Synthesis and Structure of Vanadium Halide Complexes Containing Diphosphine Ligands with Pendant Amines

Abstract

A series of vanadium(III) diiodide complexes of the formula CpV(P R N R′ P R )I 2 [Cp = η 5 -C 5 H 5 ; P R N R′ P R = (R 2 PCH 2 ) 2 N(R′); R = Et, R′ = Me (1a); R = Et, R′ = Ph (1b); R = Ph, R′ = Me (1c)] is reported. The corresponding vanadium(II) monoiodide complexes of the formula CpV(P R N R′ P R )I [R = Et, R′ = Me (2a); R = Et, R′ = Ph (2b); R = Ph, R′ = Me (2c)] were prepared in THF by reduction of 1a-c with Zn powder. We report the preparation of the vanadium(II) complexes CpV(P Ph 2 N Ph 2 )I (3) (P Ph 2 N Ph 2 = 1,3,5,7-tetraphenyl-1,5-diaza-3,7-diphosphacyclo- [a] 1298 538 mmol) in THF (10 mL). After 1 h, a green precipitate of 1b had formed, and excess zinc powder (0.40 g) was added to the suspen-

Exploring the role of pendant amines in transition metal complexes for the reduction of N2 to hydrazine and ammonia

“…These results motivated our studies to explore vanadium complexes containing pendant amines. We recently synthesized a series of vanadium halide complexes containing diphosphines and pendant amines, according to Scheme 20 [98].…”

Dynamics and Coordination of a P2N2 Ligand – from Twisted Conformation to Chelation

“…The P‐ and N‐atoms‐bearing heterocycle can be combined with various metals in distinct oxidation states [3] . Research activities have particularly focused on cheap and abundant metals such as Mo, [4] Ni [2a,d,5] or Fe [2d,6] while also complexes with Mn, [2d] Co, [7] Cu, [8] V, [9] Cr, [10] W, [11] Pd, [4a] Au, [12] Ru, [13] Rh [14] or Pt [5a,15] were reported. Respective complexes have served as functional models for metalloenzymes, [5c,16] e. g., hydrogenases, [6a] or were used for the oxidation of alcohols [5d] or ammonia, [17] alkyne hydrofunctionalization, [6b] carbon dioxide activation [14] and dinitrogen reduction [10a] or as blue light emitters [8] .…”