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Cover Illustration
2015, Vol.1  No.1
The cover picture shows a spirofluorenexan-thene-based host material synthesized by a new method with higher yield for phosphorescent organic light-emitting diodes (OLED). Due to low-cost, spiro-fluorenexanthene-based derivatives will be likely to replace spirobifluorene-based derivatives and become the next generation of spiro photoelectronic materials. The device performances of the blue phosphorescent OLED based on the biphenyl (Spiro[fluorene-9,9'- xan-then]-2-yl)phosphine oxide (SFX2PO) are equivalent to that of the device based on phosphine oxide spirobifluo-rene (SPPO1). Moreover, the efficiency of the device using co-host structure with the blend of SFX2PO and 4,4',4"-tris(carbazol-9-yl)triphenylamine (TCTA) is nearly doubled compared with that of the device based on the single host of SFX2PO or SPPO1. More details are discus [Detail] ...
Online ISSN: 2414-3421
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  • Table of Content
      01 December 2015, Volume 1 Issue 1    Next Issue
    For Selected: View Abstracts Toggle Thumbnails
    Contents: Gen. Chem. 1/2015
    General Chemistry. 2015, 1 (1): 1-2.   DOI: 10.21127/yaoyigc20159001
    Abstract   PDF (868KB) ( )
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    Spirofluorene-Based Blue Phosphorescent Organic Light-Emitting Diode with Improved Efficiency Using Co-Host Structure
    Mingli Sun, Yuqiao Guan, Bin Liu, Shufen Chen, Yang Zhang, Hongtao Cao, Linghai Xie, Yan Qian, Wei Huang
    General Chemistry. 2015, 1 (1): 3-7.   DOI: 10.21127/yaoyigc20150003
    Abstract   HTML   PDF (498KB) ( )

    Highly efficient blue phosphorescent organic light-emitting diode (OLED) is achieved by using a blend of biphenyl (spiro[fluorene-9,9'-xanthen]-2-yl) phosphine oxide (SFX2PO) and various of hole- or electron-transporting materials such as di-[4-(N,N-di-p-tolyl-amino)-phenyl]cyclohexane (TAPC), 2,2',2"-(1,3,5-benzinetriyl)-tris(1- phenyl-1-H-benzimidazole) (TPBi) and 4,4',4"-tris(carbazol-9-yl)triphenylamine (TCTA). The results show that TCTA and SFX2PO can partially form exciplex and have better charge carrier balance performance. The driving voltage and efficiency are improved in a multi-player device with TCTA and SFX2PO as the co-host. The device shows a maximum current efficiency of 22.75 cd•A–1, which is nearly two folds over the device using SFX2PO or phosphine oxide spirobifluorene derivative (SPPO1) as a single host.

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    Theoretical Study of σ-π Conjugated Semiconductors Based on cis- and trans-Cyclopropane Derivatives
    Yuyu Liu, Lei Yang, Xiaofei Zhang, Jiewei Li, Linghai Xie, Mingdong Yi, Wei Huang
    General Chemistry. 2015, 1 (1): 8-14.   DOI: 10.21127/yaoyigc20150001
    Abstract   HTML   PDF (2702KB) ( )

    The high strain cyclopropane as σ block model inserted in organic semiconductors to tune the structures and optical properties was investigated by the density functional theory method. The band gaps and absorption peaks of 1,2-disubstituted cyclopropanes were between the corresponding alkanes and olefins. The cis-isomers had higher steric strain between two substituents and lower symmetry than the trans-isomers in ground-state structures. The electronic transitions (S0→S1) were mainly on the aryl parts, which were stronger coherence with surrounding atoms in cis-isomers, while the trans-isomers were on the cyclopropyl. Furthermore, 1,2-disubstituted cyclopropanes (1A, 1B, 2A, 4B) could respond to the charge stimulation, which are potential materials for organic electronics and mechatronics.

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    Full Papers
    A Hyaluronic Acid-Chitosan-Gadolinium Nanosphere for Specific Tumor-Targeted MRI Contrast Agent
    Yu Qiao, Jiejun Cheng, Guangyu Wu, Qing Lu, Fan Yi, Jianrong Xu, Jun Zhu, Dannong He
    General Chemistry. 2015, 1 (1): 15-21.   DOI: 10.21127/yaoyigc20150004
    Abstract   HTML   PDF (291KB) ( )
    A hyaluronic acid-chitosan-gadolinium (HA-CTS-Gd) nanosphere is prepared by HA modified CTS nanosphere and the complexation between Gd ions and functional groups in CTS and HA molecule. The nanosphere is used as a novel magnetic resonance imaging (MRI) contrast agent for targeting specific tumor. The results show that the HA-CTS-Gd nanosphere is stable in physiological environment due to the strong Gd chelating interaction between the abundant functional groups in HA and chitosan molecules, which leads to low toxicity. Moreover, the obtained nanosphere reveals a high CD44 targeting efficiency and relaxation efficiency in vitro, and it has a great agency for human colonic and mouse lymphatic tumor MRI in vivo. Thus, the novel MRI contrast agent can be taken up selectively by CD44 antigen and used as a potential MRI contrast agents in specific tumor.
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    Chemical Constituents from the Barks of Swietenia macrophylla
    Liwen Tian, Xifeng Teng, Cheng Zhong, Yang Xie
    General Chemistry. 2015, 1 (1): 22-25.   DOI: 10.21127/yaoyigc20150002
    Abstract   HTML   PDF (170KB) ( )

    A new tirucallane-type triterpenoid, swietentol (1), was isolated from the barks of Swietenia macrophylla, toether with four known triterpenoids (25), five known limonoids (610), and other six compounds (1116). The structure of swietentol (1) was elucidated by extenstive 2D NMR and MS analysis.

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    Characteristics and a Convenient Measuring Method of 1H-15N Heteronuclear Multiple Bond Correlation Spectroscopy
    Qing Liu, Xuerong Zhu
    General Chemistry. 2015, 1 (1): 26-28.   DOI: 10.21127/yaoyigc20150005
    Abstract   HTML   PDF (118KB) ( )

    Some characteristics of 1H-15N heteronuclear multiple bond correlation (HMBC) spectroscopy of an aliphatic amine was described. A measuring method of 1H-15N HMBC spectroscopy at natural abundance was also introduced. 1H-15N HMBC spectra can be recorded using the Bruker standard experiment HMBCGP_15N. The optimal value of the acquisition parameter CNST13 for this experiment ranges from 3 to 5. The measuring time is about 4 times longer than the 1H-13C HMBC one.

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