On the various other hand also, why periodically nitrogen creates 4 bonds?
I"d like to try answer the question from the title concerning the maximum number of atoms nitrogen is qualified of bonding through, and also also slightly expand my comment.
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Metal nitricarry out complexes are commonly recognized to have up to 6 steel centers bound with a solitary bridging $ceN3−$ ion, located in an octahedral cavity. An interstitial nitrogen deserve to add 5 electrons, and the rest is gave by the group 9 and 10 steels which are electron-well-off (frequently, $ceRh$, $ceIr$).
There are few more exceptions wright here formal C.N. for nitrogen is 7: complexes of lithium amides based on $ceLi14N10^6-$ cluster frame <1,2> and also an inclusion nitrido-cluster $ceCo2RhN2^3-$ <3>. Unfortunately in both crystal structures <1,2> via 6- and 7-fold coordinated nitrogens of $ceN-Ar$ groups those are greatly disordered. Structure <3> is more suitable for the representation.
Cluster core wireframe design without carbonyl ligands:
Atom $mathrmN1$ via C.N. 7 is coordinated via 6 cobalts and 1 rhodium, creating a capped trigonal prism.
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Interestingly enough, $mathrmCo1$ is a capping atom, not 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 I 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 I 143.5 70.3 136.5 66.4 70.1 78.6 - Both interstitial nitrogens play the function of interior ligands, which administer cluster valence electrons (CVE), yet don"t add to steric hindrance in between outside ligands such as carbonyls, making the cluster more secure <4, ch. 1.18>