Elongated bond

The properties such as gel time and exotherm peak temperature, mechanical properties, that is, tensile strength and percent elongation, bond strength with... 

The Ni(III) complexes can be isolated as solids, and some of their X-ray crystal structures have been determined (113, 120, 120a). The Ni(III) complexes are usually found to have an octahedral geometry with axially elongated bonds, and the square-planar complex is extremely rare. The X-ray structural parameters for some Ni(III) complexes are summarized in Table VI. The average Ni—N bond distances of octahedral Ni(III) complexes are ca. 0.1 A longer than those of the... 

The mass spectrum of trans-2-hexene shows a very strong peak at M-29. Compare the geometry of trans-2-hexene radical cation to that of trans-2-hexene. Is there any indication for pending loss of a neutral fragment of mass 29 (Pay particular attention to elongated bonds.) Explain. If there is, identify the ionic and neutral fragments. Examine both the spin density surface and electrostatic potential map for trans-2-hexene radical cation. Does this show evidence for any particular fragmentation Explain. 

An X-ray structure of the photochromic spirobenzothiopyran 46 shows an elongated bond from sulfur to the spiro carbon atom while the bond from S to the aromatic ring is shortened. Irradiation at 365 nm cleaves the former bond and generates the zwitterionic blue-green merocyanine with an s-trans, s-trans conformation in the solid state (Equation 3). In solution, NMR studies indicate an s-trans, s-cis conformation <2002JOC533>. 

All the chromium-carbon distances from C-l to C-4 range between 214 and 221 pm. Remarkably, the carbon atom, which is connected only via the H bridge with the central metal, also has a short distance of 235.5(2), or 239.9(4) pm to Cr, respectively, much shorter than the van der Waals radii of both atoms. The bridging hydrogen shows elongated bond length to C, in comparison with the other C—H bonds. The Cr—H—C angle is about 100°. 

Steric strain generally leads to elongated bond lengths as compared to the expected values given in Tables 14.3.3 and 14.3.4. 

In the first formula the double bonds occur between the outer pairs of carbon atoms, as in the normal formula of butadiene, whereas in the second case the double bond is located between the middle pair of carbon atoms and there is an elongated bond between the outer carbon atoms. Here the integrals Aai, Aac and Acdy which are the exchange integrals for the bonds ab ac and cd are approximately equal and will be denoted by a thus... 

This correction is quite nontrivial in this case and reduces the barrier by 1.22 kcal mol"1 (see Table 3). Note that part of the loss in the barrier is due to the fact that the activated complex is loose compared to the adsorption complex. Structures with many elongated bonds lend to have lower frequencies of... 

Elongated bonds in bold and italics. See Chart 20 and Table IV for more details. 

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