Question

In addition to interacting with s and p orbitals of ligands such as NH,, CN, etc., d orbitals can also interact with other d-orbitals, resulting in the formation of metal-metal bonds. Thus, for a simple metal dimer (i.e., ignoring any other ligands), we can envision the following interactions: M1M2 ? bond bond 8 bond where the o bond represents a face-to-face interaction between the two d orbitals. Considering only the d orbitals on each metal and taking the metal-metal bond as the z-axis, draw a qualitative molecular orbital diagram for the M,M2 dimer shown above. Be sure to label your diagram clearly. (Note: you do not need to use group theory for this problem.) a) b) Being fascinated by the whole idea of metal-metal bonding, you run into the lab and prepare two dinuclear Mo compounds. Elemental analysis reveals that the oxidation states of the metals for each compound can be formulated as Mo'Mo" (i.e., each compound has two Mo ions whose oxidation states are +1 and +2). The room-temperature effective magnetic moment of compound A ÎsHeff = 1.8, whereas compound B hasHeff-39. Based on these data and your diagram from part (a), what can you infer about the relative strength of the metal-metal bonding in these two molecules? Explain.

Answer 1

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