The rate law for ROCOP using 1, shows a zeroth order in carbon dioxide (1 40 bar), which is consistent with the rapid insertion of CO2 into zinc alkoxide bonds.
14c Thus, CO2 inserts more rapidly into the zinc alkoxide bond than the rate of CL ROP.
Accordingly, the selection of the metal center controls the competing requirements for efficient polymerization, that is, the need for sufficient Lewis acidity to ensure rapid coordination, balanced with an alkoxide bond which is labile to substitution.
This is proposed to be due to rapid insertion of CO2 into the zinc alkoxide bond, coupled with the inability of the zinc carbonate to initiate ROP, by analogy to the previous findings using 1.
[PPN]Cl coordinated to the metal center in the axial site transferred to the propagating metal polymer chain, thereby labilizing the metal alkoxide bond and facilitating the insertion of CO2 [ 3, 6, 17, 18, 21, 24].
Cellulase surfaces are also rich in hydroxyl groups and carboxylic groups, capable of forming multiple bond types, including hydrogen bonds, charged, and partially charged interactions [ 33].
When multiple π bonds are separated from each other by intervening single bonds, they are said to be conjugated.
Multiple hydrogen bonds were existed in LDHs-X system.
The more the number of multiple hydrogen bonds formed, the weaker the strength of single multi-hydrogen bonds was.
Multiple hydrogen bonds will bring stronger interaction between interlayer guest anion and host LDHs-layer than single hydrogen bond.
