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  • 1
    ISSN: 1434-4475
    Keywords: Stannatrane ; Vibrational spectroscopy ; Proof of pentacoordination ; Assignment of vibrations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Results are reported of IR and Raman investigations on four 1-substituted 2,8,9-tricarbastannatranes (1,X=Cl;2,X=Br;3,X=I;4,X=Me). Group-theoretic investigations confirm the trigonal-bipyramidal configuration of the tin atoms. The vibrational frequencies of the coordination (Sn←N) are correlated to the distancesd (Sn-N). Besides the results on the vibrations of the coordination polyhedrons other results are reported concerning the enantiomerization of the chiral atran skeleton.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Platinum complex ; crown ether ; Raman and IR data ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese und Charakterisierung von cis- und trans-Tetrachlorobis(pyridin)platin(IV)[Na(15-cr-5)]2[PtCl6] · 2 H2O reagiert mit Pyridin in Wasser als Lösungsmittel zu cis-[PtCl4(py)2] (1) und in MeCN, DMF sowie in CH2Cl2 zu trans-[PtCl4(py)2] (2). Die Substitutionsreaktion wird durch Bestrahlung mit sichtbarem Licht beschleunigt. Sowohl gelöst in DMSO, DMF und MeCN als auch bei 503 K im festen Zustand isomerisiert 1 zu 2.1 und 2 sind umfassend IR- und ramanspektroskopisch charakterisiert worden. Die Molekülstruktur des trans-Isomeren 2 wurde auch durch Röntgeneinkristallstrukturunterschung ermittelt (monoklin, C2/m, a = 14.143(5), b = 7.171(3), c = 7.199(3) Å, β = 116.42(4)°, Z = 2, R1 = 0.0331, wR2 = 0.0727). 2 weist angenähert D2h Symmetrie auf, wobei die beiden trans-ständigen Pyridinliganden in einer Ebene liegen. Nach quantenchemischen Berechnungen ist 2 (D2h-Symmetrie) um 48.28 kJ/mol stabiler als 1 (C2v-Symmetrie).
    Notes: [Na(15-cr-5)]2[PtCl6] · 2 H2O reacts with pyridine in water as solvent to give cis-[PtCl4(py)2] (1) and in MeCN, DMF or in CH2Cl2 to give trans-[PtCl4(py)2] (2). The substitution reaction can be accelerated by irradiation with visible light. 1 isomerizes to give 2 in DMSO, DMF and MeCN as well as in solid state at 503 K.1 and 2 were thoroughly characterized IR and Raman spectroscopically. The molecular structure of the trans isomer 2 was also established by X-ray structure analysis (monoclinic, C2/m, a = 14.143(5), b = 7.171(3), c = 7.199(3) Å, β = 116.42(4)°, Z = 2, R1 = 0.0331, wR2 = 0.0727). 2 has nearly D2h symmetry with two trans standing pyridine ligands lying in a plane. According to quantum chemical calculations, 2 (D2h symmetry) is more stable (48.28 kJ/mol) than 1 (C2v symmetry).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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