Self-Assembly of an Octanuclear Platinum(II) Tetragonal Prism from a New Pt^II₄ Organometallic Star-Shaped Acceptor and Its Nitroaromatic Sensing Study

[2 + 4] self-assembly of a pyrene-functionalized Pt^II₈ tetragonal prism (<b>2</b>) is achieved using a newly designed star-shaped organometallic acceptor (<b>1</b>) in combination with an amide-based “clip” donor (<b>L</b>). The propensity of this prism (<b>2</b>) as a selective sensor for nitroaromatics (2,4-dinitrotoluene, 1,3,5-trinitrotoluene, and picric acid), which are the chemical constituents of many commercial explosives, has been examined

Coordination-Driven Self-Assembly of 2D-Metallamacrocycles Using a New Carbazole-Based Dipyridyl Donor: Synthesis, Characterization, and C₆₀ Binding Study

A new carbazole-based 90° dipyridyl donor 3,6-di­(4-pyridylethynyl)­carbazole (<b>L</b>) containing carbazole-ethynyl functionality is synthesized in reasonable yield using the Sonagashira coupling reaction. Multinuclear NMR, electrospray ionization-mass spectrometry (ESI-MS), including single crystal X-ray diffraction analysis characterized this 90° building unit. The stoichiometry combination of <b>L</b> with several Pd­(II)/Pt­(II)-based 90° acceptors (<b>1a</b>–<b>1d</b>) yielded [2 + 2] self-assembled metallacycles (<b>2a</b>–<b>2d</b>) under mild conditions in quantitative yields [<b>1a</b> = <i>cis</i>-(dppf)­Pd­(OTf)₂; <b>1b</b> = <i>cis</i>-(dppf)­Pt­(OTf)₂; <b>1c</b> = <i>cis</i>-(tmen)­Pd­(NO₃)₂; <b>1d</b> = 3,6-bis­{<i>trans</i>-Pt­(CC)­(PEt₃)₂(NO₃)}­carbazole]. All these macrocycles were characterized by various spectroscopic techniques, and the molecular structure of <b>2a</b> was unambiguously determined by single crystal X-ray diffraction analysis. Incorporation of ethynyl functionality to the carbazole backbone causes the resulted macrocycles (<b>2a</b>–<b>2d</b>) to be π-electron rich and thereby exhibit strong emission characteristics. The macrocycle <b>2a</b> has a large internal concave aromatic surface. The fluorescence quenching study suggests that <b>2a</b> forms a ∼1:1 complex with C₆₀ with a high association constant of <i>K</i>_sv = 1.0 × 10⁵ M^–1

Coordination-Driven Self-Assembly of 2D-Metallamacrocycles Using a New Carbazole-Based Dipyridyl Donor: Synthesis, Characterization, and C₆₀ Binding Study

A new carbazole-based 90° dipyridyl donor 3,6-di­(4-pyridylethynyl)­carbazole (<b>L</b>) containing carbazole-ethynyl functionality is synthesized in reasonable yield using the Sonagashira coupling reaction. Multinuclear NMR, electrospray ionization-mass spectrometry (ESI-MS), including single crystal X-ray diffraction analysis characterized this 90° building unit. The stoichiometry combination of <b>L</b> with several Pd­(II)/Pt­(II)-based 90° acceptors (<b>1a</b>–<b>1d</b>) yielded [2 + 2] self-assembled metallacycles (<b>2a</b>–<b>2d</b>) under mild conditions in quantitative yields [<b>1a</b> = <i>cis</i>-(dppf)­Pd­(OTf)₂; <b>1b</b> = <i>cis</i>-(dppf)­Pt­(OTf)₂; <b>1c</b> = <i>cis</i>-(tmen)­Pd­(NO₃)₂; <b>1d</b> = 3,6-bis­{<i>trans</i>-Pt­(CC)­(PEt₃)₂(NO₃)}­carbazole]. All these macrocycles were characterized by various spectroscopic techniques, and the molecular structure of <b>2a</b> was unambiguously determined by single crystal X-ray diffraction analysis. Incorporation of ethynyl functionality to the carbazole backbone causes the resulted macrocycles (<b>2a</b>–<b>2d</b>) to be π-electron rich and thereby exhibit strong emission characteristics. The macrocycle <b>2a</b> has a large internal concave aromatic surface. The fluorescence quenching study suggests that <b>2a</b> forms a ∼1:1 complex with C₆₀ with a high association constant of <i>K</i>_sv = 1.0 × 10⁵ M^–1