Subtle structure and fluorescence signal changes of four Hg-containing complexes: Influence of the solvents and the halide ions

Crystal Growth & Design

et al. 2019

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Based on an asymmetric pyridinyl triazole carboxylate ligand 1-(4pyridinylmethyl)-1H-1,2,4-triazole-3-carboxylic acid (Hpmtc), 12 cadmium(II) polymers {Cd 1.5 (pmtc) 11), and [Cd(pmtc)-(I)] n (12) have been synthesized and structurally characterized. Employment of different anions has resulted in different architectures and topological structures, ranging from twodimensional (2D) to three-dimensional (3D) frameworks, in which 2 and 4 present a new (4 2 • 6•10 3 )(4 2 •6 3 •8) 2 (4 2 •6) topology. Through calculations to the frontier molecular orbital (FMOs) of 9−11, their photoluminescence should be assigned as the n → π* transition. Moreover, the photoluminescent properties of 1−12 indicate that the coordination anions make great contribution to fluorescent emission of Cd(II) polymers.

Section: Resultsmentioning

confidence: 99%

Twelve Cadmium(II) Coordination Frameworks with Asymmetric Pyridinyl Triazole Carboxylate: Syntheses, Structures, and Fluorescence Properties

Crystal Growth & Design

et al. 2019

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“…3c). 41,42 The foregoing facts specify that these weak interactions are very important in 4b, where they contribute significantly to molecular self-assembly processes.…”

Section: Crystal Structure Of 4bmentioning

confidence: 99%

Topochemical polymerization of unsymmetrical aryldiacetylene supramolecules with nitrophenyl substituents utilizing C–H⋯π interactions

Liu

et al. 2015

Org. Biomol. Chem.

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Diacetylenes are versatile building blocks, in which many functional groups can be incorporated for the construction of new materials with desirable properties. In this study, 6-(p or m-nitrophenyl)-3,5-hexadiyne-1-ol (4a or 4b) containing nitrophenyl groups (host) and 2-hydroxyethyl groups (guest) in different diacetylene terminals were designed to establish an ordered supramolecular assembly that is complied with the strict requirements for the topochemical polymerization of diacetylenes. Crystal film and bulk crystals of compound 4b were obtained successfully by cast film and re-precipitation methods. Both of these could photopolymerize to the corresponding regular poly(diacetylene) polymer, as evidenced by UV-vis, IR, FL and Raman spectroscopy. The electrochemical properties and behaviors of 4a and 4b were also investigated, and the results show that the differences between the para and meta positions of the mono-phenylacetylene substituents probably result from the topochemical polymerization. Thus, m-nitrophenylbutadiyne derivatives with sizeable C-H∙∙∙π interactions seemed to be effective for the formation of a polymerizable packing, which is appropriate for topochemical polymerization.

Synthesis, Structures, and Antibacterial Activities of Four Similar 1D Metal‐organic Polymers with Different Metal Ions

Zeitschrift anorg allge chemie

Khan

Niu

et al. 2020

Four similar 1D metal‐organic polymers [Cd(impc)2(H2O)2]n (1), [Co(impc)2(H2O)2]n (2), [Mn(impc)2(H2O)2]n (3), and {[Cu(impc)2]·[jy2H2O}n (4) based on an asymmetric 5‐(1H‐imidazole‐l‐yl)‐3‐pyridinecarboxylic acid (Himpc) were prepared hydrothermally and structurally characterized. According to the frontier molecular orbital (FMOs) calculations, the photoluminescence of 1 should be assigned as the n→π* transition. The antibacterial properties of 1–4 were studied. 1 exhibited good antibacterial activities towards B. subtilis and S. aureus with the smallest MIC value of 2 μg·mL–1. Compared with CoII, MnII and CuII ions, the polymer with CdII ion has the better antibacterial activity. Our work preliminarily reveals that the metal ions also have different influences on antibacterial activities of complexes.