TY - JOUR

T1 - Tetrel bonding stabilization of a new coordination polymer constructed from lead(ii) azide and 1-(pyridin-2-yl)ethylidenepicolinohydrazide

AU - Mahmoudi, Ghodrat

AU - Zangrando, Ennio

AU - Gurbanov, Atash

AU - Eftekhari-Sis, Bagher

AU - Mitoraj, Mariusz

AU - Sagan, Filip

AU - Safin, Damir

N1 - This work was supported by the Fundação para a Ciência e a Tecnologia (FCT), project UIDB/00100/2020 of Centro de Química Estrutural. A. V. Gurbanov acknowledges the FCT and Instituto Superior Técnico (DL 57/2016 and L 57/2017 Program, Contract no.: IST-ID/110/2018). M. P. Mitoraj and F. Sagan acknowledge Poland's high-performance Infrastructure PLGrid (HPC Centers: ACK Cyfronet AGH, PCSS, CI TASK, WCSS) for providing computer facilities.

PY - 2023

Y1 - 2023

N2 - In this work we report a new PbII coordination polymer [Pb3L2(N3)4]n, which was obtained from Pb(N3)2 and 1-(pyridin-2-yl)ethylidenepicolinohydrazide (HL). The complex exhibits a 1D polymeric chain, constructed from the {[Pb3(N3)4]2+}n backbone, decorated with deprotonated organic L− ligands. The latter ligands are pentadentate and link two metal cations. The PbII ions were found to be in a N5O or N5O2 coordination environment, formed by covalent bonds. The azide ligands either bind four metals in a μ4-1,1,3,3 coordination mode or are coordinated to metal centers as terminal ligands. All the metal centers exhibit a hemidirected coordination geometry with a pronounced coordination gap, which allows the close approach of an additional nitrogen atom arising from an adjacent terminal azide ligand. A simplified underlying network of [Pb3L2(N3)4]n, without considering Pb⋯N tetrel bonds, exhibits the tetranodal 3,4,4,4-connected chain topology, while considering all Pb⋯N tetrel bonds, the binodal 4,5-connected chain topology was shown. The crystal packing of [Pb3L2(N3)4]n is reinforced by intermolecular π⋯π stacking interactions, formed by PbII-based five-membered chelate metallocycles and pyridine rings. In-depth bonding analysis using ETS-NOCV, IQA and NCI methods demonstrates that although the azide anions experience significant steric crowding due to repulsive azide-azide interactions, they are engaged in strong attractive, Coulomb dominated, dative-covalent Pb-N and tetrel-type Pb⋯N connections, which are further augmented by weak exchange-correlation driven C-H⋯N hydrogen bonds as well as London dispersion forces due to metallocycle units. The diffuse reflectance spectrum of [Pb3L2(N3)4]n revealed a broad band with two maxima in the UV region, corresponding to intraligand transitions, and an intense shoulder in the visible region, corresponding to metal-to-ligand charge-transfer. The latter shoulder explains the observed yellow colour of the complex. © 2023 The Royal Society of Chemistry.

AB - In this work we report a new PbII coordination polymer [Pb3L2(N3)4]n, which was obtained from Pb(N3)2 and 1-(pyridin-2-yl)ethylidenepicolinohydrazide (HL). The complex exhibits a 1D polymeric chain, constructed from the {[Pb3(N3)4]2+}n backbone, decorated with deprotonated organic L− ligands. The latter ligands are pentadentate and link two metal cations. The PbII ions were found to be in a N5O or N5O2 coordination environment, formed by covalent bonds. The azide ligands either bind four metals in a μ4-1,1,3,3 coordination mode or are coordinated to metal centers as terminal ligands. All the metal centers exhibit a hemidirected coordination geometry with a pronounced coordination gap, which allows the close approach of an additional nitrogen atom arising from an adjacent terminal azide ligand. A simplified underlying network of [Pb3L2(N3)4]n, without considering Pb⋯N tetrel bonds, exhibits the tetranodal 3,4,4,4-connected chain topology, while considering all Pb⋯N tetrel bonds, the binodal 4,5-connected chain topology was shown. The crystal packing of [Pb3L2(N3)4]n is reinforced by intermolecular π⋯π stacking interactions, formed by PbII-based five-membered chelate metallocycles and pyridine rings. In-depth bonding analysis using ETS-NOCV, IQA and NCI methods demonstrates that although the azide anions experience significant steric crowding due to repulsive azide-azide interactions, they are engaged in strong attractive, Coulomb dominated, dative-covalent Pb-N and tetrel-type Pb⋯N connections, which are further augmented by weak exchange-correlation driven C-H⋯N hydrogen bonds as well as London dispersion forces due to metallocycle units. The diffuse reflectance spectrum of [Pb3L2(N3)4]n revealed a broad band with two maxima in the UV region, corresponding to intraligand transitions, and an intense shoulder in the visible region, corresponding to metal-to-ligand charge-transfer. The latter shoulder explains the observed yellow colour of the complex. © 2023 The Royal Society of Chemistry.

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U2 - 10.1039/D3CE00596H

DO - 10.1039/D3CE00596H

M3 - Article

VL - 25

SP - 5100

EP - 5108

JO - CrystEngComm

JF - CrystEngComm

SN - 1466-8033

IS - 36

ER -