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1D Helical Single‐Crystal to 3D Lonsdaleite Single‐Crystal Transformation of Copper(II)‐Based Coordination Polymer: Acetone Fluorescence Sensing and CO 2 Gas Separation
Author(s) -
Sasikala Vadivel,
Sundar Jeyaperumal Kalyana,
Lakshmi Muppudathi Anna
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201803835
Subject(s) - sorption , single crystal , coordination polymer , analytical chemistry (journal) , copper , thermal stability , crystal (programming language) , adsorption , absorption (acoustics) , materials science , powder diffraction , crystallography , chemistry , crystal structure , organic chemistry , computer science , programming language , composite material
The temperature‐driven 1D helical single‐crystal (1) to 3D lonsdaleite (2) single‐crystal transformation of copper‐based coordination polymer has been investigated. Powder X‐ray diffraction experiments showed that the phase transitions described for single crystals also occur in the powder samples. The thermal stability of the compounds were studied by Differential Scanning Calorimetric (DSC) and thermal gravimetric (TG) analyses indicates, there is no coordination water molecules were present in the 2 also thermal stability increased. In UV‐Vis absorption spectra, compound 2 has blue shift compared to 1 due to partial decrease in the number of electrons surrounding Cu 2+ ion and the geometry around Cu 2+ center after loss of H 2 O. Interestingly both compounds showed the tremendous luminescent enhancement for acetone in the visible region and detection limit of 2 was 4.04x10 −9 M is much better than its threshold limit recommended by WHO. Porous natures of the compounds were analyzed by theoretical and experimentally. BET sorption analyze indicated both crystal phases selectively adsorb CO 2 over N 2. Therefore, this compounds, promising material for acetone sensor, selective sorption, separation of CO 2 from industrial flue gas or the removal of CO 2 from natural gas.