%0 Journal Article %A Gao, Xu-Sheng %A Dai, Hai-Jie %A Ding, Mei-Juan %A Pei, Wen-Bo %A Ren, Xiao-Ming %D 2019 %T Stereochemically Active and Inactive Lone Pairs in Two Room-Temperature Phosphorescence Coordination Polymers of Pb2+ with Different Tricarboxylic Acids %U https://acs.figshare.com/articles/journal_contribution/Stereochemically_Active_and_Inactive_Lone_Pairs_in_Two_Room-Temperature_Phosphorescence_Coordination_Polymers_of_Pb_sup_2_sup_with_Different_Tricarboxylic_Acids/8101262 %R 10.1021/acs.inorgchem.9b00215.s001 %2 https://acs.figshare.com/ndownloader/files/15112886 %K powder X-ray diffraction %K H 3 BTC %K structure forms %K coordination polymers %K room temperature %K 0 O 2 type %K DMF %K HBTC %K 2 show %K decay lifetimes %K electron pair %K H 3 PTC %K quantum yields %K solvothermal condition %K PXRD %K hemidirected coordination sphere %K Inactive Lone Pairs %K CP %K holo-directed coordination geometry %K 1.52 ms %K Different Tricarboxylic Acids %K 1 O 2 type %K Room-Temperature Phosphorescence Coordination Polymers %K gravimetric analyses %K TGA %K coordination sphere %K IR %K 0.73 ms %K Pb 2 %K coordination frameworks %X Two new Pb2+-based coordination polymers (CPs), [Pb2(HBTC)2(DMF)] (1) and [Pb­(HPTC)] (2), have been synthesized under solvothermal condition; herein, H3BTC and H3PTC represent 1,3,5-benzenetricarboxylic acid and 2,4,6-pyridine tricarboxylic acid, respectively. Both 1 and 2 were characterized by microanalysis, infrared spectra (IR), thermal gravimetric analyses (TGA), and powder X-ray diffraction (PXRD) techniques. Single-crystal structural analysis indicates that 1 and 2 show different coordination sphere around Pb2+ ions and distinct coordination frameworks. The I1O2 type three-dimensional (3D) nonporous metal–organic framework forms in 1, where the Pb2+ ion shows holo-directed coordination geometry, while the I0O2 type two-dimensional (2D) coordination polymeric layered structure forms in 2, where Pb2+ ion shows a hemidirected coordination sphere and the 6s2 lone electron pair in Pb2+ ion is stereochemically active. The two CPs emit intense and long-lasting greenish phosphorescence in air at room temperature, with absolute quantum yields of 1.2% for 1 and 4.7% for 2 and decay lifetimes of 0.73 ms for 1 and 1.52 ms for 2. %I ACS Publications