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- W1976267989 abstract "Die IR- und Ramanspektren von Be(IO3)2 · 4 H2O sowie von deuterierten Präparaten (4000–50 cm−1, 90 und 300 K) werden mitgeteilt und im Hinblick auf die ungewöhnlichen Massenverhältnisse der beteiligten Atome sowie die große Polarisationswirkung von Berylliumionen diskutiert. So werden die Translationsschwingungen der Be2+-Ionen (BeO4-Gerüstschwingungen), die Librationen der H2O-Moleküle und die inneren Schwingungen der IO3−-Ionen jeweils im gleichen Spektralbereich (300–400 und 600–1000 cm−1) beobachtet. Dies hat ungewöhnliche Schwingungskopplungen mit vH/vD-Isotopenverschiebungen von z. T. < 1 zur Folge. Wegen des sehr großen Ionenpotentials der Be2+-Ionen wird das H-Brücken-Donorvermögen der H2O-Moleküle so verstärkt, daß in Be(IO3)2 · 4 H2O ähnlich starke Wasserstoffbrücken gebildet werden (synergetischer Effekt) wie in Hydraten von Hydroxiden (vOD matrixisolierter HDO Moleküle: 2 074 und 2 244 (H2O I), 2 206 und 2 349 cm−1 (H2O II)). Lattice Vibration Spectra. LXIII. Be(IO3)2 · 4 H2O, a Hydrate with Unusual Bonding and Lattice Dynamics The IR and Raman spectra (4000–50 cm−1) of Be(IO3)2 · 4 H2O and of deuterated specimens are recorded at 90 and 300 K and discussed in terms of the unusual relations of the masses of the atoms involved and the large polarization power of the beryllium ions. Thus, the translatory modes of the Be2+ ions (BeO4 skeleton vibrations), the librations of the H2O molecules, and the internal vibrations of the IO3− ions in the spectral regions of 300–400 and 600–1000 cm−1 couple and coincide producing unusual vH/vD isotopic ratios of partly < 1. The H-bond donor strengths of the water molecules is so much increased (due to the very large ionic potential of Be2+ ions, viz. 49 e nm−1) (synergetic effect) that the H-bonds formed are similar in strength as those in hydrates of hydroxides with the very strong H-bond acceptor group OH− (vOD of matrix isolated HDO molecules 2 074 and 2 244 (H2O I) and 2 206 and 2 349 cm−1 (H2O II))" @default.
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- W1976267989 date "1991-03-01" @default.
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- W1976267989 title "Gitterschwingungsspektren. LXIII. Be(lO3)2 � 4 H2O, ein Hydrat mit ungew�hnlicher Bindungsstruktur und Gitterdynamik" @default.
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- W1976267989 doi "https://doi.org/10.1002/zaac.19915940109" @default.
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