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Substituent and Temperature Effect on the Assemblies of Three Lead(II) Coordination Polymers based on Asymmetrical Biphenyl Tritopic Ligands
Author(s) -
Li ZhiSen,
Li XiuYuan,
Liu JingWei,
He Tian,
Yue KeFen
Publication year - 2015
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201500621
Subject(s) - sbus , substituent , thermogravimetric analysis , chemistry , biphenyl , crystallography , infrared spectroscopy , benzoic acid , pyridine , powder diffraction , hydrothermal circulation , metal , metal organic framework , stereochemistry , medicinal chemistry , organic chemistry , geology , adsorption , seismology
Three Pb‐based metal‐organic frameworks, [Pb 6 (L1) 4 ] · H 2 O ( 1 ), [Pb 2 (L2) 2 (H 2 O)] · H 2 O ( 2 ), and [Pb(L2)(H 2 O)] · H 2 O ( 3 ) were constructed based on two asymmetrical tritopic ligands, 3‐(2′,5′‐dicarboxylphenyl)benzoic acid (H 3 L1) and 3‐(2′,5′‐dicarboxylphenyl)pyridine acid (H 2 L2), under hydrothermal conditions. The substituents on the two ligands and the induced temperature had effects on the resulting structures. All of the complexes were structurally characterized by X‐ray diffraction analyses and further identified by infrared spectra, elemental analyses, powder X‐ray diffraction, and thermogravimetric analyses. Complexes 1 and 3 are 3D frameworks, which construct from 1D inorganic Pb–O–Pb rod‐shaped secondary building units (SBUs) and H 3 L1/H 2 L2 ligands as pillars. Complex 2 is a 3D framework based on discrete tetranuclear Pb 4 (COO) 8 clusters SBUs and H 2 L2 ligands. The effects of both the substituent groups on the aromatic rings and the reaction temperature are discussed in details. The fluorescence properties and thermal stabilities of complexes 1 – 3 were also measured.