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Updated: Jul 13, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Synthesis, structure, and LLCT transitions in terminal hydrazido(2-) bipyridine complexes of titanium
Sameer Patel1, Yahong Li, Aaron L Odom
1Michigan State University, Department of Chemistry, East Lansing, MI 48824, USA.
Abstract:
Addition of 2,2'-bipyridine and its derivatives to Ti(NMe2)2(dpma), where dpma is N,N-di(pyrrolyl-alpha-methyl)-N-methylamine, followed by various hydrazine derivatives was used to generate a series of terminal hydrazido(2-) complexes. Among the new complexes is Ti[=NN(H)Ph](But-bpy)(dpma), which was structurally characterized, where But-bpy is 4,4'-tert-butyl-2,2'-bipyridine. Other new complexes reported are Ti(NNMe2)(Me-bpy)(dpma), Ti(NNMe2)(bpy)(dpma), Ti(NNMe2)(Ph-bpy)(dpma), Ti[NN(Me)Ph](But-bpy)(dpma), Ti[NN(Me)p-tolyl](But-bpy)(dpma), and Ti[NN(Me)4-FC6H4](But-bpy)(dpma). Titanium hydrazido(2-) complexes bearing bpy substituents possess a low-energy transition, leading them to have blue or green colors, which is somewhat unusual for titanium(IV) species. Through absorption studies on the derivatives, it was determined that the low-energy transition is the result of an unusual ligand-to-ligand charge transfer where electron density residing on the hydrazido(2-) is transferred to the bpy pi* orbitals.
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