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

Edwards, Peter Gerald ORCID:, Newman, Paul David ORCID: and Stasch, Andreas ORCID: 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: 18 Oct 2022 13:08

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