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(Nitro-κN)[2-(phenyldiazenyl-κ N2)-pyridine-κN] (2,2′:6′, 2″-terpyridine-κ3N)ruthenium (II) tetrafluoroborate
Hansongnern,Saeteaw,Cheng,Liao,Lu
, p. 895 - 896 (2001)
The Ru-N bond distances in the title complex, [Ru(NO2)(C11H9N3)(C15 H11N3)]BF4 or [Ru(NO2)(tpy)(azpy)]-BF4, [tpy is 2,2′:6′,2″-terpyridine and azpy is 2-(phenylazo)-pyridine], are Ru-Npy 2.063 (4), Ru-Nazo 2.036 (4), Ru-Nnitro 2.066 (3) A, and Ru-Ntpy 2.082(4), 1.982 (3) and 2.074 (4) A. The azo N atom is trans to the nitro group. The azo N=N bond length is 1.265 (5) A, which is the shortest found in such complexes to date. This indicates a multiple bond between Ru and the N atom of the nitro group, and π-backbonding [dπ(Ru) → π*(azo)] is decreased.
