Tetrel Bonding and Other Non-Covalent Interactions Assisted Supramolecular Aggregation in a New Pb(II) Complex of an Isonicotinohydrazide

A new supramolecular Pb(II) complex[PbL(NO2)](n)was synthesized from Pb(NO3)(2),N'-(1-(pyridin-2-yl)ethylidene)isonicotinohydrazide (HL) and NaNO2.[PbL(NO2)](n)is constructed from discrete [PbL(NO2)] units with an almost ideal N(2)O(3)square pyramidal coordination environment around Pb(II). The ligandL(-)is coordinated through the 2-pyridyl N-atom, one aza N-atom, and the carbonyl O-atom. The nitrite ligand binds in a kappa(2)-O,O coordination mode through both O-atoms. The Pb(II) center exhibits a hemidirected coordination geometry with a pronounced coordination gap, which allows a close approach of two additional N-atoms arising from the N=C(O) N-atom of an adjacent molecule and from the 4-pyridyl N-atom from the another adjacent molecule, yielding a N(4)O(3)coordination, constructed from two Pb-N and three Pb-O covalent bonds, and two PbMIDLINE HORIZONTAL ELLIPSISN tetrel bonds. Dimeric units in the structure of[PbL(NO2)](n)are formed by the PbMIDLINE HORIZONTAL ELLIPSISN=C(O) tetrel bonds and intermolecular electrostatically enforced pi+MIDLINE HORIZONTAL ELLIPSIS pi(-)stacking interactions between the 2- and 4-pyridyl rings and further stabilized by C-HMIDLINE HORIZONTAL ELLIPSIS pi intermolecular interactions, formed by one of the methyl H-atoms and the 4-pyridyl ring. These dimers are embedded in a 2D network representing a simplified uninodal 3-connectedfes(Shubnikov plane net) topology defined by the point symbol (4 center dot 8(2)). The Hirshfeld surface analysis of [PbL(NO2)] revealed that the intermolecular HMIDLINE HORIZONTAL ELLIPSISX (X = H, C, N, O) contacts occupy an overwhelming majority of the molecular surface of the [PbL(NO2)] coordination unit. Furthermore, the structure is characterized by intermolecular CMIDLINE HORIZONTAL ELLIPSISC and CMIDLINE HORIZONTAL ELLIPSISN interactions, corresponding to the intermolecular pi MIDLINE HORIZONTAL ELLIPSIS pi stacking interactions. Notably, intermolecular PbMIDLINE HORIZONTAL ELLIPSISN and, most interes