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OpenStem
@openstem · Joined Jul 2026
7420 public items8 groups
Note~462 words · 2 min
Chemistry Without a Solvent: Mechanical Activation Most synthetic organic chemistry dissolves reactants in a solvent so that molecules can diffuse together and react homogeneously. Mechanochemistry instead brings solid reactants into intima
Chemistry · L5 · Mechanochemistry
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Chemistry · L5 · MechanochemistryNote~472 words · 2 min
Building Porous Crystals by Design A metal-organic framework assembles two kinds of well-defined molecular building blocks — metal-oxo clusters called secondary building units (SBUs) and multitopic organic linkers — into an extended, crysta
Chemistry · L5 · Metal-Organic Frameworks
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Chemistry · L5 · Metal-Organic FrameworksNote~491 words · 2 min
One Excitation, Two New Redox Powers A ground-state Ru(bpy)₃²⁺ or Ir(ppy)₃ complex is a modest, often kinetically sluggish, redox partner. Absorbing visible light promotes an electron from a metal-centered orbital into a ligand π* orbital —
Chemistry · L5 · Photoredox Catalysis
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Chemistry · L5 · Photoredox CatalysisNote~548 words · 3 min
Affinity Is Not One Number — It Is Two A binding constant Ka (or its inverse, Kd) is a single equilibrium number, but it is the net result of two very different physical contributions: enthalpy (ΔH, the heat of forming specific bonds and co
Chemistry · L5 · Protein-Ligand Binding Thermodynamics
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Chemistry · L5 · Protein-Ligand Binding ThermodynamicsNote~566 words · 3 min
Timing the Untimeable: Radical Clocks Some radical reactions are too fast to time by direct spectroscopic observation. A radical clock substrate contains a unimolecular rearrangement with a precisely known rate constant — classically cyclop
Chemistry · L5 · Advanced Radical Chemistry
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Chemistry · L5 · Advanced Radical ChemistryNote~564 words · 3 min
Why Averages Hide the Interesting Behavior Ordinary bulk spectroscopy reports a signal averaged over an enormous population of molecules — roughly Avogadro's number of them in a typical solution sample. If different molecules in that popula
Chemistry · L5 · Single-Molecule Spectroscopy
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Chemistry · L5 · Single-Molecule SpectroscopyNote~482 words · 2 min
Why Combine Electrochemistry with Spectroscopy Cyclic voltammetry measures current as a function of potential and, from peak positions and shapes, infers a formal potential, an approximate electron count, and a qualitative sense of reversib
Chemistry · L5 · Spectroelectrochemistry: Watching Electron Transfer Happen
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Chemistry · L5 · Spectroelectrochemistry: Watching Electron Transfer HappenNote~514 words · 3 min
Planning a Total Synthesis: Working Backward Total synthesis planning starts from the target and works backward. Corey's retrosynthetic analysis applies a disconnection — the conceptual reverse of a known forward reaction — to break the tar
Chemistry · L5 · Total Synthesis Strategy
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Chemistry · L5 · Total Synthesis StrategyNote~583 words · 3 min
Chemistry at the Timescale of a Vibrating Bond A single molecular vibration completes in roughly 10 to 100 femtoseconds (1 fs = 10⁻¹⁵ s) — so to watch atoms actually move as a bond breaks or forms, rather than only comparing the reactant st
Chemistry · L5 · Ultrafast Femtochemistry
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Chemistry · L5 · Ultrafast FemtochemistryNote~501 words · 3 min
Acid Sites Built into a Crystalline Pore A zeolite is a crystalline aluminosilicate whose corner-sharing SiO4 and AlO4 tetrahedra define a precise, molecular-scale network of pores and channels. Because each Al³⁺ substituting for Si⁴⁺ in th
Chemistry · L5 · Zeolite Catalysis
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Chemistry · L5 · Zeolite CatalysisPlot1 plot · 2 params
Chemistry · L3 · Acid–Base Titration Curve
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Chemistry · L3 · Acid–Base Titration CurvePlot1 plot · 2 params
Chemistry · L3 · Concentration vs Time (Reactant Decay)
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Chemistry · L3 · Concentration vs Time (Reactant Decay)Plot1 plot · 1 param
Chemistry · L3 · Rate vs Concentration (First-Order)
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Chemistry · L3 · Rate vs Concentration (First-Order)Plot1 plot · 2 params
Chemistry · L4 · Strong Acid-Strong Base Titration Curve
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Chemistry · L4 · Strong Acid-Strong Base Titration CurvePlot1 plot · 1 param
Chemistry · L4 · Beer-Lambert calibration curve
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Chemistry · L4 · Beer-Lambert calibration curvePlot1 plot
Chemistry · L4 · Relative effusion rate vs molar mass (Graham's Law)
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Chemistry · L4 · Relative effusion rate vs molar mass (Graham's Law)Plot1 plot
Chemistry · L5 · Electron-transfer rate vs driving force (the Marcus curve)
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Chemistry · L5 · Electron-transfer rate vs driving force (the Marcus curve)Plot1 plot · 2 params
Chemistry · L5 · Michaelis-Menten Velocity vs Substrate Concentration
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Chemistry · L5 · Michaelis-Menten Velocity vs Substrate ConcentrationPlot1 plot
Chemistry · L5 · Lithium-Ion Discharge Voltage Curve
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Chemistry · L5 · Lithium-Ion Discharge Voltage CurvePlot1 plot
Chemistry · L5 · Fuel Cell Polarization Curve
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Chemistry · L5 · Fuel Cell Polarization CurvePlot1 plot · 1 param
Chemistry · L5 · Transient Absorption Exponential Decay
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Chemistry · L5 · Transient Absorption Exponential DecayMoleculeO=C=O
Chemistry · L1 · Carbon Dioxide (CO₂)
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Chemistry · L1 · Carbon Dioxide (CO₂)MoleculeO=C=O
Chemistry · L2 · Carbon Dioxide (CO₂)
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Chemistry · L2 · Carbon Dioxide (CO₂)