N atomic orbitals NO molecular orbitals O atomic orbitals 2p 1 11 2p 11 |1 2s 2s N atom NO molecule O atom Figure 9.46 Energy Large 2s-2p interaction Small 2s-2p interaction B2 C2 N2 O2 F2 Nez oi, 1 1 1L 11 T2p 1 1 11 11 T2p 11 11 11 ož, 1L 1L 11 1L 11 11 o2s Bond order 2 3 2 Bond enthalpy (kJ/mol) Bond length (Å) Magnetic behavior 290 620 941 495 155 1.59 1.31 1.10 1.21 1.43 Paramagnetic Diamagnetic Diamagnetic Paramagnetic Diamagnetic A Figure 9.43 Molecular orbital electron configurations and some experimental data for period 2 diatomic molecules. Energy • |||
Carbon monoxide, CO, is isoelectronic to N2. (a) Draw a
Lewis structure for CO that satisfies the octet rule. (b) Assume
that the diagram in Figure 9.46 can be used to describe
the MOs of CO. What is the predicted bond order for
CO? Is this answer in accord with the Lewis structure you
drew in part (a)? (c) Experimentally, it is found that the
highest energy electrons in CO reside in a σ-type MO. Is
that observation consistent with Figure 9.46? If not, what
modification needs to be made to the diagram? How does
this modification relate to Figure 9.43? (d) Would you expect
the π2p MOs of CO to have equal atomic orbital contributions
from the C and O atoms? If not, which atom would
have the greater contribution?
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