α-亚胺基磷杂二茂铁的合成、结构及配位化学研究（英文）

3,4-二甲基-1-苯基磷杂环戊二烯通过两次[1,5]σ-迁移在α-位分别引入苯基和亚胺基得到α-亚胺基磷杂环戊二烯负离子1,1和[Cp~*FeCl]_n反应得到新的P,N双齿配体α-亚胺基磷杂二茂铁2.2可以和Mo和Rh等形成配合物,其中2及其Mo配合物的结构由X射线单晶衍射确定.     

Two-Component Model for the Interstellar Scattering along the Line of Sight to the Pulsar PSR B0136＋57

A rigorous treatment of the refractive scintillation caused by a two-component interstellar scattering medium and a Kolmogorov form of density spectrum is discussed. It is assumed that the interstellar scattering medium is composed of a thin screen ISM and an extended interstellar medium. We conclude that the refractive scintillation caused by this two-component ISM scattering gives a more satisfactory explanation for the observed flux density variation than the single extended medium model along the line of sight to the pulsar PSR B0136＋57.     

7-[3-氨基-3-(4-甲氧苯基)丙酰基]-3-三氟甲基-5,6,7,8-四氢[1,2,4]三唑并[4,3-α]哌嗪的合成与表征

以2-氯吡嗪和对甲氧基苯甲醛为原料,经肼解、三氟乙酰化、闭环、氢化、缩合、脱保护基等一系列反应合成了新的稠合三唑衍生物:7-[3-氨基-3-(4-甲氧苯基)丙酰基]-3-三氟甲基-5,6,7,8-四氢[1,2,4]三唑并[4,3-α]哌嗪,目标化合物及中间体经IR、NMR、MS予以确证.     

OBSERVATION OF ACTIN POLYMERISATION WITH ATOMIC FORCE MICROSCOPY

We used atomic force microscopy (AFM) to image biological filaments deposited on mica substrates. After cutting of an actin fibre with the tip of the AFM, the filament started to grow in length. The growth occured in air under ambient conditions and proceeded over several days with a constant rate.     

MANIPULATION OF ATOMS, MOLECULES AND CLUSTERS FOR CONSTRUCTION OF NANOSYSTEMS

Controlled manipulations with the scanning tunneling microscope (STM) down to the scale of small molecules and single atoms allow to built molecular and atomic nanosystems, leading to the fascinating possibility of creating manmade structures on atomic scale. Here we present a short review on atomic scale manipulation investigations. Upon soft lateral manipulation of adsorbed species, in which only tip/particle forces are used, three different manipulation modes (pushing, pulling, sliding) can be discerned. We show that even the manipulation of highly coordinated native substrate atoms is possible and we demonstrate how this can be applied as local analytic and synthetic chemistry tools, with important consequences on surface structure research. Vertical manipulation of Xe and CO is demonstrated, leading to improved imaging with functionalized tips. With CO deliberately transferred to the tip, we have also succeeded to perform vibrational spectroscopy on single molecules. Furthermore, we describe how we have reproduced a full chemical reaction with single molecules, whereby all basic steps, namely preparation of the reactants, diffusion and association, are induced with the STM tip. Finally, we have extended the manipulation techniques to large specially designed molecules by performing lateral manipulation in constant height and realizing the principle of a conformational molecular switch.     

DIAMOND MICRO- AND NANOSTRUCTURING BY ACCELERATED CLUSTER EROSION

Reactive accelerated cluster erosion (RACE) has been used for direct micro- and nanostructuring of bulk diamond. Carbondioxide nanoparticles of about 1000 molecules are accelerated to 100keV energy in order to erode a staircase structure or a toothed wheel into diamond by using appropriate movable or fixed masks. Non-reactive erosion by argon clusters is slower but more effectively polishing. Large-scale molecular dynamics simulations show the nanoparticle impacts to lead to transient craters which relax to a very smooth surface via collective elastic recovery. The enhanced or reduced erosion of the respective cluster material is illuminated.     

A Modified Gravity Theory: Null Aether

General quantum gravity arguments predict that Lorentz symmetry might not hold exactly in nature. This has motivated much interest in Lorentz breaking gravity theories recently. Among such models are vector-tensor theories with preferred direction established at every point of spacetime by a fixed-norm vector field. The dynamical vector field defined in this way is referred to as the "aether". In this paper, we put forward the idea of a null aether field and introduce, for the first time, the Null Aether Theory(NAT) — a vector-tensor theory. We first study the Newtonian limit of this theory and then construct exact spherically symmetric black hole solutions in the theory in four dimensions, which contain Vaidya-type non-static solutions and static Schwarzschild-(A)dS type solutions, Reissner-Nordstr?m-(A)dS type solutions and solutions of conformal gravity as special cases. Afterwards, we study the cosmological solutions in NAT:We find some exact solutions with perfect fluid distribution for spatially flat FLRW metric and null aether propagating along the x direction. We observe that there are solutions in which the universe has big-bang singularity and null field diminishes asymptotically. We also study exact gravitational wave solutions — AdS-plane waves and pp-waves — in this theory in any dimension D ≥ 3. Assuming the Kerr-Schild-Kundt class of metrics for such solutions, we show that the full field equations of the theory are reduced to two, in general coupled, differential equations when the background metric assumes the maximally symmetric form. The main conclusion of these computations is that the spin-0 aether field acquires a "mass" determined by the cosmological constant of the background spacetime and the Lagrange multiplier given in the theory.     

Regularity Properties of the Degenerate Monge-Amp`ere Equations on Compact K¨ahler Manifolds

The author establishes a result concerning the regularity properties of the degenerate complex Monge-Amp`ere equations on compact K¨ahler manifolds.     

Poles of L-Functions on Quaternion Groups

The author shows that the (partial) standard Langlands L-functions on quarternion groups have at most simple poles at certain positive integers.     

5,8-二(3,4-乙撑二氧噻基)-萘基喹喔啉与对苯乙炔交替共轭聚合物的合成及其性能

合成了一种新单体5,8-二(5′-溴-3,4-乙撑二氧噻基)-萘基喹喔啉,并通过Sonogashira偶合反应将此单体与带有不同长链烷氧基的对苯乙炔进行交替共聚,得到了聚[(2,5-二庚氧基-1,4-苯撑)乙炔撑-5,8-二(3,4-乙撑二氧噻基)-萘基喹喔啉](PI)和聚[(2,5-二十二烷氧基-1,4-苯撑)乙炔撑-5,8-二(3,4-乙撑二氧噻基)-萘基喹喔啉](PII)。采用核磁共振氢谱、傅里叶红外光谱、紫外-可见光谱、荧光光谱、循环伏安和热重分析对聚合物进行了表征。结果表明:共聚物PI和PII有相似的光学特性,均在490 nm处出现紫外-可见最大吸收峰,在613 nm处出现荧光最大发射峰;热稳定性和电化学活性较好;在-1.0~2.0 V出现电致变色现象,颜色由红色变为深蓝色。