PMID- 31532195
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20191015
LR  - 20191015
IS  - 1520-510X (Electronic)
IS  - 0020-1669 (Linking)
VI  - 58
IP  - 19
DP  - 2019 Oct 7
TI  - Thiazolothiazole-Based Luminescent Metal-Organic Frameworks with Ligand-to-Ligand 
      Energy Transfer and Hg(2+)-Sensing Capabilities.
PG  - 12707-12715
LID - 10.1021/acs.inorgchem.9b01595 [doi]
AB  - Photoinduced electron and energy transfer through preorganized chromophore, 
      donor, and acceptor arrays are key to light-harvesting capabilities of 
      photosynthetic plants and bacteria. Mimicking the design principles of natural 
      photosystems, we constructed a new luminescent pillared paddle wheel 
      metal-organic framework (MOF), Zn(2)(NDC)(2)(DPTTZ), featuring naphthalene 
      dicarboxylate (NDC) struts that served as antenna chromophores and energy donors 
      and N,N'-di(4-pyridyl)thiazolo-[5,4-d]thiazole (DPTTZ) pillars as complementary 
      energy acceptors and light emitters. Highly ordered arrangement and good overlap 
      between the emission and absorption spectra of these two complementary energy 
      donor and acceptor units enabled ligand-to-ligand Forster resonance energy 
      transfer, allowing the MOF to display exclusively DPTTZ-centric blue emission 
      (410 nm) regardless of the excitation of either chromophore at different 
      wavelengths. In the presence of Hg(2+), a toxic heavy metal ion, the 
      photoluminescence (PL) of Zn(2)(NDC)(2)(DPTTZ) MOF underwent significant 
      red-shift to 450 nm followed by quenching, whereas other transition metal ions 
      (Mn(2+), Fe(2+), Co(2+), Ni(2+), Cu(2+), and Cd(2+)) caused only fluorescence 
      quenching but no shift. The free DPTTZ ligand also displayed similar, albeit less 
      efficient, fluorescence changes, suggesting that the heavy atom effect and 
      coordination of Hg(2+) and other transition metal ions with the DPTTZ ligands 
      were responsible for the fluorescence changes in the MOF. When exposed to a 
      mixture of different metal ions, including Hg(2+), the MOF still displayed the 
      Hg(2+)-specific fluorescence signal, demonstrating that it could detect Hg(2+) in 
      the presence of other metal ions. The powder X-ray diffraction studies verified 
      that the framework remained intact after being exposed to Hg(2+) and other 
      transition metal ions, and its original PL spectrum was restored upon washing. 
      These studies demonstrated the light-harvesting and Hg(2+) sensing capabilities 
      of a new bichromophoric luminescent MOF featuring a seldom-used photoactive 
      ligand, which will likely spark an explosion of TTZ-based MOFs for various 
      optoelectronic applications in near future.
FAU - Khatun, Amina
AU  - Khatun A
AD  - Department of Chemistry , Clemson University , 211 South Palmetto Boulevard , 
      Clemson , South Carolina 29634 , United States.
FAU - Panda, Dillip K
AU  - Panda DK
AD  - Department of Chemistry , Clemson University , 211 South Palmetto Boulevard , 
      Clemson , South Carolina 29634 , United States.
FAU - Sayresmith, Nickolas
AU  - Sayresmith N
AD  - Department of Chemistry , University of North Carolina Charlotte , 9201 
      University Center Boulevard , Charlotte , North Carolina 28228 , United States.
FAU - Walter, Michael G
AU  - Walter MG
AUID- ORCID: 0000-0002-9724-265X
AD  - Department of Chemistry , University of North Carolina Charlotte , 9201 
      University Center Boulevard , Charlotte , North Carolina 28228 , United States.
FAU - Saha, Sourav
AU  - Saha S
AUID- ORCID: 0000-0001-6610-4820
AD  - Department of Chemistry , Clemson University , 211 South Palmetto Boulevard , 
      Clemson , South Carolina 29634 , United States.
LA  - eng
PT  - Journal Article
DEP - 20190918
PL  - United States
TA  - Inorg Chem
JT  - Inorganic chemistry
JID - 0366543
SB  - IM
EDAT- 2019/09/19 06:00
MHDA- 2019/09/19 06:01
CRDT- 2019/09/19 06:00
PHST- 2019/09/19 06:00 [pubmed]
PHST- 2019/09/19 06:01 [medline]
PHST- 2019/09/19 06:00 [entrez]
AID - 10.1021/acs.inorgchem.9b01595 [doi]
PST - ppublish
SO  - Inorg Chem. 2019 Oct 7;58(19):12707-12715. doi: 10.1021/acs.inorgchem.9b01595. 
      Epub 2019 Sep 18.