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Coordination chemistry of an asymmetric P,N,O tridentate ligand containing primary phosphine, amine and alcohol donors

Edwards, Peter Gerald, Newman, Paul David and Stasch, Andreas 2011. Coordination chemistry of an asymmetric P,N,O tridentate ligand containing primary phosphine, amine and alcohol donors. Journal of Organometallic Chemistry 696 (8) , pp. 1652-1658. 10.1016/j.jorganchem.2011.01.031

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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(C2H3)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(κ2-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)]BF4 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Heterodonor; Asymmetric; Tridentate; Phosphine; Amine; Alcohol
Publisher: Elsevier
ISSN: 0022-328X
Last Modified: 09 Jun 2020 01:34

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