A neutral rhenium-biimidazole complex for the selective recognition of fluoride ions.

The neutral rhenium(I)-biimidazole complex [Re(CO)(biimH)(1,4-NVP)] (1) was designed and synthesized by a one-pot reaction of Re(CO), 2,2'-biimidazole (biimH) and 4-(1-naphthylvinyl)pyridine (1,4-NVP). The structure of 1 was characterized by various spectroscopic techniques including IR, H NMR, FAB-MS, and elemental analysis and further confirmed by a single-crystal X-ray diffraction analysis. The mononuclear complex 1, a relatively simple structure with an octahedral geometry, is comprised of facial-arranged carbonyl groups, one chelated biimH monoanion, and one 1,4-NVP.

Alkoxy bridged binuclear rhenium (I) complexes as a potential sensor for β-amyloid aggregation.

Alkoxy bridged binuclear rhenium(I) complexes are used as a probe for the selective and sensitive detection of aggregation of β-amyloid fibrils that are consorted with Alzheimer's disease (AD). The strong binding of the complexes is affirmed by the fluorescence enhancement and calculated binding constant value in the order of 10(5)M(-1) is obtained from the Scatchard plots. The binding of β-amyloid can be attributed to π-π stacking interaction of naphthalene moiety present in rhenium(I) complexes, and it is supported by docking studies.

Aggregation-induced emission enhancement in alkoxy-bridged binuclear rhenium(I) complexes: application as sensor for explosives and interaction with microheterogeneous media.

The aggregation-induced emission enhancement (AIEE) characteristics of the two alkoxy-bridged binuclear Re(I) complexes [{Re(CO)3(1,4-NVP)}2(μ2-OR)2] (1, R = C4H9; 2, C10H21) bearing a long alkyl chain with 4-(1-naphthylvinyl)pyridine (1,4-NVP) ligand are illustrated. These complexes in CH2Cl2 (good solvent) are weakly luminescent, but their intensity increased enormously by almost 500 times by the addition of poor solvent (CH3CN) due to aggregation. By tracking this process via UV-vis absorption and emission spectral and TEM techniques, the enhanced emission is attributed to the formation of nanoaggregates.

Control of light-promoted [2+2] cycloaddition reactions by a remote ancillary regulatory group that is covalently attached to rhenium rectangles.

The high-yielding self-assembly of three neutral rhenium(I) rectangles, [Re(2)(CO)(6)(L)(bpe)](2) (1 a, L=2,2'-biimidazolate (biim); 1 b, L=2,2'-bisbenzimidazolate (bbim); 1 c, L=2,2'-bis(4,5-dimethylimidazolate) (bdmim); bpe=trans-1,2-bis(4-pyridyl)ethylene), under hydrothermal conditions is described. The rectangles were structurally characterized by spectroscopic techniques and further confirmed by single-crystal X-ray diffraction. Upon irradiation with a Hg lamp at 365 nm, the bpe ligands of rectangles 1 a and 1 b underwent [2+2] photocycloaddition reactions to produce [{(Re(CO)(3))(2)L}(2)(4,4'-tpcb)(2)] (2 a, L=biim; 2 b, L=bbim; 4,4'-tpcb=1,2,3,4-tetrakis(4-pyridyl)cyclobutane) through a single-crystal-to-single-crystal (SCSC) transformation.