Glass-forming metal organic frameworks (MOFs) have novel applications, {but the|however the} origin of their peculiar melting behavior is unclear. {Here|Right here}, we report synchrotron X-ray diffraction electron densities of two zeolitic imidazolate frameworks (ZIFs), the glass-forming Zn-ZIF-zni {and the|and also the|as well as the|along with the|plus the} isostructural thermally decomposing Co-ZIF-zni. Electron density {analysis|evaluation} shows that the Zn‒N bonds are {more|much more|a lot more|far more|additional|extra} ionic than Co‒N bond, which have distinct covalent {features|attributes|functions|characteristics|capabilities|options}. Variable temperature Raman spectra reveal onset of {significant|substantial|considerable|important} imidazolate bond weakening in Co-ZIF-zni above 673 K. Melting {can be|may be|could be|might be|is often|is usually} controlled by tuning the metal–ligand and imidazole bonding strength as shown from nine {solid|strong} {solution|answer|remedy|resolution|option} structures of CoxZn1-x-ZIF-zni (x = 0.{3|three} to 0.003) {were|had been|have been} synthesized, {and a|along with a|as well as a|plus a|and also a|in addition to a} mere 4% Co-doping into Zn-ZIF-zni {results|outcomes|final results|benefits} in thermal decomposition {instead|rather|as an alternative|alternatively} of melting. These findings advocate {significant|substantial|considerable|important} chemical space for de-signing new MOF glasses either by engineering the chemical bonding with ligand functionalization or by avoiding defects {at the|in the} metal {site|website|web site|internet site|web-site|web page} {in the|within the|inside the} crystal lattice. Buy874-20-4 Boc-NH-PEG2-C2-NH2 manufacturer PMID:23659187
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