THE SYNTHESIS, CRYSTAL, MOLECULAR AND ELECTRONIC STRUCTURES OF TRIBROMO(NITROSYL)BIS(TRIPHENYLPHOSPHINE OXIDE) RHENIUM(II) AND TRIBROMO(NITROSYL)BIS(TRIPHENYLPHOSPHINE)RHENIUM(I)

Synthesis and spectroscopic investigation of the pyrazole complexes. The X-ray structure of [ReOBr 3 (OAsPh 3 )(pzH)]

“…We have found that the easily available mononuclear [ReOX 3 (OAsPh 3 )(AsPh 3 )] complexes (X ¼ Br, Cl) [6] are excellent starting materials in the synthesis of nitrosyl derivatives [7]. Now, continuing our research on chemistry of [ReOX 3 (OAsPh 3 )(AsPh 3 )] compounds we have explored their reactivity towards pyrazole, which is capable of coordinating in both monodentate and an exo-or endobidentate modes [8].…”

Unexpected formation of a new nitrosylrhenium(II) complex from oxorhenium(V)

“…The most general method of preparation is the reductive nitrosylation of perrhenate or oxorhenium(V) compounds by gaseous nitric oxide or alkaline hydroxylamine [4,5]. For example, the rhenium(II) complex [Re(NO)Br 3 (PPh 3 ) 2 ] was isolated from the reaction of trans-[ReOBr 3 (PPh 3 ) 2 ] with gaseous nitric oxide in the presence of excess free PPh 3 in benzene [6].This report describes the unexpected formation of the nitrosylrhenium(II) complex salt [Re(NO)BrL 2 (PPh 3 ) 2 ]-(ReO 4 ) (1), which was isolated from the reaction of trans-[ReOBr 3 (PPh 3 ) 2 ] with 2-(benzo[d]oxazol-2-yl)benzenamine (bba) in methanol [7]. N O H 2 N O NH P Ø Ø Ø bba L 2…”

Synthesis, crystal, molecular and electronic structure of rhenium nitrosyl with pyrazole in the coordination sphere

“…The rhenium atom is in a distorted octahedral environment with the bromine ligands in meridional geometry and the linear N-O group is trans to the pyrazole molecule and cis to the PPh 3 ligand. The nitrosyl group of the starting complex occupies the trans position to one of the bromine [17][18][19][20][21][22][23][24][25]. The linearly bonded nitrosyl ligand is a poor r-donor and a very strong p-acceptor.…”

“…The [ReOX 3 L 2 ] compounds (X = Cl and Br, L = PPh 3 , AsPh 3 , 1/2 dppe) easily reacts with gaseous nitric oxide to give a variety of products depending on the reaction conditions: [ReX 3 [17][18][19][20][21][22][23][24][25].…”

“…Due to the favourable nuclear properties of 186 Re and 188 Re nuclides in diagnostic nuclear medicine and radioimmunotherapy, the chemistry of nitrosyl rhenium complexes arouses particular interest [15,16]. [17][18][19][20][21][22][23][24][25].Here, we present the synthesis, spectroscopic characterization, crystal, molecular and electronic structure of a new rhenium nitrosyl with pyrazole (pzH) in a coordination sphere -[ReBr 3 (NO)(PPh 3 )(pzH)]. The electronic 1387-7003/$ -see front matter Ó…”