Bond angles table

The four-coordinate 2,2 -bipyridyl and triazine adducts Me2Cd(bipy),3 (Me3SiCH2)2Cd(bipy), 5 and Me2Cd[(CH2 NMe)3]2 have been isolated, and the bipyridyl derivatives (4a) have been structurally characterized by X-ray diffraction. Notably, the coordination environments about the cadmium centers in both compounds deviate substantially from tetrahedral, with large C-Cd-C bond angles (Table 3). 

These have been quite extensive and results have been published for plastocyanin (51), azurin (52), stellacyanin (53), umecyanin (54), and rusticyanin (55) in both oxidation states. Fitting procedures are not sensitive to the inclusion of the Cu—S(Met) bond, and if the latter does contribute the best fit the bond distance obtained is not always reliable. In the case of azurin, the axial carbonyl group is not included in the fit. No information is obtained from EXAFS concerning bond angles. Table IV is a listing of data reported. It is noted that (average) Cu—N(His) bonds are persistently shorter than those obtained from... 

The Universal Force Field, UFF, is one of the so-called whole periodic table force fields. It was developed by A. Rappe, W Goddard III, and others. It is a set of simple functional forms and parameters used to model the structure, movement, and interaction of molecules containing any combination of elements in the periodic table. The parameters are defined empirically or by combining atomic parameters based on certain rules. Force constants and geometry parameters depend on hybridization considerations rather than individual values for every combination of atoms in a bond, angle, or dihedral. The equilibrium bond lengths were derived from a combination of atomic radii. The parameters [22, 23], including metal ions [24], were published in several papers. 

Table III-52 indicates the kinetic data for quatemization of 2- and 4-alkylthiazoles. The 8 value shows that the 4-positioiH more sensitive than the 2-position to steric effects, the bond angle HjCjN (123°6) being greater than that of HjQN (119 4). This result has been confirmed for all solvents and leaving groups (256).

Bond Distances, Bond Angles, and Bond Energies in Ethane, Ethene, and Ethyne (Table 9 1, p 342) Stmctures of a-Ammo Acids (Table 27 1, pp 1054-1055)... 

Table 3 Bond Lengths and Bond Angles of Three-membered Heterocyclic Compounds...

Table 1 Interatomic Distances and Bond Angles in Penicillins...

The tendencies of the amino acids to stabilize or destabilize a-helices are different in typical proteins than in polyamino acids. The occurrence of the common amino acids in helices is summarized in Table 6.1. Notably, proline (and hydroxyproline) act as helix breakers due to their unique structure, which fixes the value of the —N—C bond angle. Helices can be formed from either... 

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