Jeffrey L Petersen

The reaction of two equivalents of ,-bis(2-pyrrolylmethylidene)-1,2-phenylenediamine (Hbppda) with tetrabenzylzirconium provided the air- and moisture-stable eight-coordinate complex Zr(bppda). Temperature-dependent steady-state and time-resolved emission spectroscopy established weak photoluminescence (Φ = 0.4%...

The two commercially available zirconium complexes tetrakis(dimethylamido)zirconium, Zr(NMe), and tetrabenzylzirconium, ZrBn, were investigated for their utility as starting materials in the synthesis of bis(pyridine dipyrrolide)zirconium photosensitizers, Zr(PDP). Reaction with one...

Ni-catalyzed C-H functionalization reactions are becoming efficient routes to access a variety of functionalized arenes, yet the mechanisms of these catalytic C-C coupling reactions are not well understood. Here, we...

The photoluminescent eight-coordinate zirconium complex Zr(PMP) supported by four monoanionic 2-(2'-pyridine)pyrrolide ligands was synthesized. This molecule shows dual emission fluorescence and phosphorescence with an overall quantum efficiency of 4% at...

Photoluminescent molecules exploiting the sizable spin-orbit coupling constants of main group metals and metalloids to access long-lived triplet excited states are relatively rare compared to phosphorescent transition metal complexes. Here...

Among Earth-abundant catalyst systems, iron-carbene intermediates that perform C-C bond forming reactions such as cyclopropanation of olefins and C-H functionalization via carbene insertion are rare. Detailed descriptions of the possible...

A series of seven bis(pyridinedipyrrolide)zirconium complexes, Zr(PDP), where [PDP] is the doubly deprotonated form of [2,6-bis(5-R-3-R-1-pyrrol-2-yl)pyridine], were prepared and characterized in solution by NMR, UV/vis absorption, and emission spectroscopy and...

Photolysis of (MePMPMe)2ZrBn2 (MePMPMe = 3,5-dimethyl-2-(2-pyridyl)pyrrolide) in the presence of diphenylacetylene yields the first η4-cyclobutadienyl zirconium complex, (MePMPMe)2Zr(η4-C4Ph4), through formal [2+2] cycloaddition of two alkynes at a putative low-valent zirconium...

Advances in chemical control of the photophysical properties of transition-metal complexes are revolutionizing a wide range of technologies, particularly photocatalysis and light-emitting diodes, but they rely heavily on molecules containing...

Reaction of (PDP)Fe(thf) (HPDP = 2,6-bis(5-(2,4,6-trimethylphenyl)-3-phenyl-1H-pyrrol-2-yl)pyridine) with organic azides has been studied. The identity of the azide substituent had a profound impact on the transformation type and nature of the...