Rotationally Active Ligands: Dialing-Up the Co-conformations of a [2]Rotaxane for Metal Ion Binding

被引:35
作者
Baggi, Giorgio [1 ]
Loeb, Stephen J. [1 ]
机构
[1] Univ Windsor, Dept Chem & Biochem, Windsor, ON N9B 3P4, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
co-conformation; coordination chemistry; mechanically interlocked molecules; rotaxanes; INTERLOCKED MACROCYCLIC LIGANDS; DIFFERENT COORDINATING UNITS; T-SHAPED BENZIMIDAZOLIUM; RING-CLOSING METATHESIS; COVALENT BOND FORMATION; MOLECULAR TREFOIL KNOT; HIGH-YIELD SYNTHESIS; TEMPLATE SYNTHESIS; SILVER-NITRATE; ORGANIC FRAMEWORKS;
D O I
10.1002/anie.201607281
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A novel [2]rotaxane was constructed that has a bidentate N,N'-chelate as part of a rigid, H-shaped axle and a 24-membered crown ether macrocycle containing six ether O-atoms and an olefinic group as the wheel. This unique topology produces a ligand with the ability to dial-up different donor sets for complexation to metal ions by simply rotating the wheel about the axle. The solution and solid-state structures of the free ligand and complexes with Li+ and Cu+ show how the ligand adopts different rotational co-conformations for each. The Li+ ion uses the N,N'-chelate and O-donors while the Cu+ center is coordinated to both O-donors and the olefinic group. This concept of rotationally active ligands should be possible with a wide variety of donor sets and could find broad application in areas of coordination chemistry, such as catalysis and metal sequestration.
引用
收藏
页码:12533 / 12537
页数:5
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