Effect of chalcogen bonding interactions on molecular structures; theoretical and crystallographic studies on two palladium(ii) acetate complexes

New palladium complexes, [Pd(L)(OAc))], have been synthesized. The complexes and their ligand have been characterized by X-ray crystal structure analysis. Interestingly, the molecular structures of the two complexes are stabilized by S⋯O chalcogen bonds.

New heteroleptic [Ni(ii) 1,1-dithiolate-phosphine] complexes: synthesis, characterization and electrocatalytic oxygen evolution studies

Four new heteroleptic Ni(ii) complexes with general formula [Ni(ii)(LL')] (L = 2-(methylene-1,1'-dithiolato)-5-phenylcyclohexane-1,3-dione (L1) and 2-(methylene-1,1'-dithiolato)-5,5'-dimethylcyclohexane-1,3-dione (L2); L' = 1,2-bis(diphenylphosphino)ethane (dppe) and bis(diphenylphosphino)monosulphide methane (dppms) have been synthesized and characterized by elemental analysis and spectroscopy (IR, UV-Vis, 1H, 13C{1H} and 31P{1H} NMR). All complexes 1-4 have also been characterized by PXRD and single crystal X-ray crystallography. The solid state molecular structures revealed distorted square planar geometry about the four-coordinate Ni(ii) metal centre together with rare NiH-C intra/intermolecular anagostic interactions in axial positions. In these complexes supramolecular structures have been sustained by non-covalent C-HO, C-OH-O, C-Hπ, C-Hπ (NiCS2, chelate), ππ and HH interactions. Their electrocatalytic properties have been investigated for oxygen evolution reaction (OER) in which complex 2 showed the highest activity with 10 mA cm-2 at the potential of 1.58 V vs. RHE. In addition, complex 2 also exhibits an OER onset potential at 1.52 V vs. RHE.

Synthesis and characterization of new square planar heteroleptic cationic complexes [Ni(ii) β-oxodithioester-dppe]+; their use as a catalyst for Chan–Lam coupling

Six new structurally characterized heteroleptic cationic [Ni(ii) β-oxodithioester-dppe]⁺PF₆⁻ complexes as efficient catalysts for Chan–Lam coupling reaction affording N-arylated products with significant functional group tolerance.

Distinct Palladium(II) Carbene Complexes Supported by Six-Membered 1,3-Disubstituted Permidin-2-ylidene, Six-Membered N-Heterocyclic Carbenes

The first synthesis, isolation, and characterization of permidin-2-ylidene complexes of Pd(II) is reported with entry resulting from either a direct reaction with isolable six-membered N-heterocyclic carbene or from the enetetramine, arising from dimerization of the carbene. Furthermore, a simplified method to prepare N,N'-disubstituted perimidinium bromide salts, precursors to 1,3-disubstituted perimidin-2-ylidene, was achieved using ammonium bromide as a source of weak acid. Through synthesis and nuclear magnetic resonance spectroscopic analysis of a carbene-phosphinidine adduct, an interrogation of the fundamental π-bonding ability of 1,3-diisopropylperimidin-2-ylidene revealed this interaction to be weak and of a similar order to unsaturated imidazol-2-ylidenes.

Cooperative metal–ligand influence on the formation of coordination polymers, and conducting and photophysical properties of Tl(i) β-oxodithioester complexes

Eight novel luminescent and semiconducting Tl(i) β-oxodithioester complexes forming 1D/2D coordination polymeric structures were investigated using single crystal X-ray diffraction.

Proton reduction reaction catalyzed by homoleptic nickel bis-1,2-dithiolate complexes: Experimental and theoretical mechanistic investigations

A series of homoleptic monoanionic nickel dithiolene complexes [Ni(bdt)2](NBu4), [Ni(tdt)2](NBu4), and [Ni(mnt)2](NBu4) containing the ligands benzene-1,2-dithiolate (bdt2-), toluene-3,4-dithiolate (tdt2-) and maleonitriledithiolate (mnt2-), respectively, have been employed as electrocatalysts in the hydrogen evolution reaction with trifluoroacetic acid as proton source in acetonitrile. All complexes were active catalysts with TONs reaching 113, 158 and 6 for [Ni(bdt)2](NBu4), [Ni(tdt)2](NBu4), and [Ni(mnt)2](NBu4), respectively. Faradaic yield for hydrogen evolution reaction reaches 88 % for 2- , which also displays the minimal overpotential requirement value (467 mV) within the series. Two pathways for H2 evolution can be hypothesized that differ on on the sequence of protonation and reduction steps. DFT calculations are in agreement with experimental data and indicate that protonation at sulfur follows reduction to the dianion. Hydrogen evolves from the direduced-diprotonated form via a highly distorted nickel hydride intermediate. The effects of acid strength and concentration in the hydrogen-evolving mechanism are also discussed.

Heteronuclear assembly of Ni–Cu dithiolato complexes: synthesis, structures, and reactivity studies

A mild route was discovered to synthesize heterometallic [Ni^IICu^I] complexes featuring square-planar Ni(ii) and distorted tetrahedral Cu(i).

Bidentate cycloimidate palladium complexes with aliphatic and aromatic anagostic bonds

Palladium(II) complexes of bidentate cycloimidate ligand systems with a triarylmethyl moiety exhibit exceptional downfield shifts in proton NMR spectra due to rare anagostic interactions.

Rare intermolecular M⋯H–C anagostic interactions in homoleptic Ni(ii)–Pd(ii) dithiocarbamate complexes

New Ni(ii)–Pd(ii) dithiocarbamates have been fully characterized;1exhibits rare C–H⋯Ni intermolecular anagostic interactions, whereas2shows C–H⋯Pd hydrogen bonding–anagostic interactions.

As-stereogenic C2-symmetric organoarsines: synthesis and enantioselective self-assembly into a dinuclear triple-stranded helicate with copper iodide

As-stereogenic C₂-symmetric organoarsines were safely synthesized from non-volatile precursors. The racemic mixture of the As-stereogenic ligands was enantioselectively self-assembled into a dinuclear triple-stranded helicate.

Intermolecular Tl⋯H–C anagostic interactions in luminescent pyridyl functionalized thallium(i) dithiocarbamates

Rare intermolecular C–H⋯Tl anagostic and C–S⋯Tl interactions forming a six-membered chelate ring.

Synthesis and structure of Ag(i), Pd(ii), Rh(i), Ru(ii) and Au(i) NHC-complexes with a pendant Lewis acidic boronic ester moiety

Synthesis and characterization of novel NHC-boronic ester ligands and their corresponding TM-complexes.

Intermolecular anagostic interactions in group 10 metal dithiocarbamates

The effects of substituents on the dithiocarbamate backbone on novel C–H⋯M and C–H⋯CG(CS₂M) (M = Ni, Pd, Pt) interactions have been investigated.

Exploring anagostic interactions in 5,15-porphodimethene metal complexes

By using 5,15-porphodimethene metal complexes, the weak noncovalent anagostic interaction is explored using variable temperature NMR studies and is further confirmed by single crystal X-ray analysis.