The regioselective 1,3-dipolar cycloaddition reaction of alkoxy alkynyl Fischer carbene complex 1 with azidomethyl ferrocene 2 and with azidomethyl pyrene 4 under solvent-free conditions yielded the triazolyl Fischer carbene complexes 3 (C 27 H 21 O 6 N 3 FeW) and 5 (C 33 H 21 O 6 N 3 W), respectively. The cation complexation properties of these receptors have been systematically studied using electrochemical and spectroscopic techniques. The exceptional structural feature existing in these receptors is the presence of a Fischer carbene moiety, connected to the ferrocene or pyrene moiety through a 1,2,3-triazole ring. Receptor 3 contains a redox-active ferrocene moiety and is highly selective toward Pb 2+ ion, whereas receptor 5, having a fluorescent pyrene unit, selectively recognizes Zn 2+ and Cu 2+ ions. The binding ability of receptor 3 can be inferred either from the redox shift (the anodic shift ΔE 1/2 = 55 mV) or the highly visual output response for Pb 2+ ion. Receptor 5 displays considerable chelationenhanced fluorescence (CHEF) upon binding with Zn 2+ and Cu 2+ ions in an aqueous environment. Further, the proposed binding modes of these receptors and their metal cation complexation properties have been supported by 1 H NMR titration and MALDI-MS and a DFT study.

A series of B←N coordinated tetrahydrodibenzo­[a,i]­phenanthridine-based polycyclic aromatic hydrocarbons (PAHs) have been designed and synthesized. All of these compounds have been characterized by multinuclear NMR spectroscopy and high-resolution mass spectrometry. Compounds 1, 2, 4, and 7 have also been characterized by single-crystal X-ray diffraction analysis. Our newly synthesized compounds exhibit good luminescence quantum yields in solution and moderate quantum yields in the solid state. Furthermore, the compounds show a large Stokes shift in comparison to the well-known boron–dipyrromethene dyes.

Synthesis and sensing properties of 1,19-disubstituted unsymmetrical ferrocene-triazole derivatives: a multichannel probe for Hg(II) ion3

A metallaborane of novel structure, [(Cp*Mo)(2)B(3)H(3)Se(2){Fe(CO)(2)}(2){Fe(CO)(3)}(2)] (2; Cp* = η(5)-C(5)Me(5)), with tetracapped pentagonal bipyramidal geometry, isolated from the reaction of [(Cp*Mo)(2)B(4)H(4)Se(2)], 1 with [Fe(2)(CO)(9)]; the title compound exhibit an 11-vertex closo-cage geometry, having eight skeletal electron pairs (sep) and 98 valence electrons, appropriate for its geometric structure.

Absorption of water by a ferrocene–quinoline conjugate shows H-bonded 3D-networks of water in the molecular pockets and it acts as an efficient proton conductor.