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4’- molecular structures

High accuracy molecular dimensions for the planar parent heterocycles in the gas phase have been obtained by microwave spectroscopy and are recorded in Table 2. These values have been corroborated for furan by a low-temperature X-ray crystallographic study [Pg.3]

Structure of Five-membered Rings with One Heteroatom [Pg.4]

It is interesting to compare the dimensions of the monocyclic systems with those recorded for their dibenzo counterparts where the aromatic nature of the heterocyclic ring is expected to be much diminished. Comparison of the data in Table 4 with that in Table 2 shows that [Pg.5]

69BCJ2174 72AX(B)100r 70JCS(A)1561 70AX(B)628 75IC2639 [Pg.5]

Formation of ionic MgO as shown hy Lewis structures and symbols. In MgO, Mg has lost 2 electrons and is in the +2 oxidation state, Mg(ll), and O has gained 2 electrons and is in the -2 oxidation state. [Pg.548]

FIGURE 19.7 Ionic bonds are formed by the transfer of electrons and the mutual attraction of oppositely charged ions in a crystalline lattice. [Pg.548]

Rather than individual atoms that have lost or gained electrons, many ions are groups of atoms bonded together covalently and having a net charge. A connnon example of such an ion is the ammonium ion, NH,  [Pg.548]

OBJECTIVE To understand molecular structure and bond angles. [Pg.317]

So far in this chapter we have considered the Lewis structures of molecules. These structures represent the arrangement of the valence electrons in a molecule. We use the word structure in another way when we talk about the molecular structure or geometric structure of a molecule. These terms refer to the three-dimensional arrangement of the atoms in a molecule. For example, the water molecule is known to have the molecular strurture [Pg.317]

Computer graphic of a linear molecule containing three atoms [Pg.317]

The tetrahedral molecular structure of methane. This representation is called a ball-and-stick model the atoms are represented by balls and the bonds by sticks. The dashed lines show the outline of the tetrahedron. [Pg.317]

On the other hand, some molecules exhibit a linear structure (all atoms in a line). An example is the CO2 molecule. [Pg.317]

The distribution of electron density in space is a simple means of visualizing the structure of molecules. One needs to calculate the probability distribution, Pi(r), using the wavefunction Tj [Pg.264]

Wavelets are a set of basis functions that are alternatives to the complex exponential functions of Fourier transforms which appear naturally in the momentum-space representation of quantum mechanics. Pure Fourier transforms suffer from the infinite scale applicable to sine and cosine functions. A desirable transform would allow for localization (within the bounds of the Heisenberg Uncertainty Principle). A common way to localize is to left-multiply the complex exponential function with a translatable Gaussian window , in order to obtain a better transform. However, it is not suitable when 1) varies rapidly. Therefore, an even better way is to multiply with a normalized translatable and dilatable window, v /yj,(x) = a vl/([x - b]/a), called the analysing function, where b is related to position and 1/a is related to the complex momentum. vl/(x) is the continuous wavelet mother function. The transform itself is now [Pg.265]

An important feature of wavelet analysis is to find the most appropriate mother function. This is not always obvious. The ranges of a and b are flexible, giving rise to continuous wavelets if unlimited [6], or orthonormal discrete wavelets if limited [7]. For the atomic orbital example, above, the authors demonstrated the effect of choosing as a mother function [Pg.266]

In that case the continuous wavelet transform becomes [Pg.266]

Further developments [3] lead naturally to improved solutions of the Schrodinger equation, at least at the Hartree-Fock limit (which approximates the multi-electron problem as a one-electron problem where each electron experiences an average potential due to the presence of the other electrons.) The authors apply a continuous wavelet mother. v (x), to both sides of the Hartree-Fock equation, integrate and iteratively solve for the transform rather than for the wavefunction itself. In an application to the hydrogen atom, they demonstrate that this novel approach can lead to the correct solution within one iteration. For example, when one separates out the radial (one-dimensional) component of the wavefunction, the Hartree-Fock approximation as applied to the hydrogen atom s doubly occupied orbitals is, in spherical coordinates. [Pg.266]

The distinguishing feature of all conductive polymers is the unsaturated carbon-based alternating single and double bond structure of the polymer [Pg.4]

2 The other isomer is called cis-polyacetylene. This has a slightly different structure with non-degenerate ground state energy. [Pg.5]

Here we consider those aspects of characterisation which fall between measurement of molecular structure and the bulk properties described above. A typical example might include the overall degree of crystallinity in a partially crystalline polymer, which could be determined by thermal analysis, scattering techniques or microscopy. The most appropriate method will of course be determined by the particular system of interest. Another example is taken from the area of polymer blends. In many cases the component materials are immiscible at the molecular level, and a phase-separated structure is formed. The morphology of this structure largely determines the way in which the blend will perform. Again, any of the above techniques could be used. Microscopy, in conjunction with preferential staining of one component, has proved particularly powerful in this area. [Pg.4]

The average number of monomer units per chain, or degree of polymerisation, may also be included under this heading. This is usually converted to, and quoted as, the average molar mass or molecular weight. The importance of this parameter is reflected by the fact that a complete chapter is devoted to methods for its determination. [Pg.4]

In Table 6.3, measured and calculated carbon-pnictogen element (Pn) bond lengths and bond angles of acyclic trivalent and related compounds, are tabulated. In Tables 6.5 and 6.6, X-ray crystallographic structures of representative trivalent and pentavalent organic bismuth compounds, as well as some relevant inorganic bismuth compounds, are collected. [Pg.442]

An important difference between the first and subsequent rows of main-group elements is the ability of the latter to be involved in extended [Pg.442]

Measured and calculated carbon-pnictogen element (Pn) bond lengths and bond angles of acyclic trivalent and related compounds [Pg.444]

Compound Measured and calcd. mean bond length of C-Pn (A) Measured and calcd. Mean bond angle of C-Pn-C ( ) Calculated s-character of lone pair electron (%) Reference [Pg.444]

Calculated by Gaussian 92, RHF/LANL2DZ Gaussian 92, Revision E.3, M.J. Friseh et al Gaussian, Inc., Pittsburgh, PA, 1992. [Pg.444]

Computer graphics of (a) a linear molecule containing three atoms, (b) a trigonal planar molecule, and (c) a tetrahedral molecule. [Pg.338]

Theoretical chemistry has two problems that remain unsolved in terms of fundamental quantum theory the physics of chemical interaction and the theoretical basis of molecular structure. The two problems are related but commonly approached from different points of view. The molecular-structure problem has been analyzed particularly well and eloquent arguments have been advanced to show that the classical idea of molecular shape cannot be accommodated within the Hilbert-space formulation of quantum theory [161, 2, 162, 163]. As a corollary it follows that the idea of a chemical bond, with its intimate link to molecular structure, is likewise unidentified within the quantum context [164]. In essence, the problem concerns the classical features of a rigid three-dimensional arrangement of atomic nuclei in a molecule. There is no obvious way to reconcile such a classical shape with the probability densities expected to emerge from the solution of a molecular Hamiltonian problem. The complete molecular eigenstate is spherically symmetrical [165] and resists reduction to lower symmetry, even in the presence of a radiation field. [Pg.177]

According to various observations, the aggressive action of a substance depends not only on the presence of particular atoms or radicles in the molecule, but also on the molecular structure, and in particular on [Pg.22]

Influence of Unsaturated Bonds. The presence of unsaturated bonds in the molecule usually involves an increase in the physiopathological properties. This observation was made by Loew in 1893. [Pg.22]

Among the war gases various examples occur of the influence of the unsaturated bond. Thus, acrolein CH = CH—CHO, has strongly irritant properties, while the corresponding saturated aldehyde, propionaldehyde, CH3—CH —CHO is innocuous. Similarly, /3 chlorovinyl dichloroarsine. Cl—CH = CH—AsCl, is a powerful vesicant, while the corresponding saturated compound, jS chloroethyl dichloroarsine. Cl—CHj—CHg—AsCl, has only weak vesicatory properties.  [Pg.22]

Other examples may be found among the mono- and di-halogenated acetylenes, such as diiodo- and dibromo-acetylene, CI2 = C and CBrj = C, which have more interesting physiopathological properties than the halogenated paraffin hydrocarbons. [Pg.22]

Influence of Molecular Symmetry. The spatial arrangement of the functional groups in a molecule has a definite influence on the degree of its toxicity. It has been observed that substances with S5mimetrical molecules generally have a more powerful aggressive action than asymmetrical substances. Thus, symmetrical-dichloroacetone, [Pg.22]

The physical characteristics of a polymer depend not only on its molecular weight and shape, but also on differences in the structnre of the molecular chains. Modern polymer synthesis techniques permit considerable control over various structural possibilities. This section discusses several molecular structures including linear, branched, crosslinked, and network, in addition to varions isomeric configurations. [Pg.558]

Polymers may be synthesized in which side-branch chains are connected to the main ones, as indicated schematically in Fignre 14.7h these are fittingly called branched polymers. The branches, considered to be part of the main-chain molecule, may result from side reactions that occur during the synthesis of the polymer. The chain packing efficiency is reduced with the formation of side branches, which results in a lowering of the polymer density. Polymers that form linear structures may also be branched. For example, high-density polyethylene (HDPE) is primarily a linear polymer, whereas low-density polyethylene (LDPE) contains short-chain branches. [Pg.558]

FigMre 14.7 Schematic representations of (a) linear, (b) branched (c) crosslmke, (t ee-dimensional) molecular structures. Circles designate individual repeat units. [Pg.558]

In liquid crystals or LC-glasses one looks for orientational order and an absence of three-dimensional, long-range, positional order. In liquid crystals, large scale molecular motion is possible. In LC-glasses the molecules are fixed in position. The orientational order can be molecular or supermolecular. If the order rests with a supermolecular structure, as in soap micelles and certain microphase separated block copolymers, the molecular motion and geometry have only an indirect influence on the overall structure of the material. [Pg.16]

In this review we are mainly concerned with thermotropic materials, i.e. with liquid crystals and LC-glasses which do not contain a solvent. The transitions of the macro-molecular, thermotropic liquid crystals are governed then by temperature, pressure and deformation. In lyotropic liquid crystals and LC-glasses a solvent or dispersing agent is present in addition. The transitions then also become concentration dependent. [Pg.16]

Supermolecular level liquid crystals are not of major concern in this review. In fact, they form a class of materials which should best be separated from the normal liquid crystals . Although there are structural similarities to the molecular liquid crystals, molecular motion and transition behavior of these liquid crystals based on supermolecular structure is completely different. [Pg.16]

Mesophases of supermolecular structure do not need a rigid mesogen in the constituent molecules. For many of these materials the cause of the liquid crystalline structure is an amphiphilic structure of the molecules. Different parts of the molecules are incompatible relative to each other and are kept in proximity only because of being linked by covalent chemical bonds. Some typical examples are certain block copolymers50 , soap micelles 51 and lipids52. The overall morphology of these substances is distinctly that of a mesophase, the constituent molecules may have, however, only little or no orientational order. The mesophase order is that of a molecular superstructure. [Pg.18]

Block copolymers of sufficiently large and incompatible sequences of repeating units undergo microphase separation. Because of the geometric restriction caused by the needed alignment of the junctions between the different blocks, the phases [Pg.18]

The chromophores of optical brighteners are Jt electron systems in which Jt-Jt transitions occur. The chromophores must be rigid [5], and their conformations should differ only slightly in the electronic ground state and in the first excited state. [Pg.588]

Brightener chromophores can be regarded as combinations of building blocks with the following numbers of Jt electrons  [Pg.588]

4- phenylene, 2,5-furanediyl, 2,5-thiophenediyl, phenyl, fur-2-yl, pyrazol-4-yl, pyrazol-l-yl, 1,2,3-triazol-2-yl, 1,2,4-triazol-l-yl, [Pg.588]

The absorption and fluorescence of coumarin with an exocyclic n center, naphthalimide, and pyrene are close to the favorable region for brighteners, and so only slight lengthening of these chromophore systems is necessary (63) or possible (64-66, 67). [Pg.589]

The optical properties of chromophores can be varied by means of substituents. Electron donors (e g., alkyl, alkoxy, or substituted amino groups) and electron acceptors (e g., cyano, alkylsulfonyl, or carbalkoxy groups) can intensify fluorescence depending on their position on the chromophore. [Pg.589]

For example, fluorine has the Pauling electronegativity of 4.0 and a value of 3.91 on the Mulliken scale. A different approach was used by Allred and Rochow to establish an electronegativity scale. This scale is based on a consideration of the electrostatic force holding a valence shell electron in an atom of radius, r, by an effective nuclear charge, [Pg.31]

Many other electronegativity scales have been developed, but the three scales described are the ones most frequently used, and qualitative agreement between the scales is quite good. [Pg.31]

There are two principal approaches to describe bonding in molecules by quantum mechanical methods. These are known as the valence bond method and the molecular orbital method. Basically, the difference is in the way in which molecular wave functions [Pg.31]

Within the framework of conjugated materials, the studies on different polymeric systems led to the conclusion that a great step forward in the understanding [Pg.364]


This spectrum is called a Raman spectrum and corresponds to the vibrational or rotational changes in the molecule. The selection rules for Raman activity are different from those for i.r. activity and the two types of spectroscopy are complementary in the study of molecular structure. Modern Raman spectrometers use lasers for excitation. In the resonance Raman effect excitation at a frequency corresponding to electronic absorption causes great enhancement of the Raman spectrum. [Pg.340]

Because of the existence of numerous isomers, hydrocarbon mixtures having a large number of carbon atoms can not be easily analyzed in detail. It is common practice either to group the constituents around key components that have large concentrations and whose properties are representative, or to use the concept of petroleum fractions. It is obvious that the grouping around a component or in a fraction can only be done if their chemical natures are similar. It should be kept in mind that the accuracy will be diminished when estimating certain properties particularly sensitive to molecular structure such as octane number or crystallization point. [Pg.86]

The various arrangements of carbon atoms can be categorised into senes , which describe a common molecular structure. The series are based on four main categories which refer to... [Pg.90]

Before entering the detailed discussion of physical and chemical adsorption in the next two chapters, it is worthwhile to consider briefly and in relatively general terms what type of information can be obtained about the chemical and structural state of the solid-adsorbate complex. The term complex is used to avoid the common practice of discussing adsorption as though it occurred on an inert surface. Three types of effects are actually involved (1) the effect of the adsorbent on the molecular structure of the adsorbate, (2) the effect of the adsorbate on the structure of the adsorbent, and (3) the character of the direct bond or local interaction between an adsorption site and the adsorbate. [Pg.582]

Similar, very detailed studies were made by Ebert [112] on water adsorbed on alumina with similar conclusions. Water adsorbed on zeolites showed a dielectric constant of only 14-21, indicating greatly reduced mobility of the water dipoles [113]. Similar results were found for ammonia adsorbed in Vycor glass [114]. Klier and Zettlemoyer [114a] have reviewed a number of aspects of the molecular structure and dynamics of water at the surface of an inorganic material. [Pg.589]

A 1.2.2 QUANTUM THEORY OF ATOMIC AND MOLECULAR STRUCTURE AND MOTION... [Pg.54]

Herzberg G 1966 Molecular Spectra and Molecular Structure III Electronic Spectra and Electronic Structure of Polyatomic Molecules (New York Van Nostrand-Reinhold)... [Pg.82]

The above two references are comprehensive and individualistic surveys of symmetry, molecular structure and dynamics. [Pg.85]

Herzberg G 1939, 1945, 1966 Molecular Spectra and Molecular Structure (New York van Nostrand) 3 vols... [Pg.281]

Conservation laws at a microscopic level of molecular interactions play an important role. In particular, energy as a conserved variable plays a central role in statistical mechanics. Another important concept for equilibrium systems is the law of detailed balance. Molecular motion can be viewed as a sequence of collisions, each of which is akin to a reaction. Most often it is the momentum, energy and angrilar momentum of each of the constituents that is changed during a collision if the molecular structure is altered, one has a chemical reaction. The law of detailed balance implies that, in equilibrium, the number of each reaction in the forward direction is the same as that in the reverse direction i.e. each microscopic reaction is in equilibrium. This is a consequence of the time reversal syimnetry of mechanics. [Pg.378]

Herzberg G 1950 Molecular Spectra and Molecular Structure I. Spectra of Diatomic Mo/ecu/es 2nd edn (Princeton, NJ Van Nostrand)... [Pg.1149]

Shifts can also be predicted ftom basic theory, using higher levels of computation, if the molecular structure is precisely known [16], The best calculations, on relatively small molecules, vary from observation by little more than the variations in shift caused by changes in solvent. In all cases, it is harder to predict the shifts of less coimnon nuclei, because of the generally greater number of electrons in the atom, and also because fewer shift examples are available. [Pg.1450]

For example, if the molecular structure of one or both members of the RP is unknown, the hyperfine coupling constants and -factors can be measured from the spectrum and used to characterize them, in a fashion similar to steady-state EPR. Sometimes there is a marked difference in spin relaxation times between two radicals, and this can be measured by collecting the time dependence of the CIDEP signal and fitting it to a kinetic model using modified Bloch equations [64]. [Pg.1616]

We carry out computer simulations in the hope of understanding bulk, macroscopic properties in temis of the microscopic details of molecular structure and interactions. This serves as a complement to conventional experiments, enabling us to leam something new something that cannot be found out in other ways. [Pg.2239]

Figure B3.3.1. Simulations as a bridge between the microscopic and the macroscopic. We mput details of molecular structure and interactions we obtain predictions of phase behaviour, structural and time-dependent properties. Figure B3.3.1. Simulations as a bridge between the microscopic and the macroscopic. We mput details of molecular structure and interactions we obtain predictions of phase behaviour, structural and time-dependent properties.
Reinhardt W P 1982 Complex coordinates in the theory of atomic and molecular structure and dynamics Ann. Rev. Phys. Chem. 35 223... [Pg.2327]

G. Herzberg, Molecular Spectra and Molecular Structure., Vol. 3, Van Nostrand Princeton, NJ, 1966. [Pg.177]

R. de L Kronig, Band Spectra and Molecular Structure, Cambridge University Press, New York, 1930, p. 6. [Pg.216]


See other pages where 4’- molecular structures is mentioned: [Pg.42]    [Pg.151]    [Pg.217]    [Pg.272]    [Pg.282]    [Pg.369]    [Pg.411]    [Pg.56]    [Pg.67]    [Pg.359]    [Pg.137]    [Pg.137]    [Pg.171]    [Pg.823]    [Pg.1071]    [Pg.1073]    [Pg.1075]    [Pg.1243]    [Pg.1317]    [Pg.1382]    [Pg.1499]    [Pg.2341]   
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