Abstract

The Zn[(OPPh 2)(SePPh 2)N] 2 complex was prepared by a metathetical reaction between a Zn(II) salt and the deprotonated form of the dichalcogenoimidodiphosphinato ligand [(OPPh 2)(SePPh 2)N] −. X-ray crystallography revealed a pseudo-tetrahedral MO 2Se 2 coordination sphere, owed to the asymmetric (O,Se) nature of the chelating ligand. A comparison between the structural features of the M[(OPPh 2)(SePPh 2)N] 2 complexes, M = Co, Ni, Zn, shows that the three complexes are isomorphous. The IR and 31P NMR properties of Zn[(OPPh 2)(SePPh 2)N] 2 are analyzed in the framework of its crystallographic structure, and are compared with data on similar systems. The above three complexes, along with the (OPPh 2)(SePPh 2)NH ligand and SeO 2, are investigated as inhibitors of the Platelet Activating Factor (PAF) and thrombin activities. The paramagnetic M[(OPPh 2)(SePPh 2)N] 2 complexes, M = Co, Ni, exhibit an approximately 65-fold increased activity, compared to diamagnetic Zn[(OPPh 2)(SePPh 2)N] 2, in both the PAF- and the thrombin-induced aggregation of washed rabbit platelets (WRP). The above three complexes show a comparable significant inhibitory activity in the PAF-induced aggregation of rabbit platelet rich plasma (RPR). Remarkably, SeO 2, a form of Se present in blood, exhibits a very strong and selective inhibitory activity towards the PAF-induced aggregation of WPR. Our studies extend the dataset of metal complexes investigated as inhibitors of PAF and thrombin.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.