Axial Addition in Diastereoisomeric [Ni(Me8[14]ane)](ClO4)2 Complexes and Their Antifungal Activities

A series of diastereoisomeric square planar nickel(II) diperchlorate complexes, [Ni(L)](ClO4)2{L= isomeric Me8[14]ane (LAα, LBα or LCα)}undergo axial ligand addition reactions with NO3-, Cl-, Br-, SCN- or ClO4- to yield six coordinate octahedral derivatives [NiL(X)x(Y)y].z(H2O)(X=NO3,Cl, Br or SCN; Y= ClO4; x = 1 or 2; y = 1 or 0 and z = 0, 1 or 2). The products have been characterized on the basis of analytical, spectroscopic, magnetic and conductance data. All the derivatives are unstable in open air except one derivative and revert back to original square planar complexes. Antifungal activities of the ligands and their nickel(II) complexes have been investigated against some phytopathogenic fungi. The Chittagong Univ. J. Sci. 40(1) : 122-147, 2019

From Tetranuclear to Pentanuclear [Co‒Ln] (Ln = Gd, Tb, Dy, Ho) Complexes Across the Lanthanide Series: Effect of Varying Sequence of Ligand Addition

Two new families of cobalt(II/III)‒lanthanide(III) coordination aggregates have been reported: Tetranuclear [LnIII2CoIII2L2(N‒BuDEA)2(O2CCMe3)4(H2O)2]•(MeOH)n•(H2O)m (Ln = Gd, 1; Tb, 2; Dy, 3; n=2, m=10 for 1 and 2; n=6, m=2 for 3)...

ESCargo: a regulatable fluorescent secretory cargo for diverse model organisms

Exocytic membrane traffic can be visualized using regulatable fluorescent secretory cargoes. In cells from diverse eukaryotes, a red fluorescent fusion protein termed ESCargo can be trapped as aggregates in the endoplasmic reticulum and then released by ligand addition to create a wave of transport through the secretory pathway. This tool should have broad utility.

Control of single-ligand chemistry on thiolated Au25 nanoclusters

Diverse methods have been developed to tailor the number of metal atoms in metal nanoclusters, but control of surface ligand number at a given cluster size is rare. Here we demonstrate that reversible addition and elimination of a single surface thiolate ligand (-SR) on gold nanoclusters can be realized, opening the door to precision ligand engineering on atomically precise nanoclusters. We find that oxidative etching of [Au25SR18]− nanoclusters adds an excess thiolate ligand and generates a new species, [Au25SR19]0. The addition reaction can be reversed by CO reduction of [Au25SR19]0, leading back to [Au25SR18]− and eliminating precisely one surface ligand. Intriguingly, we show that the ligand shell of Au25 nanoclusters becomes more fragile and rigid after ligand addition. This reversible addition/elimination reaction of a single surface ligand on gold nanoclusters shows potential to precisely control the number of surface ligands and to explore new ligand space at each nuclearity.

The effect of coordination of alkanes, Xe and CO2 (η1-OCO) on changes in spin state and reactivity in organometallic chemistry: a combined experimental and theoretical study of the photochemistry of CpMn(CO)3

A study is presented of ligand addition reactions of the fragment 3CpMn(CO)2 formed upon photolysis of CpMn(CO)3.