Phenanthroline Derivatives as Efficient Organic Photocatalysts for Visible-Light-Mediated PET-RAFT Polymerization

Phenanthroline is an excellent and stableπ-electron acceptor with a large conjugated chromophore.Phenanthroline derivatives are widely used in adsorption,photodegradation,solar cells,biology,and so on.At present,there are still limited organic molecules utilized to efficiently photocatalyze reversible-deactivation radical polymerization(RDRP).Therefore,the design of organic photocatalysts(OPCs)for RDRP remains a challenge.Herein,according to the strategy of combining the donor groups and weak acceptor groups,donor-acceptor(D-A)type OPCs based on phenanthroline were utilized for the first time in photoinduced electron transfer-reversible addition-fragmentation chain transfer(PET-RAFT)polymerization.1,10-Phenanthroline-5-amine(Aphen)with a donor group-amino was screened out for efficacious photo-controlled radical polymerization under blue light for various monomers with conjugated and unconjugated structures with high monomer conversion and well-defined narrow dispersity polymers(Đ<1.20).Controllable homo-polymers and block copolymers were successfully realized by chain extension reaction and block copolymerization of structurally diverse monomers.

STUDIES ON FLUORESCENCE SPECTRA OF SAMARIUM EUROPIUM TERBIUM AND DYSPROSIUM WITH BENZOYL UREA DERIVATIVES AND PHENANTHROLINE

Rare earth chelates of benzoyl urea derivatives were prepared in ethanol and fluorescence spectra of these chelates were studied in detail. A composition of [RE(BU)_3Phen] (NO_3)_3 was obtained. Correlation between chemical properties of ligands, chelates and spectroscopy was discussed. Intramolecular energy transfer in rare earth chelates was explained.

Syntheses of Novel 5-Alkylamido-1,10-phenanthrolines

Amino-1,10-phenanthroline and three types of new 5-substituted 1,10-phenanthroline derivatives by different alkyl amides, phen-NHCOR[phen=1,10-phenanthroline; R=CHCH 2; (CH 2) nBr, n=1,3—5; (CH 2) nCH 3, n=9—14], were synthesized. They were characterized by means of elemental analyses, infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and mass spectroscopy. These new compounds are important ligands or the active materials of ruthenium(Ⅱ) electrochemiluminescent(ECL) sensors.

Two New Low Dimensional Lead(Ⅱ) Diiodide Complexes by Introducing Carbonyls on 1,10-Phenanthroline: a Combined Experimental and Theoretical Study

Two new low dimensional lead（Ⅱ） diiodide complexes with 1,10-phenanthroline- 5,6-dione （Phendione）, PbI2（Phendione）2 （1） and PbI2（Phendione）（DMSO）2 （2）, have been synthesized by solution processes and structurally determined by X-ray diffraction method. Both compounds are mononuclear with the lead centers being in highly distorted octahedral environments. Hydrogen bonds and π-π stacking interactions contribute to the structural extension and stabilization. Theoretical calculations based on the DFT/B3LYP level indicate that the introduction of electronic donating groups on the phenanthroline ring can improve the electron density of nitrogen atoms, and they can replace part of the bridged iodine atoms to lower the structural dimensions. Experimental band gaps of about 2.07 and 1.97 eV indicate their semiconductor nature.

A New Bismuth(Ⅲ) Iodide Inorganic/organic Hybrid Solid Containing Large Heterocyclic Conjugated Organic Ligand: Synthesis, Properties and Calculations

A new bismuth（III） iodide inorganic/organic hybrid containing larger heterocyclic conjugated organic ligand, [（dppz）2Bi2I6]·2DMF （1） （dppz = dipyrido[3,2-a：2＇,3＇-c]phenazine）, has been synthesized by solution process and structurally determined by X-ray diffraction method. 1 crystallizes in triclinic, space group Pī with Mr= 1844.08, α = 9.215（5）, b = 11.488（6）, c = 12.424（9） ？, α = 106.66（2）, β = 90.84（2）, γ = 92.34（2）°, V = 1258.5（13） ？3, Z = 1, Dc = 2.433 g/cm3, F（000） = 830, μ（MoKα） = 10.702 mm–1, the final R = 0.0834 and wR = 0.1947 for 2749 observed reflections with I 〉 2σ（I）. 1 consists of a dimeric structure [（dppz）2Bi2I6], in which two [（dppz）BiI3] fragments are bridged by a pair of iodine atoms. Hydrogen bonds and π···π stacking interactions contribute to the structural extension and stabilization. Experimental band gap of about 2.13 eV indicates its semiconductor nature. The optical absorption spectrum and electronic structure were also discussed.

Crystal Structure of Adduct 2-Phenyl-imidazo[4,5-f] 1,10-phenanthroline Methanol

absractThe structure of the title adduct comprises a phenanthroline derivative 2 phenyl imidazo[4,5 f ] 1,10 phenanthroline and a methanol. The composition of the crystalline adduct was cha^racterized as C 19 H 12 N 4·CH 3OH. It belongs to orthorhombic system, space group Pna 2 1 with a =1 3693(4) nm, b = 2 2988(7) nm, c =0 51338(15) nm, V =1 6160(8) nm 3, Z =4, and final R 1=0 0423, wR 2=0 1012. Crystal structure shows that all the 19 carbon atoms and 4 nitrogen atoms are coplanar. The bond length data indicated that a very extensive conjugation system was formed. This conjugation makes the compound being a potentially excellent energy transformer used for luminescent materials.

Interactions of Phenanthroline Compounds with i-Motif DNA

The interactions of each of three phenanthroline derivatives 1, 2 and 3 with the human telomeric/-motif DNA were investigated. The results suggest these compounds are potent binders. The compounds could stabilize the structure of i-motif DNA by π-π stacking. Moreover, the binding constants of the compounds with/-motif DNA were （2.71-8.12）×10^4 L·mol^-1, and the binding stoichiometry ratio was 1：1. CD studies reveal that the binding by phenanthroline comoounds perturbs the conformation of i-motif DNA.