Mean and standard deviations of attention bias measures in the study.

<p>Mean and standard deviations of attention bias measures in the study.</p

Schematic of the speech task sequence.

<p>Schematic of the speech task sequence.</p

Mean and standard deviations of stress reactivity and recovery measures in the study.

<p>Mean and standard deviations of stress reactivity and recovery measures in the study.</p

Serial mediational models tested.

<p>Serial mediational models tested.</p

Schematic of the tasks sequence during the session.

<p>Schematic of the tasks sequence during the session.</p

Correlation between depression-related attention bias indices.

<p>Correlation between depression-related attention bias indices.</p

Fixation duration in negative over positive faces for each feedback slide during the speech comparing non-dysphoric and dysphoric participants.

<p>* in solid lines = between-group differences <i>p <</i> .05; * in broken lines = within-group differences <i>p <</i> .05; diff in sec = difference in seconds.</p

Schematic of trial presentations in the engagement-disengagement task.

<p>Schematic of trial presentations in the engagement-disengagement task.</p

Highly Fluorinated Tris(indazolyl)borate Hydrocarbyl Complexes of Calcium and Magnesium: Synthesis and Structural Studies

Heteroleptic phenylacetylide complexes [{F₁₂-Tp^4Bo,3Ph}­Ae­(CCPh)]_<i>x</i> of calcium (Ae = Ca, <i>x</i> = 2; <b>2</b>) and magnesium (Ae = Mg, <i>x</i> = 1; <b>4</b>) containing the highly fluorinated 3-phenyl hydrotris­(indazolyl)­borate {F₁₂-Tp^4Bo,3Ph}⁻ ligand have been synthesized by acid–base reactions between the corresponding silylamido derivatives [{F₁₂-Tp^4Bo,3Ph}­Ae­{N­(SiRMe₂)₂}] (R = Me, Ae = Ca (<b>1</b>); R = H, Ae = Mg (<b>3</b>)) and PhCCH. Compounds <b>2</b> and <b>4</b> have been characterized by NMR spectroscopy and X-ray diffraction analysis. <b>2</b> crystallizes as a dinuclear complex, showing two nonsymmetrical “side-on” (π-type) interactions between the acetylide units and the Ca centers, whereas <b>4</b> crystallizes as a mononuclear complex, displaying a four-coordinate magnesium. The molecular structure of the complex [{F₁₂-Tp^4Bo,3Ph}­Mg­{N­(SiMe₂H)₂}] (<b>3</b>), obtained by the salt metathesis reaction between [Mg­{N­(SiMe₂H)₂}₂] and [Tl­{F₁₂-Tp^4Bo,3Ph}], is also reported. <b>3</b> is also four-coordinate and exhibits a Mg···β-Si–H agostic distortion. The synthesis and in situ characterization of the heteroleptic alkyl complex [{F₁₂-Tp^4Bo,3Ph}­Ca­{CH­(SiMe₃)₂}­(THF)] (<b>5</b>) is also reported, although attempts to isolate this compound failed due to its extreme sensitivity to temperature

β‑H Abstraction/1,3‑CH Bond Addition as a Mechanism for the Activation of CH Bonds at Early Transition Metal Centers

This article describes the generalization of an overlooked mechanism for CH bond activation at early transition metal centers, namely 1,3‑CH bond addition at an η²-alkene intermediate. The X-ray-characterized [Cp₂Zr­(<i>c</i>-C₃H₅)₂] eliminates cyclo­propane by a β‑H abstraction reaction to generate the transient η²-cyclo­propene [Cp₂Zr­(η²-<i>c</i>-C₃H₄)] intermediate <b>A</b>. <b>A</b> rapidly cleaves the CH bond of furan and thiophene to give the furyl and thienyl complexes [Cp₂Zr­(<i>c</i>-C₃H₅)­(2-C₄H₃X)] (X = O, S), respectively. Benzene is less cleanly activated. Mechanistic investigations including kinetic studies, isotope labeling, and DFT computation of the reaction profile all confirm that rapid stereo­specific 1,3‑CH bond addition across the Zr­(η²-alkene) bond of <b>A</b> follows the rate-determining β‑H abstraction reaction. DFT computations also suggest that an α‑CC agostic rotamer of [Cp₂Zr­(<i>c</i>-C₃H₅)₂] assists the β‑H abstraction of cyclo­propane. The nature of the α‑CC agostic interaction is discussed in the light of an NBO analysis