Bent molecular shape

This molecule is of the type AX2E it has a trigonal planar electron-group geometry and a bent molecular shape. 

In H2O, the two H atoms and two lone pairs around O point to the comers of a tetrahedron. The H- O- H bond angle of 105° is close to the theoretical tetrahedral bond angle of 109.5°. Water has a bent molecular shape, because two of the groups around oxygen are lone pairs of electrons. 

C1F2] After the removal of one F during the reaction, the central Cl atom is now surrounded by four electron pairs two bonding and two lone electron pairs. This results in a tetrahedral electron group geometry and a bent molecular shape. 

As shown above, the unique structural feature of centropolyindanes is the mutual fusion of several cyclopentane rings each of which being annelated to a benzene nucleus. A number of other combinations of these ring elements can be considered as C diindanes ,C triindanes etc. which in most cases lack a saturated tertiary or quaternary carbon atom. As illustrated in Schemes 3 and 4, tetra-hydrobenzo[d,e]pentalene 19 is one of the very few exceptions. Molecules of this type have a strained, bent molecular shape [1,53]. The tetrahydroindacenes 20 and 21, acenaphthene (23) and fluorene (24) are clearly planar, as are the threefold congener trindane (22) [54] and fluoranthene (25) and its congeners [55]. 

To account for other molecular shapes within a given electron-group arrangement, we postulate that one or more of the hybrid orbitals contains lone pairs. In ozone (O3), for example, the central O is sp hybridized and a lone pair fills one of its three sp orbitals, so ozone has a bent molecular shape. 

Which compoimd does NOT have a bent molecular shape ... 

The passage from diatomic to triatomic molecules leads to the doublesided world of linear and bent molecular shapes. Although strictly correlated, the respective rovibrational spectra require distinct treat-... 

The double carbon-carbon bond of saturated fatty acids results in the possible formation of two varieties (isomers) in this cis isomer, hydrogen atoms are adjacent, whereas they are on opposite sides in trans isomers. Cis fatty acids have a bent molecular shape, trans fatty acids are more linear, and similar to saturated fatty acids. Fatty acids containing multiple double bonds also occur in fats and oils, and these offer cis-trans isomer possibilities at each double bond. The difference in... 

On the atomic scale, water s great solvent power arises from the uneven distribution of electron charge and a bent molecular shape, which create a polar molecule ... 

Bent molecular shape. The sequence of the H—O—H atoms in water is not linear the water molecule is bent with a bond angle of 104.5°. In the baU-and-stick model of Figure 4.1C, the polar arrow points to the negative pole, and the tail, shaped like a plus sign, marks the positive pole. 

The atomic properties of H and O result in water s bent molecular shape, polarity, and H-bonding ability. 

In the last 10 years a very large number of different ring systems have been introduced into liquid crystal chemistry [35 a, 36]. Many of them are not very effective in terms of their mesogenity, and may be considered merely as curiosities. Table 14 presents some examples. Spiro ring systems such as compound numbers 1 and 9 in Table 14 are not planar rather, the rings are perpendicular one to another. This causes an unfavourable bent molecular shape. In seven-mem-bered rings (compound number 6) the directions of the substituent bonds are not parallel, which also leads to a bent molecular shape. Compound number 7 is derived from... 

---