Novel Arene Receptors as Nitric Oxide (NO) Sensors
摘要:
Nitric oxide sensors are based on the reversible, specific, and efficient binding to various types of arene receptors via intermolecular complexes, which are characterized by complete electron delocalization and strong interaction between the donor and acceptor moieties.
Silver(I) Complexation of (Poly)aromatic Ligands. Structural Criteria for Depth Penetration into <i>cis</i>-Stilbenoid Cavities
作者:S. V. Lindeman、R. Rathore、J. K. Kochi
DOI:10.1021/ic000770b
日期:2000.12.1
Silver(I) complexes with aromatic donors an thoroughly analyzed (with aid of the Cambridge Crystallographic Database) to identify the basic structural factors inherent to the bonding of an arene ligand. Most strikingly, the distance parameter d (which simply measures the normal separation of Ag from the mean aromatic plane) is singularly invariant at d = 2.41 +/- 0.05 Angstrom for all silver/arene complexes, independent of the hapticity (eta (1) or eta (2)), hybridization, or multiple coordination. As such, a systematic series of stilbenoid ligands has been successfully designed to precisely modulate the penetration of silver(I) into the ligand cleft, and a multicentered poly(arene) ligand (X) designed to form a one-dimensional assembly of Ag/arene units. Simply stated, the depth penetration of silver(I) into the aromatic cavities of various cis-stilbenoid donors can be precisely predicted with a single parameter gamma that measures the separation of the two cofacial aryl groups comprising the cleft. This simple geometric consideration must be taken into account in any successful-design of novel (poly)aromatic ligands for silver(I) complexation to constitute new molecular architectures.