Syntheses, molecular and crystalline architectures, and luminescence behaviour of terephthalate bridged heptacoordinated dinuclear lead(II) complexes containing a pentadentate N-donor Schiff base

Journal of Chemical Sciences

Partha Mitra¹  Subhasis Roy²  Kishalay Bhar²  Somnath Choubey²  Barindra Kumar Ghosh1²  Sumitava Khan² 

[1] Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India$$;Department of Chemistry, The University of Burdwan, Burdwan 713 104, India$$

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

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

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 (𝜋-𝜋*) fluorescence in the solid state and in DMF solutions at room temperature.

【 授权许可】

Unknown