%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