Themed collection Nitrogen Ligands

From the 6th EuCheMS Conference on Nitrogen Ligands (Beaune 2015) to an NJC themed issue.

Personal historical comments relating to the advancement of porphyrin syntheses using monopyrroles, dipyrroles, and open-chain tetrapyrroles are presented.

A critical overview of the very recent literature on heterogeneous electrochemical catalysis of CO₂ reduction with organic metal modified electrodes is summarized by taking into account different functionalization methods.

Strapped porphyrin ligands exhibit instantaneous and easy-to-control formation of various bimetallic species featuring new coordination modes and dynamics.

A di-n-hexylammonium ion was selectively encapsulated in the cavity of tailed porphyrins due to induced fit and lipophilic interactions.

The synthesis of aza(dibenzopyrro)methenes (ADBMs) using aryl boron compounds as templates is described. Compounds (1–3) are structurally related to the BODIPYs and were isolated with terminal imine, oxo, or mixed imine-oxo groups. Compounds 1–3 were investigated for their absorption/emission properties, and were probed by DFT and TDDFT methods.

A pyrazole aza-macrocyclic Cu²⁺ metallocage shows the inclusion of a water molecule not hydrogen bonded with any acceptor or donor groups of the cage.

Novel tetrapyridylethanes and bis-phenylpyridylmethylenepyrans as potential ligands for coordination chemistry.

The intercalation of a diiminoisoindoline–porphyrin conjugate into the poly(dG–dC) double helix occurs by inducing the fast formation of the helix with temperature.

Tetraalkylbacteriochlorins, available upon acid-mediated self-condensation of α-ester stabilized dihydrodipyrrin-carboxaldehydes, provide valuable models of the naturally occurring bacteriochlorophylls.

Proper fusion of fluorescence mechanisms in a single fluorophore unit is highly desirable to obtain better sensitivity, as well as selectivity towards a particular metal ion.

Three new mixed-ligand coordination polymers have been synthesized based on 3,3′-(anthracene-9,10-diyl)diacrylate acid and different N-donor ligands. Complex 2 displays rapid and selective sensing of Fe³⁺.

Annulation of thiophene to the BODIPY/aza-BODIPY core showed a significant impact on the spectral properties of the resulting scaffolds.

Two novel zinc-metallated porphyrins, bearing three and six long alkoxy chains at the periphery, have been synthesized as sensitizers in DSSCs.

Spectroscopy, structures, electrochemical behavior and magnetic properties of a series of readily prepared [(R-ONO)M(μ-4,4′-bipy)M(R-ONO)] complexes (R = anisyl or ferrocenyl; M = Ni, Cu) have been explored.

The palladated porphyrin Pd·TEGPy is an efficient turn-on, quadruplex-selective fluorophore thanks to peculiar supramolecular and electronic properties that results in a unique DNA structure-specific sensitization mechanism.

A single isomer of many topologically possible ones! The experimentally isolated metallacalix[4]arenes based on pyrimidine nucleobases are the energetically more favorable.

Four new copper(II)–polypyridyl complexes having tail groups with increasing aromaticity, hydrophobicity and planarity are synthesized. These complexes are found to be avid DNA binders and show efficient nuclease activity under either chemical stimulus or UV-A light irradiation.

Four novel copper(II) complexes based on guanidine derivatives have been synthesized by addition of N,N-heterocyclic ligands, and their interesting biological activities have been evaluated.

Novel and facile synthesis of a triazole based bisconjugated triazaspirodecanone as a potential MRI contrast agent.

Increasing inhibitory effect of Zn-Hp₂DAP < Hp₂DAP < Co-Hp₂DAP on ABC transporter MDR1 drug efflux pump.

Supramolecular architectures based on copper(II) complexes with diethoxyphosphoryl substituted 1,10-phenanthrolines are reported.

2,4 and 2,5-bis(benzooxazol-2′-yl)hydroquinone (DHBO) scaffolds show fluorescence stemming from an ESIPT process but also act as chelates toward boron fragments.

The synthesis, structures and properties of 3-pyrrolyl BODIPYs containing five membered aromatic heterocycles such as pyrrole, thiophene and furan at the meso-position are described.

The introduction of one or two nitriles on the bridge of reinforced cyclams paves the way for the synthesis of new bifunctional chelating agents. X-ray structures of the chelators and of two copper complexes are reported.

Two series of cofacial bis(dipyrrins) were prepared and their photophysical properties as well as their bimolecular fluorescence quenching with C₆₀ were investigated.

Nitrogen- and oxygen-containing macrocycles with an endocyclic quinoline moiety synthesized via Pd(0)-catalyzed amination were found to be prospective fluorescent chemosensors for Cu(II).

Novel organotin(IV) azides were employed as building blocks to prepare various organotin(IV) tetrazolides or triazolides.

Rhenium NHC complexes bound to azide anions readily react with alkynes to form the corresponding triazolate complexes, a new class of photochemically active species.

Heteroleptic terpyridyl complexes of Fe(II) and Ru(II) are synthesized. They are characterized using complimentary techniques and their optical and electrochemical properties are studied. A detailed computational study was also performed.

A series of symmetric and unsymmetric β,β′-dibenzo-3,5,8-triaryl-BODIPYs were synthesized and their spectroscopic properties were evaluated and compared.

Novel five-membered-ring and six-membered-ring bis-(diphenylboron) complexes are reported.

The N-substituent on quinonoid zwitterions influences the molecules packing and impacts their anchoring on gold surfaces.

A two-step methodology to prepare a series of meso-tetraarylporphyrin conjugates bearing water-soluble moieties, anchoring groups and receptor subunits.

A di-copper(II) complex is formed in a bis-tren cage featuring a thioether function, capable of grafting on a monolayer of gold nanostars.

An efficient medium-scale synthesis and the structural characterization of a series of macrobicyclic hexaaza-dithia macrocycles with pendant donor arms is presented.

The formation of ternary species containing zinc or uranyl–salophen complexes has been explored and analyzed in this work.

Zn(II) porphyrin dyes have been synthesized in three steps and exhibited power conversion efficiencies of 2.1 to 4.2% which depend on the electron donating ability of the R group.

Ni, Pd and Co bis(indazol-1-yl)methane complexes assemble into 3D-networks based on intermolecular electrostatic, H-bonds and aromatic interactions.

The properties of MIL-100(Fe) nanoparticles as vehicles of a non-conventional half-sandwich ruthenium(II) metallodrug in simulated intravenous conditions have been investigated.

Four cobalt(II) coordination polymers have been synthesized under hydrothermal conditions, and their magnetic behaviors have been discussed in detail.

The synthesis, characterisation and catalytic activity of FMNP@TD–Cu(II) for the synthesis of 1,4-disubstituted 1,2,3-triazoles are reported.

In the presence of sodium ascorbate, recyclable CuAAC precatalysts displayed high activity allowing the synthesis of a wide variety of 1,4-disubstituted 1,2,3-triazoles in high isolated yields.

Selective “naked eye” and fluorescent sensing of biothiols by visible-light excitable α- and β-formyl BODIPYs 1 and 3 was developed.