Cobalt(ii) and copper(ii) supramolecular networks with a 1-iminoisoindoline asymmetric pincer

Abstract

The first synthesis and characterization of cobalt(II) and copper(II) complexes with an in situ prepared novel asymmetric trinitrogen isoindoline-based pincer type ligand, N-(2-picolyl)isoindoline-1-(2-picolyl)imine (pap), are reported. Single-crystal X-ray structures of the cis-[M(pap)Cl 2 ] (M ¼ Cu, Co) complexes reveal the presence of rare seven-membered chelate rings as well as various coordination geometries and packing modes. The water-soluble complexes were found to react with dicarboxylate ions, terephthalate (ta) and succinate (suc), forming three new compounds {[M(H 2 O)(pap)] 2 (m-ta)}$ta$xH 2 O (M ¼ Cu and Co) and {[Co(pap)(suc)]$xH 2 O} n . Their single-crystal X-ray structures are reported and discussed. The rigid ta ions facilitate the formation of binuclear hydrated supramolecular frameworks, whereas the flexible suclinker binds [Co(pap)] 2+ moieties into 1D zigzag chains. The chains are non-covalently organized into a supramolecular network. The bulky pincer ligand, responsible for the luminescent properties, was found to be inert in these reactions and to facilitate a unique supramolecular architecture through p-p stacking interactions. The compounds presented in this work may have wider applicability, as molecular building blocks, in the construction of either discrete polynuclear clusters or extended networks with desirable properties. 12-6340515 † Electronic supplementary information (ESI) available: Graph-set analysis of hydrogen bonding of 1 and 2, comment on the renement of 5, ATR-FTIR spectra for 1-5, TG and PXRD data for 3-5, molecular structure of 4, crystal packing in 1, conductivity measurements for 1 and 2 in aqueous solutions. CCDC 974887, 974888, 980973, 980974 and 1023714. For ESI and crystallographic data in CIF or other electronic format see

Electrocatalytic property, anticancer activity, and density functional theory calculation of [NiCl(P^N^P)]Cl.EtOH

“…The Ni(II) coordination sphere includes one tridentate ligand that forms two five-member rings and one Cl atom at trans position to N atom of PNP ligand (Figure 3). The P1 Ni P2 angle is 170.86 (6) , and the deviation from the ideal value for square-planar coordination is due to the steric constraints of the chelating ligand. The length of the bonds for Ni P1, Ni P2, and Ni N are 2.1927 (16), 2.1930(16), and 1.934(5) Å, respectively, which indicates that the phosphorus atoms are located at the same distance from the central metal.…”

“…Pincer-type molecules/ions are an exciting class of ligands that have received increasing attention in modern organometallic chemistry. [1][2][3] Metal complexes of pincer-type ligands have been successfully employed for a wide variety of applications including supramolecular chemistry, [4][5][6] antibacteria, [7] anticancer, [8][9][10][11][12] sensors, [13,14] and of course for catalytic reactions (heterogenic and homogenic). [15][16][17][18][19][20][21][22][23][24] The earliest synthesis of these ligands dates back to 1976 but it wasn't until in 1989 that van Koten applied the term "pincer" word for this group of ligands.…”

Experimental and theoretical quantum chemical studies of 2-(2-acetamidophenyl)-2-oxo-N-(pyridin-2-ylmethyl)acetamide and its copper(II) complex: molecular docking simulation of the designed coordinated ligand with insulin-like growth factor-1 receptor (IGF-1R)

“…These ligands have become important for their bioinorganic and medicinal purposes [ 11 , 12 ], and they may bind meridional or vicinal to a metal. Picolylamine can act as a bridging ligand as well [ 13 ] but it is known that the bridging mode of chelation of picolylamine is rare in case of copper (II) complexes [ 14 ]. The interaction of Cu(II) with various picolylamine derivatives containing substitution at the secondary nitrogen center has also been widely investigated [ 15 – 25 ], a number of such complexes are effective reagents for the interaction and the oxidative cleavage of DNA [ 26 – 32 ].…”