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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/125/04/0715-0721

    • Keywords

       

      Dinuclear lead(II); Schiff base; terephthalate bridge; hemidirected structures; luminescence.

    • Abstract

       

      One-pot synthesis using a 2:2:1:2 molar ratio of Pb(OAc)2·3H2O, L, piperidinum terephthalate (ptp) and NaClO4/NH4PF6 at room temperature affords two dinuclear compounds of the type [Pb2(L)2(𝜇- tp)](ClO4/PF6)2 (1/2) [L=N,N'-(bis-(pyridin-2-yl)benzylidene)diethylenetriamine and tp = terephthalate dianion]. The compounds are characterized by microanalytical, spectroscopic, thermal and other physicochemical results. X-ray structural analyses of 1 and 2 reveal that each heptacoordinated lead(II) centre with a PbN5O2 chromophore are bound by five N atoms of L and connected through O atoms of a bis(bidentate) tp bridge. The arrangements of L and tp suggest a gap around the metal centre due to occupation of a stereo-active lone pair of electrons reflecting a hemidirected coordination around the metal centre. The complexes exhibit reasonable thermal stabilities with the tolerate temperatures ca. 255°C for 1 and 263°C for 2. The complexes display intraligand ($\pi-\pi^\ast$) fluorescence in the solid state and in DMF solutions at room temperature.

    • Author Affiliations

       

      Subhasis Roy1 Somnath Choubey1 Sumitava Khan1 Kishalay Bhar1 Partha Mitra2 Barindra Kumar Ghosh1

      1. Department of Chemistry, The University of Burdwan, Burdwan 713 104, India
      2. Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India
    • Dates

       
  • Journal of Chemical Sciences | News

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