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Merck

A novel tetrakis(pyrazolyl)borate ligand bearing triphenylphosphine oxide substituents.

Dalton transactions (Cambridge, England : 2003) (2007-10-24)
Steven Kealey, Nicholas J Long, Andrew J P White, Antony D Gee
ABSTRACT

A new tetrakis(pyrazolyl)borate ligand bearing triphenylphosphine oxide moieties appended to the 3-position of the pyrazolyl rings is reported and shown to display varied coordination chemistry from tridentate N(2)O coordination with thallium to hexadentate N(3)O(3) coordination with europium.

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Sigma-Aldrich
Triphenylphosphine oxide, 98%