1291485-53-4Relevant academic research and scientific papers
Coordination chemistry of an asymmetric P,N,O tridentate ligand containing primary phosphine, amine and alcohol donors
Edwards, Peter G.,Newman, Paul D.,Stasch, Andreas
, p. 1652 - 1658 (2011)
The asymmetric, heterodonor tridentate ligand 2(S)-amino-4-phosphinobutan- 1-ol, S-PNO, has been prepared from (S)-aspartic acid and some aspects of its coordination chemistry with a number of metal complexes investigated. Reaction of S-PNO with appropriate metal precursors led to the isolation of the complexes fac-Cr(CO)3(κ3-S-PNO), 1, fac-[Mn(CO) 3(κ3-S-PNO)]PF6, 2, and fac-[Re(CO) 3(κ3-S-PNO)]BF4, 3. The alcohol and amine donors in fac-Cr(CO)3(κ3-S-PNO) were substituted upon addition of trivinylphosphine to 1 to give the complex fac-Cr(CO) 3(κ1-P-S-PNO){P(C2H3) 3}2, 4. Addition of base to 4 gave a coordinated linear tridentate P3 ligand through the formation of two new chelate rings via hydrophosphination of one vinyl group on each coordinated P(C 2H3)3 with the P-H bonds of the complexed S-PNO. The alcohol donor in fac-[Re(CO)3(κ3-S-PNO)] BF4 is labile and can be substituted with tris(2-fluorophenyl) phosphine, PAr3F, to give fac-[Re(CO)3(κ 2-P,N-S-PNO)(PAr3F)]BF4, 5. Attempts to form a macrocyclic ligand through addition of base to fac-[Re(CO) 3(κ2-P,N-S-PNO)(PAr3F)]BF 4 were unsuccessful due to loss of PAr3F prior to any ring-closure. All the complexes have been fully characterised by spectroscopic and analytical techniques including a single-crystal X-ray structure analysis of 2.
