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Structural Variation from 1D to 3D: Effects of Ligands and Solvents on the Construction of Lead(II)–Organic Coordination Polymers
Author(s) -
Yang Jin,
Li GuoDong,
Cao JunJun,
Yue Qi,
Li GuangHua,
Chen JieSheng
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200600730
Subject(s) - chemistry , ligand (biochemistry) , stacking , stereochemistry , chelation , linker , phenazine , crystallography , medicinal chemistry , inorganic chemistry , organic chemistry , receptor , biochemistry , computer science , operating system
A series of Pb II coordination polymers [Pb(ndc)(dpp)] ( 1 ), [Pb(ndc)(ptcp)]⋅0.5 H 2 O ( 2 ), [Pb(ndc)(dppz)] ( 3 ), [Pb(ndc)(tcpn) 2 ] ( 4 ), [Pb 2 (ndc) 2 (tcpp)] ( 5 ), [Pb(Hndc) 2 ]⋅H 2 O ( 6 ), [Pb(ndc)(dma)] ( 7 ), [Pb(bdc)(dma)] ( 8 ), [Pb( trans ‐chdc)(H 2 O)] ( 9 ), and [Pb 2 ( cis ‐chdc) 2 ]⋅NH(CH 3 ) 2 ( 10 ), where ndc=1,4‐naphthalenedicarboxylate, dpp=4,7‐diphenyl‐1,10‐phenanthroline, ptcp=2‐phenyl‐1 H ‐1,3,7,8‐tetraazacyclopenta[ l ]phenanthrene, dppz=dipyrido[3,2‐ a :2′,3′‐ c ]phenazine, tcpn=2‐(1 H ‐1,3,7,8‐tetraazacyclopenta[ l ]phenanthren‐2‐yl)naphthol, tcpp=4‐(1 H ‐1,3,7,8‐tetraazacyclopenta[ l ]phenanthren‐2‐yl)phenol, dma= N , N ‐dimethylacetamide, bdc=1,4‐benzenedicarboxylate, and chdc=1,4‐cyclohexanedicarboxylate, have been synthesized from a hydrothermal or solvothermal reaction system by varying the ligands or the solvents. Compounds 1 – 5 crystallize with an N‐donor chelating ligand and an aromatic dicarboxylate linker. Compounds 1 – 4 are 1D polymers with different π–π stacking interactions, whereas compound 5 consists of 2D layers. The structures of compounds 7 , 8 , and 10 are 3D frameworks formed by connection of the Pb II centers by organic acid ligands. Compound 7 is chiral although the ndc ligand is achiral, while the framework of 8 is a typical 3D (3,4)‐connected net. Compound 10 is the first example of Pb II wheel cluster [Pb 8 O 8 ] units bridged by carboxylate groups. Compound 6 contains 1D chains which are further extended to a 3D structure by π–π interactions. Compound 9 consists of a 2D network constructed by Pb II centers and trans ‐chdc ligands. The structural differences between 7 and 8 and between 9 and 10 indicate the importance of solvents for framework formation of the coordination polymers. By varying the solvent the cis and trans conformations of H 2 chdc in 9 and 10 were separated completely. The photoluminescence and nonlinear optical properties of the coordination polymers have also been investigated.