Reaction of (CH)SiC≡Cbpy (bpy = 2,2′-bipyridyl), (CH)SiC≡CC Htpy (tpy = 2,2′6′2″-terpyridyl), or (CH)SiC≡ CCHC≡Cbpy with Pt(Bu′bpy)Cl in the presence of KF and Cul gave Pt(Bu′bpy)(C=Cbpy) (1), Pt(Bu′ bpy)(C≡CCHtpy) (5), or Pt(Bu′bPy)(C≡CCHC≡CbPy) (9), respectively. Incorporating Ln(hfac) (Ln = Nd, Er, Yb; hfac = hexafluoroacetylacetonate) units with 1, 5, and 9 through 2,2′-bipyridyl/ 2,2′:6′2″-terpyridyl chelation induces isolation of a series of PtLn heterotrinuclear complexes. Upon excitation of the PtLn complexes at 350 nm ≤ λ ≤ 500 nm, near-infrared (NIR) luminescence from lanthanide ions is indeed "lighting up" through effective Pt → Ln energy transfer from [d(Pt) → π*(Bu′2bpy)] metal-to-ligand charge transfer transition excited-state of the Pt(Bu′bpy)bis(acetylide) antenna chromophore. By successive insertion of phenylene or ethynyl between acetylide and 2,2′-bipyridyl/2,2′:6′,2″-terpyridyl in the bridging ligands, the rate and efficiency of Pt - Ln energy transfer are tunable. In contrast with quite effective Pt → Ln energy transfer in Pt-C≡Cbpy-Ln (Pf⋯Ln = 8.6 Å) and Pt-C≡CCHtpy-Ln (Pt⋯Ln = 14.1 Å) arrays, the long-range energy transfer across Pt-C≡CCHC≡Cbpy-Ln (Pt⋯Ln = 14.9 Å) array becomes less efficient. © 2009 American Chemical Society.

Haibing Xu    Zhang Li-Yi    陈小明     Li Xiu-Ng    陈忠宁   

Crystal Growth and Design

2009

A three-dimensional mixed-valent iron(II, III) trans-1,4- cyclohexanedicarboxylate, 1,4-chdc, coordination polymer, [Fe Fe -(μ4-O)(1,4-chdc) ]∞, 1, has been synthesized hydrothermally by mixing iron powder and 1,4-chdcH and investigated by X-ray diffraction, dc and ac magnetic susceptibility, and iron-57 Mössbauer spectroscopy over a wide range of temperatures. Single-crystal X-ray diffraction studies of 1 at 90(2), 293(2), and 473(2) K reveal a tetrahedral [Fe (μ -O)Fe (μ -O)] mixed-spin-chain structure with no change in the P1̄ space group but with subtle changes in the Fe-0 and Fe Fe distances with increasing temperature. These changes are associated with the electron delocalization observed by Mossbauer spectroscopy above 225 K. Magnetic studies reveal three different magnetic regimes in 1 between 2 and 320 K. Above 36 K 1 is a one-dimensional ferrimagnetic-like complex with frustration arising from competing exchange interactions between the iron(ll) and iron(lll) ions in the chains. Between 36 and 25 K the interchain interactions are non-negligible and 1 undergoes three-dimensional ordering at 32.16 K but with some residual fluctuations. Below 25 K the residual fluctuations slow and eventually freeze below 15 K.; the small net moment of 0.22 μ per mole of 1 observed below 15 K may be attributed to a non-collinear or canted spin structure of the spins of the four iron ions in the [Fe (μ -O)Fe -(μ -O)] chains. Below 32 K the Mössbauer spectra of 1 exhibit sharp sextets for both the iron(lll) and iron(ll) ions and are consistent with either a static long-range or a short-range magnetic ground state or a slow relaxation between two canted magnetic states that are indistinguishable at the observed spectral resolution. The 85 and 155 K spectra reveal no electron delocalization and correspond solely to fixed valence iron(ll) and iron(lll). Between 225 and 310 K the spectra reveal the onset of electron delocalization such that, at 295 to 310 K, 25, 25, and 50% of the iron in 1 is present as iron(ll), iron(lll), and iron(ll/lll) ions, respectively. The absence of any spectral line broadening associated with this electron delocalization and the coexistence of four doublets between 225 and 310 K indicate that the delocalization occurs through electron tunneling via vibronic coupling. The sudden increase in the tunneling rate beginning above about 260 K and the presence of a cusp in the magnetic susceptibility centered at about 275 K strongly suggest the existence of a charge order/disorder transition whose nature and order are discussed. © 2009 American Chemical Society.

Yanzhen Zheng    Xue Wei    Weixiong Zhang    童明良    陈小明     Grandjean Fernande    Long Gary J.    Ng Seik Weng    Panissod Pierre    Drillon Marc   

Inorganic Chemistry

2009

Two pairs of supramolecular ¡somers based on ternary zinc(ll)/triazolate/X (triazolate = 3,5-dimethyl-1,2,4-triazolate (Hdmtz), X = HCOOΓ, F-) metal azolate frameworks, namely, [Zn(dmtz)(HCOO)] · H0 (MAF-X3, 1a), [Zn(d- mtz)(HCOO)]·(1/6Me NH)(1/4H0) (MAF-X4,1b), [Zn(dmtz)F] (MAF-X5, 2a), and [Zn(dmtz)F] (MAF-X6, 2b), have been synthesized via variations of the reaction conditions. The 3-connected Zn(dmtz) networks in 1a, 1b, 2a, and 2b can be described as rarely observed 4.8, 4.12, (8,3)-b, and 8.10-a, respectively. Besides the μ-dmtz, tetrahedral and trigonal-bipyramidal/square-pyramidal coordination of the Zn ions are accomplished by monodentate formate and μ-F, respectively. While 1a and 2b are nonporous structures, 1b and 2a exhibits 1D nanotubular hydrophilic (d 3.2 Å) and hydrophobic (of 3.6 Å) channels, respectively. Thermogravimetric analysis shows that the stabilities of 2a and 2b are much better than those of 1a and 1b, which may be ascribed to different coordination numbers of zinc atoms. Moreover, 1b and 2a with different pore properties show selective sorption behavior. © 2009 American Chemical Society.

Zhu Ai-Xin    Jianbin Lin    Jiepeng Zhang    陈小明    

Inorganic Chemistry

2009

Two new interpenetrated metal-carboxylate frameworks (MCFs) [(CH )NH][Zn(BDC)(BTB)][Zn (BTB)(HO)].4DMA.2C HOH.7HO (MCF-25, 1, HBDC = 1,4-benzenedicarboxylic acid, HBTB = benzene-1,3,5-tribenzoic acid), and [(CH)2NH][Zn(BDC)(BTB)].3DMF.2H O (MCF-26, 2), synthesized by solvothermal reaction and room-temperature evaporation, respectively, are constructed by Zn (OCR) (in 1 and 2) and Zn(O CR) (in 1) units incorporating mixed BDC and BTB ligands. 1 is composed of two different frameworks with 2D 6 bilayers and a rare (3,5)-connected 3D hms net giving an interesting 2D + 3D framework, whereas 2 features a novel 3-fold interpenetrated (3,5)-connected gra net with chiral, hexagonal helical channels. Structural analysis shows that the two 3D nets of hms in 1 and gra in 2 are strict isomers with the same components but different steric arrangements, which are derived from different orientations of the two axial carboxylate bridges in two isomeric Zn(OCR) SBUs. © 2009 American Chemical Societ.

Lei Hou    Jiepeng Zhang    陈小明    

Crystal Growth and Design

2009

A 1-D chain-like hybrid coordination polymer [(CuBr) (bpy)] (bpy = 2,2′-bipyridine) was first synthesized via a hydrothermal reaction of copper(I) bromide with 2,2′-bipyridine (bpy). The most fascinating feature of [(CuBr) (bpy)] is the unusual six-member-(Cu Br )-ring motif. The skeleton of copper bromide combined with bpy in [(CuBr) (bpy)] has not been reported. In addition, research on pyrolysis of [(CuBr) (bpy)] was reported in this paper. Oriented growth of single crystalline Cu(111) flake, which is usually prepared through depositing onto the surface of high-quality metal films (substrates), was synthesized by simply pyrolyzing [(CuBr) (bpy)] by adjusting the heating procedures. No capping reagent was induced to simplify the system. Since most of the research of pyrolysis of coordination polymers focuses on the relationship between the structure of precursor and sinter, the results of this paper show how the reaction conditions affect the morphology of the product and give a simple method for the synthesis of a Cu(111) flake, which has wide application in industry. © 2009 The Royal Society of Chemistry.

Liu Zhi-Fang    Zhu Ai-Xin    Lam Chi-Keung    Xie Guang-Wei    梁超伦    陈小明     Qiao Zheng-Ping   

CrystEngComm

2009

In order to reduce the vehicle rear collisions and the damage degrees on passengers, we adopt the dot matrix display technology and the vehicle high positioned brake reminder technology based on CAN bus. The designed high positioned brake reminder system is composed by the nodes based on CAN bus. The first node is the sensor data acquisition node based on SCM. The brake position sensor in the node converts the acquired position signals into electric signals, and transmits them to the SCM for data processing through AD conversion. The display unit is the second node of the system. The CAN bus control part is mainly composed by two core chips, SJA1000 and PCA82C250. It can not only display the reminder information when braking, but remind rear driver aiming at different situations such as displaying brake abruptness, avoiding or reduce the vehicle rear collisions. The manufacturing cost of the system is cheap.

陈小明    

Proceedings of the 2009 Pacific-Asia Conference on Circuits, Communications and System, PACCS 2009

2009

Multifunctional heteropentanuclear AlLn (Ln = Nd, Eu, Yb) clusters with a novel structure exhibit significantly fluoride-enhanced lanthanide emission intensity and lifetime in both solid state and solution as well as unusual white-light emitting for an AlEu complex. © 2009 The Royal Society of Chemistry.

Haibing Xu    陈小明     Qisheng Zhang    Zhang Li-Yi    陈忠宁   

Chemical Communications

2009

A new neutral [Ag(Hida)(NH)] molecule (1, Hida = l/7-imidazole-4, 5-dicarboxy- lic acid) has been synthesized and structurally characterized by single-crystal diffraction. Compound 1 crystallizes in monoclinic, space group Cllc with a = 18.3928(8), b = 8.3299(5), c = 13.682(7) Å, β = 113.179(2)°, V= 1926.9(10) A7ring;, Z = 8 and D = 2.784 gem. In the solid state, this disilver(I) compound can aggregate to furnish the energetically stable ligand-unsupported Ag-Ag interaction concomitant with significant photoluminescence changes in different aggregate states, and such argentophilicity interaction is also supported by molecular orbital calculations.

Zheng Shao-Liang    Yang Jin-Hua    陈小明    

Jiegou Huaxue

2009

Low-power wireless data acquisition is an important technical means to achieve automation and unmanned surveillanc of ultrasonic measurement systeme. Using wireless communication technology for ultrasonic data transfer, an ultrasonic data transfer method based on Zigbee technology is presented. The entire system hardware circuits and principle are discussed. The system consists of ultrasonic sensor nodes, wireless coordinator node and the terminal nodes. Zigbee protocol is used for the wireless transmission of data between nodes. Ultrasonic sensor nodes distributed in the measurement site and is responsible for collecting ultrasound information. Sensor nodes form self-organized the wireless data transmission network with the centre of coordinator nodes. Terminal nodes obtained the data from ultrasound treatment and transferred to the computer through the serial port and display records. Using Tl's CC2430 chip design, nodes make full use of the performance characteristics of the chip SoC with very few external components. The transmission system has good stability, low power consumption and small size. It can be easily laid to completed or under construction building of the application sites, easy to use and maintain. © 2009 IEEE.

陈小明     Yan Fulin   

Proceedings of the International Symposium on Test and Measurement

2009

To achieve the remote control and automation of ultrasonic testing equipment, a Bluetooth-based ultrasonic testing system was developed with single-chip microcomputer as the core and wireless communication technology for data transmission. The system is composed of master and slave units. The slave unit includes the ultrasonic transmitter and receiver circuits, Bluetooth communication module and the microcontroller. It is responsible for transmitting and receiving ultrasonic signal and sending the signal to the host. The master unit includes the MCV, LCD display circuit, Bluetooth communication module. It is responsible for data processing and display the results and controlling. The master and slave units transmit data via Bluetooth communication module. MSP430F microcontroller is used as systems main control unit and ROKIOI007 Bluetooth communication chip for wireless data transmission. The system can be used in dangerous environment such as high pressure or high temperature with a decrease of human security and other considerations. It has great application prospect. © 2009 IEEE.

陈小明     Xiao Shandong   

Proceedings of the International Symposium on Test and Measurement

2009