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- W2157436895 abstract "A total of three distinctive main group and transition metal complexes containing the 2-pyridyl pyrazolate (pypz) ligand were prepared, namely, [B(C6F5)2(pypz)] (1), [Ru(CO)2(pypz)2] (2), and [Os(CO)2(pypz)2] (3), where (pypz)H = 3-trifluoromethyl-5-(2-pyridyl)pyrazole. Single-crystal X-ray diffraction studies were carried out on complexes 2 and 3, revealing octahedral coordination geometry with two CO ligands located at cis dispositions. While the pypz ligand arrangement for complex 2 is in cis-(Npy,Npy) and trans-(Npz,Npz), complex 3 reveals a different configuration, cis-(Npz,Npz) and trans-(Npy,Npy) (Npy for pyridine-N and Npz for pyrazolate donor sites). Similar to that of the in-situ-prepared pypz anion, the boron complex [B(C6F5)2(pypz)] (1) exhibits a strong emission centered at 380 nm, which is unambiguously assigned to fluorescence derived from the S1(ππ*) → S0 transition. In contrast to the nonluminescent behavior for Ru complex 2, the Os complex 3 displays unique, strong room-temperature phosphorescence, showing vibronic progressions at 430, 457, and 480 nm. The remarkable differences in photophysical properties were rationalized by a combination of π-electron accepting CO ligand, relative pypz orientation, and heavy-atom-enhanced spin−orbit coupling effects." @default.
- W2157436895 created "2016-06-24" @default.
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- W2157436895 date "2003-10-24" @default.
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- W2157436895 title "Synthesis and Characterization of Metal Complexes Possessing the 5-(2-Pyridyl) Pyrazolate Ligands: The Observation of Remarkable Osmium-Induced Blue Phosphorescence in Solution at Room Temperature" @default.
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- W2157436895 doi "https://doi.org/10.1021/om034037e" @default.
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