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Synthesis of Various Cationic Ruthenium−Aqua Complexes with Hydrotris(3,5-diisopropylpyrazolyl)borate Ligand, TpiPrRu(OH2)n(L)3-n·(CF3SO3)(THF)x, and Their Structures Supported by Hydrogen-Bonding Networks1

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posted on 1998-06-05, 00:00 authored by Yoshiaki Takahashi, Munetaka Akita, Shiro Hikichi, Yoshihiko Moro-oka
The labile cationic aqua complex, TpiPrRu(OH2)2(THF)·(OTf)(THF)2, 2, containing the hydrotris(3,5-diisopropylpyrazolyl)borate ligand (TpiPr), is prepared by protonolysis of the ruthenium pentahydride complex TpiPrRuH5, 1, with trifluoromethanesulfonic acid (TfOH) in THF. Treatment of 2 with various 2e and 4e donors results in displacement of the THF and aqua ligands to give TpiPrRu(OH2)n(L)3-n·(OTf)(THF)x, 36 (L= py, bipy, phen, pziPr-H, PPh3, dppe, MeCN, tBuCN, CC(H)Ph; n = 0−2), and thus, complex 2 serves as a versatile precursor for a variety of cationic ruthenium aqua complexes. X-ray crystallographic analysis of the di- (2, 3b,c) and monoaqua complexes (4c, 5) reveals ternary hydrogen-bonding networks among the aqua, OTf-, and THF fragments.

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