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Molecular drawings

There are various molecular drawing packages available. One of these is ChemSketch and it is free to download from the internet. [Pg.46]

Figure 5. Molecular drawings of a) one single strand of an amylosic chain in the left-handed conformation, having a six-fold symmetry, repeating in 2.1 nm. b) the double-helix generated by the association of two single strands, through two-fold symmetry operation, c) and d) Space-filling plots of the double helix, projected along and perpendicular to the fiber axis, respectively. Figure 5. Molecular drawings of a) one single strand of an amylosic chain in the left-handed conformation, having a six-fold symmetry, repeating in 2.1 nm. b) the double-helix generated by the association of two single strands, through two-fold symmetry operation, c) and d) Space-filling plots of the double helix, projected along and perpendicular to the fiber axis, respectively.
Figure 6. Molecular drawings of the best arrangement of two anti-parallel double-helices, a) Projection perpendicular to the chain axis, b) Projection along the chain axis. Inter double-helix hydrogen bonds are shown as dotted lines. Figure 6. Molecular drawings of the best arrangement of two anti-parallel double-helices, a) Projection perpendicular to the chain axis, b) Projection along the chain axis. Inter double-helix hydrogen bonds are shown as dotted lines.
FIGURE 2.9 Molecular drawings such as these help in visualizing molecules, (a) Ball-and-stick models show individual atoms (spheres) joined together by covalent bonds (sticks), (b) Space-filling models accurately portray the overall molecular shape but do not explicitly show covalent bonds. [Pg.51]

The concept of electronic delocalization has germinated in the pre-electron period to Kekule s structural theory and its application to benzene as a prototype of a family of compounds so-called aromatics . Kekule had to address two major properties of benzene revealed from substitution experiments. The first was the empirical equivalence of all positions of benzene, what is called today the Dfjh symmetry of both geometry and electronic structure, and second the persistence of the aromatic essence in chemical reactions, what we recognize today as aromatic stability . Thus, Kekule postulated that there is a Ce nucleus and the four valences of the carbons are distributed to give two oscillating structures, which when cast in our contemporary molecular drawings look like part a in Scheme 2.39-44 One of the many alternative hypotheses on the nature of... [Pg.3]

Fig. 14. Molecular drawing of [Yb(btsa)2]2 indicating the close Yb-C(SiMe3) contacts... Fig. 14. Molecular drawing of [Yb(btsa)2]2 indicating the close Yb-C(SiMe3) contacts...
Fig. 16. Molecular drawings of Y[OSifBu2(CH2)3NMe2]3 (left) and Yb[OSi/Bu2(CH2)3NMe2]3 [OSitBu2(CH2)3NMe2H] (right) [118]... Fig. 16. Molecular drawings of Y[OSifBu2(CH2)3NMe2]3 (left) and Yb[OSi/Bu2(CH2)3NMe2]3 [OSitBu2(CH2)3NMe2H] (right) [118]...
Fig. 19. Molecular drawings of Y[OSifBu(C6H4-2-CH2NMe2)2][N(SiMe3)2L [128] and Yb [OCrBu(2-CH 2-NC5H 3-6-Me)2] 2[N(SiMe 3)2] [127]... Fig. 19. Molecular drawings of Y[OSifBu(C6H4-2-CH2NMe2)2][N(SiMe3)2L [128] and Yb [OCrBu(2-CH 2-NC5H 3-6-Me)2] 2[N(SiMe 3)2] [127]...
These indices are also 2D descriptors because they require a molecular drawing (or graph) in order to determine the number of bonds. [Pg.6]

Figure 5.6 (a) Molecular drawing for the double helix found in A and B starches. Each single strand of... [Pg.157]

Fig. 15.21. Molecular drawing depicting the size of 18-crown-6, with the tetraethylammonium cation fitting into the central cavity. Fig. 15.21. Molecular drawing depicting the size of 18-crown-6, with the tetraethylammonium cation fitting into the central cavity.
In uniaxial macroscopic deformation, the term draw ratio (DR) is customarily used to denote nominal draw (not molecular draw), or the change from the sample s initial dimension to its deformed state at each drawing step. Even though this is by no means a rigorous definition, it applies to deformations induced during simple sample extension or during stretching by differential roll speed. DR assumes full extension efficiency. [Pg.1977]

Affine deformation takes place when molecular draw ratio (MDR) = This is true in the... [Pg.1978]

Table la Results of molecular drawings representing the boding of liquid water, using the RADMASTE Molecular Stencd... [Pg.270]

As many as 81.2% of students used the RADMASTE Molecular Stencil in question 1.2, compared to 84.2% in question 1.1. Three students did not use the stencil. Only one student did not use the stencil in both questions 1.1 and 1.2. Two students, who used the stencil in question 1.1, did not do so for question 1.2. The reason for the change in these students approach to molecular drawings is not clear. [Pg.273]

Questions in future assignments should also make provision for text augmentation, and students explaining their molecular drawings [13]. The latter could be extended to interviews with students or with follow-up questions on models students have created. [Pg.284]


See other pages where Molecular drawings is mentioned: [Pg.288]    [Pg.245]    [Pg.88]    [Pg.175]    [Pg.178]    [Pg.168]    [Pg.164]    [Pg.1303]    [Pg.1303]    [Pg.217]    [Pg.9]    [Pg.1]    [Pg.263]    [Pg.265]    [Pg.266]    [Pg.267]    [Pg.269]    [Pg.271]    [Pg.273]    [Pg.275]    [Pg.277]    [Pg.279]    [Pg.281]    [Pg.282]    [Pg.283]    [Pg.283]    [Pg.284]    [Pg.286]    [Pg.474]    [Pg.475]   
See also in sourсe #XX -- [ Pg.292 ]




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