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Spin Crossover Studies on Bis{hydro‐tris(1,2,4‐triazolyl)borato}iron(II)

1998; Wiley; Volume: 624; Issue: 5 Linguagem: Inglês

10.1002/(sici)1521-3749(199805)624

1521-3749

Christoph Janiak, Tobias G. Scharmann, Thomas Bräuniger, Jana Holubová, Milan Nádvornı́k,

Metal-Catalyzed Oxygenation Mechanisms

Abstract. The spin-crossover behavior of bis{hydro-tris(1,2,4-triazolyl)borato}iron(II) is investigated in bulk and as a mag-netically diluted sample in the solid state and in solution asa function of temperature by magnetic susceptibility mea-surements and differential scanning calorimetry. In aqueoussolution the low-spin to high-spin transition is shown in turnto decrease the longitudinal relaxation time T 1 of water pro-tons with increasing temperature. The solid-state magneti-cally diluted samples were prepared by cocrystallization withthe isostructural zinc complex.Keywords: Spin Crossover; Magnetic Measurements; Iron(II)Compound; Nuclear Magnetic Resonance, T 1 -measurements;Poly(pyrazolyl)borate ligand, modified Spincrossover-Untersuchungen an Bis{hydro-tris(1,2,4-triazolyl)borato}eisen(II) Inhaltsverzeichnis. Das Spincrossover-Verhalten vonBis{hydro-tris(1,2,4-triazolyl)borato}eisen(II) wurde in Rein-substanz und in magnetischer Verdu¨nnung im Festko¨rperund in Lo¨sung als Funktion der Temperatur mit Hilfe vonmagnetischen Suszeptibilita¨tsmessungen und der dynami-schen Differenzkalorimetrie (DSC) untersucht. Es wurde au-serdem gezeigt, das in wa¨sriger Lo¨sung durch den low-spin – high-spin Ubergang im Gegenzug die longitudinaleRelaxationszeit T