期刊
INORGANIC CHEMISTRY
卷 58, 期 23, 页码 16227-16235出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.9b02761
关键词
-
资金
- National Science Foundation [CHE 1847878, CHE 1606558, NMR: CHE 1048553, CHE 1606556, NMR: CHE 0957080, HR-MS: CBET 0958711]
Supramolecular assembly utilizing simultaneous formation of three pnictogen bonds around a single antimony vertex was explored via X-ray crystallography, solution NMR, and computational chemistry. An arylethynyl (AE) ligand was designed to complement the three electrophilic regions around the Sb compound. Though solution studies reveal large binding constants for individual pyridyl units with the Sb donor, the rigidity and prearrangement of the AE acceptor proved necessary to achieve simultaneous binding of three acceptors to the Sb-centered pnictogen-bond donor. Calculations and X-ray structures suggest that negative cooperativity upon sequential binding of three acceptors to a Sb center limits the utility of triple-pnictogen bonding pyridyl acceptors. These limitations can be negated, however, when positive cooperativity is designed into a complementary acceptor ligand.
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