The Syntheses, Crystal Structure, and Exceptional Chemical Stability of Three Multinuclear Pb^II Complexes

Abstract

Three multinuclear Pb II complexesϪ[Pb 2 (ptptp) 2 (H 2 O) 2 ] (1), [Pb 2 (p-PDA)(Hptptp) 2 ] (2), and [Pb 4 (o-PDA) 2 (ptptp) 2 ]·2H 2 O (3) [H 2 ptptp = 2-(5-{6-[5-(pyrazin-2-yl)-1H-1,2,4-triazol-3-yl]pyridin-2-yl}-1H-1,2,4-triazol-3-yl)pyrazine, H 2 PDA = phenylenediacetic acid]Ϫhave been synthesized under hydrothermal conditions. Complexes 1, 2, and 3 show di-, di-, and tetranuclear structures, respectively. The study of the chemical stability of the three complexes demonstrates their re- [a]438 markable chemical resistance to boiling water and organic solvents. More importantly, complex 1 shows remarkable acid and alkali resistance, which is outstanding among metal-organic solids. The thermogravimetric analysis curve shows that complex 1 possesses high thermal stability (up to 491°C). Furthermore, the fluorescence of complexes 1, 2, and 3 has also been investigated.

Water Stability and Adsorption in Metal–Organic Frameworks

“…However, if use of these structures under higher humidity conditions is desired, the strategies discussed in section 5.2 can be used to modify the structure to improve its water stability. These unstable structures exhibit both labile metal clusters and an absence of any kinetic factors that provide a significant barrier 264 high PCN-224(M) 266 high ZIF-8 28,62,63,105,293 Zn(MEIM) 2 high Al-PMOF 303 TCPP(AlOH) 2 medium JUC-110 93 Cd(HTHIPC) 2 medium MIL-100(Cr) 38,39,63 Cr 3 OX(BTC) 2 , X = OH, F medium MONT1 304 Cu 2 (PCP) 2 BIPY medium N/A 305 Pb 2 common name activated formula unit a confidence CALF-25 60 BaH 2 L high CAU- 10 110 Al(OH)(ISO) high DUT-51(Hf) 55 Hf 6 O 6 (OH) 2 (DTTDC) 4 high DUT-51(Zr) 55 Zr 6 O 6 (OH) 2 (DTTDC) 4 high DUT-67(Zr) 56,110 Zr 6 O 6 (OH) 2 (TDC) 4 high FMOF-1 92 Ag(TZ) high MIL-100(Al) 37,299 Al 3 OX(H 2 O) 2 (BTC) 2 , X = F, OH high MIL-100(Fe) 28,37,41,42,44 Fe 3 OX(H 2 O) 2 (BTC) 2 , X = F, OH high MIL-101-NH2(Cr) 51,52 Cr 3 F(H 2 O) 2 O(BDC-NH 2 ) 3 high MIL-125-NH 2 (Ti) 46−48 Ti 8 O 8 (OH) 4 (BDC-NH 2 ) 6 high MIL-127 42 Fe 6 O 2 (TAZB) 3 X 2 , X = Cl, OH high MIL-53(Al) 62,268,307 Al(OH)(BDC) high MIL-53(Cr) 268 Cr(OH)BDC high MOF-525 265 Zr 308,309 Zn 2 (BDC) 2 (2,2′-dimethyl-BPY) high UiO...…”

A Sr 2+ -metal–organic framework with high chemical stability: synthesis, crystal structure and photoluminescence property

“…The differences between the experimental PXRD and the simulated one in diffraction intensities may be attributed mainly to the preferred orientation of the lattice face of the powder sample, and the slight peak shifts in the low-angle region of PXRD may be the result of the solvent effect [28,29]. In particular, NKU-105 is also tested for their resistance to acid and base by sinking them into aqueous solution with pH values ranging from 2 to 13 for 24 h. The stability of the MOFs depends greatly on the stability of the inorganic units as well as the strength of the chemical bonding [31]. In accordance with this viewpoint, the high chemical stability of NKU-105 can be ascribed to the following factors: first, the strong ionic bond between Sr 2+ and carboxylate groups is one of the vital factors contributing to the high chemical stability [32,33].…”