cl)(Me2PhP)2(Me2dtc)], und Bis(diethyldithiocarbamato)(dimethylphenylphosphan)nitridorhenium(V), [ReN(Me2PhP)(Et2dtc)2] (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1443-1448 
    Details
    ISSN: 0044-2313
    Keywords: Rhenium complexes ; Nitrido compounds ; Mixed-ligand complexes ; X-ray crystal structure ; Ligand exchange ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mixed-Ligand Complexes of Rhenium IV. The Reaction of [ReNCl2(Me2PhP)3] with Dithiocarbamates. X-Ray Crystal Structures of trans-Chloro-dimethyldithiocarbamato-bis(dimethylphenylphosphine) nitridorhenium(V), [ReN(Cl)(Me2PhP)2(Me2dtc)], and Bis(diethyldithiocarbamato)(dimethylphenylphosphine)nitridorhenium(V), [ReN(Cl)(Me2PhP)(Et2dtc)2][ReNCl2(Me2PhP)3] reacts with dialkyldithiocarbamates, R2dtc-, under a stepwise ligand exchange. Final products of these reactions are the well-known [ReN(R2dtc)2] bischelates. Intermediatelly, however, complexes of the general formulae [ReN(Cl)(Me2PhP)2(R2dtc)] and [ReN(Me2PhP)(R2dtc)2] can be isolated. Representatives have been structurally characterized.[ReN(Cl)(Me2PhP)2(Me2dtc)] crystallizes monoclinic in the space group P21/c, Z = 4. The dimensions of the unit cell are a = 13.071(3); b = 11.622(1); c = 15.667(3) Å; β = 97.09(1)°. The rhenium atom has a distorted octahedral environment; the Re≡N bond length is 1.71(1) Å. The Re—Cl bond distance is markedly lengthened (2.665(2) Å) as a consequence of the strong trans labilizing influence of the coordinated nitrido ligand.[ReN(Me2PhP)(Et2dtc)2] crystallizes monoclinic in the space group P21/c, Z = 4, a = 17.262(3); b = 14.915(2); c = 9.888(2); β = 76.35(8)°. The equatorial coordination sphere is occupied by one phosphorus atom and three sulphur atoms. One of the dithiocarbamate ligands is coordinated bidentately; the second one with two distinct Re—S bond lengths. The Re—S(4) distance is 2.7983(2) Å which can be discussed as a weak interaction with the metal.
    Notes: Dichlorotris(dimethylphenylphosphan)nitridorhenium(V), [ReNCl2(Me2PhP)3], reagiert mit Dialkyldithiocarbamaten, R2dtc-, unter schrittweisem Ligandenaustausch. Als Endprodukte entstehen Komplexe der allgemeinen Formel [ReN(R2dtc)2]. Als Intermediate dieser Reaktion konnten Komplexe der Zusammensetzung [ReN(Cl)(Me2PhP)2(R2dtc)] und [ReN(Me2PhP)(R2dtc)2] isoliert und strukturell charakterisiert werden.[ReN(Cl)(Me2PhP)2(Me2dtc)] kristallisiert monoklin in der Raumgruppe P21/c, Z = 4. Die Elementarzelle hat die Abmessungen a = 13,071(3); b = 11,622(1); c = 15,667(3) Å; β = 97,09(1)°. Rhenium befindet sich in einer verzerrt oktaedrischen Koordinationsumgebung. Der Re≡N-Bindungsabstand beträgt 1,71(1) Å. Die trans-ständige Re—Cl-Bindung ist infolge des trans-Effektes des koordinierten Nitridoliganden stark aufgeweitet (2,665(2) Å).[ReN(Me2PhP)(Et2dtc)2] kristallisiert monoklin in der Raumgruppe P21/c, Z = 4, a = 17,262(3); b = 14,915(2); c = 9,888(2); β = 76,35(8)°. Die äquatoriale Koordinationssphäre ist mit einem Phosphor- und drei Schwefelatomen besetzt. Ein Dithiocarbamat-Ligand ist als „normales“ Chelat koordiniert; der andere ist mit zwei sehr unterschiedlichen Re—S-Abständen gebunden, wobei auch für das zweite Schwefelatom (Abstand Re—S(4): 2,7983(2) Å) Wechselwirkungen mit dem Metall diskutiert werden können.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/zaac.19946200821
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  • 6
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    Synthesis and Characterization of Bis(tetrabutylammonium) bis(isotrithionedithiolato-S,S′)nitridotechnetate(V), (Bu4N)2[TcN(dmit)2]Dedicated to Professor Joachim Strähle on the Occasion of his 60th Birthday (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 880-882 
    Details
    ISSN: 0044-2313
    Keywords: Technetium ; nitrido complexes ; crystal structure ; sulfur ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese und Charakterisierung von Bis(tetrabutylammonium) bis(isotrithiodithiolat-S,S′)nitridotechnetat(V), (Bu4N)2[TcN(dmit)2](Bu4N)2[TcN(dmit)2] (dmit2- = isotrithiodithiolat) wurde aus Na2dmit, (Bu4N)[TcNCl4] und (Bu4N)Cl in Acetonitril hergestellt. Die Verbindung kristallisiert monoklin, Raumgruppe C2/c mit a = 23,143(5), b = 8,342(2), c = 26,382(5) Å, β = 95,12(3), Z = 4. Die Bindungslänge Tc≡N beträgt 1,615(6) Å. Tc und N(l) befinden sich auf einer zweizähligen kristallographischen Achse. Der Komplex hat quadratisch-pyramidale Geometrie. Die vier Schwefelatome bilden die Grundfläche der Pyramide, deren Spitze vom Nitrido-Stickstoff eingenommen wird. Das Technetiumatom befindet sich um 0,62 Å über der Grundfläche.
    Notes: (Bu4N)2[TcN(dmit)2] (dmit2- = isotrithionedithiolate) was prepared from Na2dmit, (Bu4N)[TcNCl4] and (Bu4N)Cl in acetonitrile. The compound crystallises in the monoclinic space group C2/c with a unit cell of the dimensions a = 23.143(5), b = 8.342(2), c = 26.382(5) Å, β = 95.12(3), Z = 4. The Tc≡N bond distance is comparatively short at 1.615(6) Å. Tc and N(1) are situated on a two-fold crystallographic axis. The general coordination geometry is a square pyramid with the four sulfur atoms forming the basal plane and the nitrido nitrogen at the apex. The technetium is located 0.62 Å above the plane defined by the four sulphurs.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/zaac.199762301138
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  • 7
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    Gold(III)-Komplexe mit 2-(N,N-Dimethylaminomethyl)phenyl (damp-). Darstellung und Kristallstrukturen von [Au(damp-C,N)Cl2], [Au(damp-C,N)(OOCCH3)2] und [Au(damp-C,N)(mnt)] (mnt2- = 1,2-Dicyanoethen-1,2-dithiolat)Professor Joachim Strähle zum 60. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 873-879 
    Details
    ISSN: 0044-2313
    Keywords: Gold(III) ; complexes ; dichloro-2-(N,N-dimethylaminomethyl)phenylgoId(III) ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Gold(III) Complexes with 2-(N,N-dimethylaminomethyl)phenyl (damp-). Syntheses and Structures of [Au(damp-C,N)Cl2], [Au(damp-C,N)(OOCCH3)2] and [Au(damp-C,N)(mnt)] (mnt2- = 1.2-dicyanoethene-1.2-dithiolate)Dichloro-2-(N,N-dimethylaminomethyl)phenylgold(III), [Au(damp-C,N)Cl2], was prepared by the reaction of [Hg(damp)Cl] with Na[AuCl4] and crystallizes monoclinic, space group P21/c a = 7.896(3), b = 9.487(2), c = 15.107(6) Å, β = 100.22(3)°, Z = 4. The crystal structure consists of monomeric [Au(damp-C,N)Cl2] units with square-planar coordinated gold atoms. The shortest Au-Au distances are 4.977 Å. [Au(damp-C,N)(OOCCH3)2] can be synthesized by the reaction of [Au(damp-C,N)Cl2] and AgOOCCH3 in CH2Cl2. Single crystals of the composition [Au(damp-C,N)(OOCCH3)2]. 0.5 H2O were obtained from moist CH2Cl2: monoclinic, space group C2/c, a = 16.626(8), b = 10.640(1), c = 16.271(7) Å, β = 91.90(2)°, Z = 8. The gold atom is square-planar coordinated. The acetato ligands are bound monodentately. The solvent water forms strong hydrogen bridges to the complex molecules in the solid state structure.The chloro ligands in [Au(damp-C,N)Cl2] can easily be replaced by dianionic chelate ligands. The reaction with Na2mnt (mnt2- = 1.2-dicyanoethene-l.2-dithiolate) gives in almost quantitative yield the neutral complex [Au(damp-C,N)(mnt)], which crystallizes orthorhombic, space group Pna21 with a = 7.651(1), b = 14.476(1), c = 13.353(1 ) Å, Z = 4. The gold atom is square-planar coordinated. The Au-S distances are 2.363(2) Å and 2.270(2) Å, respectively.
    Notes: Dichloro-2-(N,N-dimethylaminomethyl)-phenylgold(III), [Au(damp-C,N)Cl2], hergestellt durch Umsetzung von [Hg(damp)Cl] mit Na[AuCl4], kristallisiert monoklin, Raumgruppe P21/c mit a = 7,896(3); b = 9,487(2); c = 15,107(6) Å; β = 100,22(3)°, Z = 4. Die Kristallstruktur besteht aus monomeren [Au(damp-CN)Cl2]-Einheiten mit quadratisch-planar koordinierten Goldatomen. Die kleinsten Gold-Gold-Abstände betragen 4,977 Å.[Au(damp-C,N)(OOCCH3)2] wird durch Reaktion von [Au(damp-C,N)Cl2] mit AgOOCCH3 in CH2Cl2 hergestellt und aus feuchtem CH2C12 als [Au(damp-C,N)(OOCCH3)2] · 0,5 H2O kristallisiert: monoklin, Raumgruppe C2/c a = 16,626(8); b = 10,640(1); c = 16,271(7) Å; β = 91,90(2)°, Z = 8. Das Goldatom ist quadratisch-planar koordiniert. Die Acetatoliganden binden jeweils einzähnig. Das in das Kristallgitter eingebaute Lösungsmittel ist durch Wasserstoffbrücken in die Festkörperstruktur eingebunden.Die Chloroliganden von [Au(damp-C,N)Cl2] können leicht durch zweifach negativ geladene Chelatliganden ausgetauscht werden. Die Reaktion mit Na2mnt in Aceton er gibt in nahczu quantitativer Ausbeute den Neutralkomplex [Au(damp-C,N)(mnt)], der in der orthorhombischen Raumgruppe Pna21 kristallisiert (a = 7,651(1); b = 14,476(1); c = 13,353(1) Å, Z = 4). Das Goldatom befindet sich in einer quadratisch-planaren Koordinationsumgebung. Die Au-S-Abstände betragen 2,363(2) bzw. 2,270(2) Å.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.199762301137
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  • 8
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    Neue Gemischtligandenkomplexe mit Perthiocarboxylaten (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1659-1663 
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    ISSN: 0044-2313
    Keywords: O-methyl-1,1-dithiooxalate ; mixed ligand complexes ; perthio carboxylates ; xanthates ; 1,1-dicyanoethene-2,2-dithiolate (i-mnt) ; 1,2-dithiooxalat ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Mixed Ligand Complexes with Perthio CarboxylatesSolutions of O-methyl-1,1-dithiooxalate (i-dtoMe) and metal(II)-chlorides (NiII, PdII) in the molar ratio 2:1 react with equimolar amounts of homonuclear bischelates of other 1,1- and 1,2-dithio-compounds L (L = i-mnt, Etxan, dto) to mixed ligand complexes M(ptoMe)L with spontaneous convertion of the 1,1-dithiooxalate into the corresponding perthio ligand (ptoMe) by sulfur insertion. Tetraphenylphosphonium-(1,1-dicyanoethene-2,2-dithiolato)(O-methyl-1,1 -perthio-oxalato)niccolat(II), Ph4P[Ni(i-mnt)(ptoMe)], crystallizes in the monoclinic space group P21/n with a = 11.019(2) Å, b = 13.648(3) Å, c = 20.882(3) Å, β = 92.565(7)°. The formation of the perthio ligand is confirmed by 13C-NMR.
    Notes: Lösungen von O-Methyl-1,1-dithiooxalat (i-dtoMe) und Metall(II)-chloriden (NiII, PdII) im molaren Verhältnis 2:1 reagieren mit equimolaren Mengen gleichkerniger Bischelate anderer 1,1- und 1,2-Dithioverbindungen L (L = i-mnt, Etxan, dto)Abkürzungen: i-mnt: 1,1-Dicyanoethen-2,2-dithiolat Etxan: Ethylxanthogenat dto: 1,2-Dithiooxalat i-dtoMe: O-Methyl-1,1-dithiooxalat ptoMe: O-Methyl-1,1-perthiooxalat unter Ligandenaustausch zu Gemischtligandenkomplexen M(ptoMe)L bei spontaner Umwandlung des 1,1-Dithiooxalates zum entsprechenden Perthioliganden (ptoMe) durch Schwefelinsertion. Tetraphenylphosphonium (1,1-dicyanoethen-2,2-dithiolato)(O-methyl-1,1-perthiooxalato)niccolat(II), Ph4P[Ni(i-mnt)(ptoMe)], kristallisiert in der monoklinen Raumgruppe P21/n mit a = 11,019(2) Å, b = 13,648(3) Å, c = 20,882(3) Å, β = 92,565(7)°. Die Bildung des Perthioliganden konnte mittels 13C-NMR bestätigt werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200926
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  • 9
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    Gemischtligandkomplexe des Technetiums. XVI. Darstellung und Struktur von (1,2-Dicyanoethen-1,2-dithiolato)bis(dimethylphenylphosphan)nitridotechnetium (V), [TcN(Me2PhP)2(mnt)] (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1975-1978 
    Details
    ISSN: 0044-2313
    Keywords: Technetium ; nitrido complexes ; crystal structure ; dithiolenes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mixed-Ligand Complexes of Technetiums. XVI Synthesis and Structure of (1,2-Dicyanoethene-1,2-dithiolato)bis(dimethylphenylphosphine)nitridotechnetium(V), [TcN(Me2PhP)2(mnt)][TcN(Me2PhP)2(mnt)] is formed from [TcNCl2(Me2PhP)3] and one equivalent of the sodium salt of 1,2-dicyanoethene-1,2-dithiolate (Na2mnt). The same reaction yields [TcN(mnt)2]2-, when a large excess of the ligand and long reaction periods are applied. The complex anion can be isolated as tetraalkylammonium or tetraphenylarsonium salts.[TcN(Me2PhP)2(mnt)] crystallizes in the triclinic space group P1 (a = 10.000(5), b = 14.182(6), c = 17.77(1) Å, α = 98.77(3), β = 103.77(3), γ = 104.55(3)°; Z = 4). The coordination sphere is a square pyramid with the sulfur and phosphorus atoms as basal plane. Tc is situated out of this plane by 0.56 Å towards the nitrido ligand.
    Notes: [TcN(Me2PhP)2(mnt)] entsteht bei der Reaktion von [TcNCl2(Me2PhP)3] mit dem Natriumsalz des 1,2-Dicyanoethen-1,2-dithiolats (Na2mnt), wenn ein äquivalent des Liganden eingesetzt wird. Bei Verwendung eines Na2mnt-überschusses und Reaktionszeiten von mehreren Stunden bildet sich das Komplexanion [TcN(mnt)2]2-, das in Form seiner Tetraalkylammonium- bzw. Tetraphenylarsoniumsalze isoliert werden kann.[TcN(Me2PhP)2(mnt)] kristallisiert triklin (Raumgruppe P1; a = 10,000(5); b = 14,182(6); c = 17,77(1) Å; α = 98,77(3); β = 103,77(3); γ = 104,55(3)°; Z = 4). Das Koordinationspolyeder ist eine quadratische Pyramide, in der das Metall um 0,56 Å über der durch die Schwefel- und Phosphoratome gebildeten Grundfläche angeordnet ist.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/zaac.19966221127
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  • 10
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    μ-Oxoverbrückte, dimere Technetium- und Rheniumkomplexe mit funktionalisierten Aminophenolato-Liganden. Darstellung und Strukturen von [O=TcL1—O—L1Tc=O] · H2O und [O=ReL1—O—L1Re=O] (H2L1 = N,N′-Bis(2-hydroxybenzyl)-1,3-diamino-2-(4-nitrobenzyl)propan) (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 854-860 
    Details
    ISSN: 0044-2313
    Keywords: Technetium Compounds ; Rhenium complexes ; X-ray diffraction ; radiopharmaceuticals ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Characterization of μ-oxo Dimeric Technetium and Rhenium Complexes with Functionalized Amine Phenolate Ligands. X-Ray Crystal Structures of [O=TcL1—O—L1Tc=O] · H2O and [O=ReL1—O—L1Re=O] Complexes (H2L1 = N,N′-bis(2-hydroxybenzyl)-1,3-diamino-2-(4-nitrobenzyl)propane)Neutral rhenium(V) and technetium(V) chelates with the tetradentate amine phenolate ligand N,N′-bis(2-hydroxybenzyl)-1,3-diamino-2(-4-nitrobenzyl)propane (H2L1) have been prepared from [MOCl4]- complexes and structurally characterized. The ligand coordinates tetradentately with deprotonation of the phenolic oxygen atoms.[O=TcL1—O—L1Tc=O] · H2O crystallizes monoclinic in the space group P21/c with a = 10.633(2), b = 13.705(1), c = 16.364(3) Å; β = 94.65(1)°, Z = 2. Two TcOL1 units with each one terminal oxo core are connected by a μ-oxo ligand. The technetium atoms are situated in distorted octahedral coordination spheres. Two distinct Tc—O bond lengths have been found for the almost linear O=Tc—O—Tc=O unit (Tc=O(terminal): 1.655(7) Å and Tc—O(μ-oxo): 1.903(1)) Å.The analogous rhenium compound crystallizes in the same space group with a = 13.302(7), b = 9.956(1), c = 17.535(9) Å; β = 106.72(2)°, Z = 2. The dimeric [O=ReL1—O—L1Re=O] complex has a structure which is very similar to that of the corresponding technetium compound.
    Notes: Ausgehend von [MOCl4]--Komplexen werden mit dem vierzähnigen Amin-Phenolato-Liganden N,N-Bis(2-hydroxybenzyl)-1,3-diamino-2-4-nitrobenzyl)propan (H2L1) Rhenium(V)- und Technetium(V)-Chelate hergestellt und strukturell charakterisiert. Es entstehen sauerstoffverbrückte, neutrale Zweikernkomplexe mit einer zentralen [O=M—O—M=O]4+-Einheit. Der Ligand koordiniert jeweils vierzähnig unter Deprotonierung der Phenolfunktionen.[O=TcL1—O—L1Tc=O] · H2O kristallisiert monoklin in der Raumgruppe P21/c mit a = 10,633(2); b = 13,705(1); c = 16,364(3) Å; β = 94,65(1)°; Z = 2. Zwei TcOL1-Einheiten mit je einem terminalen Oxo-Liganden sind über eine Sauerstoff-Brücke miteinander verknüpft. Das Metall befindet sich in einer verzerrt oktaedrischen Umgebung. Für die Tc—O-Bindung der nahezu linearen O=Tc—O—Tc=O-Einheit wurden zwei unterschiedliche Bindungsabstände bestimmt (Tc=O(terminal): 1,655(7) Å und Tc—O(Brücke): 1,903(1) Å.Die analoge Rheniumverbindung kristallisiert in der gleichen Raumgruppe mit a = 13,302(7); b = 9,956(1); c = 17,535(9) Å; β = 106,72(2)°; Z = 2. Für das ebenfalls dimere Komplexmolekül [O=ReL1—O—L1Re=O] konnten ähnliche Bindungsverhältnisse wie für sein Technetium-Analogon bestimmt werden.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/zaac.19956210525
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