On the various other hand, why periodically nitrogen creates 4 bonds?
I\"d prefer to try answer the inquiry from the title regarding the maximum number of atoms nitrogen is qualified of bonding with, and also slightly increase my comment.
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Metal nitrido complexes are typically known to have actually up to 6 steel centers bound through a solitary bridging $\\ceN3−$ ion, located in an octahedral cavity. One interstitial nitrogen can add 5 electrons, and the rest is detailed by the group 9 and 10 metals which are electron-rich (typically, $\\ceRh$, $\\ceIr$).
There are couple of more exceptions wherein formal C.N. For nitrogen is 7: complexes that lithium amides based on $\\ce\\Li14N10\\^6-$ cluster framework <1,2> and an consist of nitrido-cluster $\\ce\\Co2RhN2\\^3-$ <3>. Unfortunately in both crystal structures <1,2> with 6- and 7-fold combination nitrogens that $\\ceN-Ar$ teams those are greatly disordered. Framework <3> is much more suitable because that the representation.
Cluster main point wireframe version without carbonyl ligands:
Atom $\\mathrmN1$ with C.N. 7 is coordinated with 6 cobalts and also 1 rhodium, developing a capped trigonal prism.
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Interestingly enough, $\\mathrmCo1$ is a capping atom, no rhodium:
N1 SYMM Co5 Co4 Co6 Co3 Co2 Rh1 Co1Co5 1.90 i - - - - - - - Co4 1.91 i 135.0 - - - - - - Co6 1.92 i 79.5 80.2 - - - - - Co3 1.98 ns 129.7 85.1 80.2 - - - - Co2 2.00 i 82.3 140.2 128.4 75.4 - - - Rh1 2.18 i 80.7 81.1 128.3 144.9 95.3 - - Co1 2.43 ns 143.5 70.3 136.5 66.4 70.1 78.6 - Both interstitial nitrogens play the duty of internal ligands, which provide cluster valence electron (CVE), yet don\"t contribute to steric hindrance in between external ligands such together carbonyls, do the cluster more stable <4, ch. 1.18>