Jules Oppenheim

Is the right paper linked?

If you switch to manual grinders, you can get really nice burrs for <$200. The 1zpresso grinders are excellent.

Congratulations Stefano!!!!

Contact with Electrically Conductive Inert Solids Alters Intrinsic Heterogeneous Brønsted Acid Catalysis Interfacial electric fields at heterogeneous catalyst surfaces have been demonstrated to alter kinetics of liquid-phase reactions. In these systems, electric fields are generated from applying a poten...

This was such a cool project to watch develop. The rate of a purely thermochemical reaction is affected by physical contact of the solid catalyst with an inert electrically-conductive substrate. The rate is set by the OCP of the inert substrate.

pubs.acs.org/doi/10.1021/...

How did crystallographers function before the Bilbao server and ISOTROPY suite were invented?

The SynergyED is such a game changer. It's crazy going from an intractable microcrystalline powder to a structure in under an hour.

#3DED #microED #SynergyED

Thrilled to see my art on the cover of JACS!

Our first paper since the #MOF #NobelPrize and first collaboration with @stecanossa.bsky.social!

Alice performed one of the most detailed studies of MOF ion conductivity, rationalizing trends in cation type, charge carrier conc., and vacancy sites based on structure.

pubs.acs.org/doi/10.1021/...

New water sorbent paper alert, the new Cr-red-MOF-1 eclipses the maximum capacity record holder of Cr-soc-MOF-1 (doi.org/10.1016/j.ch...). The pore size is massive!

Cr-red-MOF-1: doi.org/10.26434/che...

Excited to share a project that has been years in the making!

We show that the asymmetric isomer of IRMOF-74-II forms a porous material with the local structure of a MOF-74 (such as maintaining open metal sites), but lacks global order.

pubs.rsc.org/en/content/a...

Beautiful >1" crystals grown over 5 years...
...unfortunately it is just NaHCO3

Not modulated like Na2CO3 (doi.org/10.1107/S010...)

Curious choice of aperiodic floor tiling in Tokyo

Brilliantly Red: The Structure of Carmine Carmine is a red pigment made from dried cochineal, a scale insect that has been a source of brilliant scarlet reds in clothing and art for more than two millennia, with records dating back to 700 BC....

Carmine is a red pigment used since antiquity to color textiles, in paintings by Rembrandt and Van Gogh, and today as a food coloring agent (E120).

Very excited that @esvenssongrape.bsky.social finally reveals the crystal structure of carmine by #3DED!

pubs.acs.org/doi/10.1021/...

High-resolution synchrotron X-ray study of icosahedrite, an icosahedral AlCuFe quasicrystal from the Khatyrka meteorite A single grain of the icosahedral AlCuFe quasicrystal extracted from the Khatyrka meteorite has been studied by means of high-resolution synchrotron X-ray diffraction at the ESRF. We found that the mi...

Cool diffraction from a meteorite: a modulated quasicrystal

journals.iucr.org/m/issues/202...

Thanks for the great work that you have done discovering this awesome system!

High-capacity water sorbent cycles without hysteresis under dry conditions - Nature Communications There is a lack of water sorbents capable of cycling water vapor under dry conditions without hysteresis or decomposition. Here, the authors demonstrate that the anionic MOF SU-102 exhibits high-capac...

Thrilled to share the last work from my PhD! We examined the pore cation effect on water sorption, finding hydrophilicity trends with a Hofmeister series (the cations are changing the "solubility of water in the MOF"). Mg-SU-102 is great at pulling water from dry air!

www.nature.com/articles/s41...

Hydrolytically Stable Phosphonate‐Based Metal–Organic Frameworks for Harvesting Water from Low Humidity Air https://onlinelibrary.wiley.com/doi/10.1002/smll.202503178?af=R

Interesting new results from the Long Lab! A series of lutetium metallocenes with spin density residing significantly in the 6s orbital.

pubs.acs.org/doi/10.1021/...

Adding some more detail: the Ni-rich's maximum capacity–step relative humidity metrics approach the empirical limit, and it is stable towards cycling, with minimal loss in working capacity over 100 cycles (cycled between 20–40% RH with a working capacity of 0.64 g/g).

Excited to share Karla's paper, finding a new highly connected benzotriazolate MOF! This framework is susceptible to metal exchange, and its water sorption is impressive.

Karla is now doing a PhD with Paul Chirik at Princeton. Keep an eye on her work in the future!

pubs.acs.org/doi/10.1021/...

For those who keep up with water sorbent literature, this new COF-309 is quite interesting. It has one of the highest maximum sorption capacities given the position of the condensation step, approaching the empirical limit we set last year.

pubs.acs.org/doi/10.1021/...

High-Energy, High-Power Sodium-Ion Batteries from a Layered Organic Cathode Sodium-ion batteries (SIBs) attract significant attention due to their potential as an alternative energy storage solution, yet challenges persist due to the limited energy density of existing cathode materials. In principle, redox-active organic materials can tackle this challenge because of their high theoretical energy densities. However, electrode-level energy densities of organic electrodes are compromised due to their poor electron/ion transport and severe dissolution. Here, we report the use of a low-bandgap, conductive, and highly insoluble layered metal-free cathode material for SIBs. It exhibits a high theoretical capacity of 355 mAh g–1 per formula unit, enabled by a four-electron redox process, and achieves an electrode-level energy density of 606 Wh kg–1electrode (90 wt % active material) along with excellent cycling stability. It allows for facile two-dimensional Na+ diffusion, which enables a high intrinsic rate capability. Growth of the active cathode material in the presence of as little as 2 wt % carboxyl-functionalized carbon nanotubes improves charge transport and charge transfer kinetics and further enhances the power performance. Altogether, these allow the construction of SIB cells built from an affordable, sustainable organic small molecule, which provide a cathode energy density of 472 Wh kg–1electrode when charging/discharging in 90 s and a top specific power of 31.6 kW kg–1electrode.

Best sodium-ion battery cathode out there, bar none! High energy, high power, long lasting, safe and cheap batteries made from C, N, O, H, and Na! #organicbattery #Sodiumbattery pubs.acs.org/doi/10.1021/...

MERRY CHRISTMOF. 💎🎄
Fresh from the press, our #MOFs #design review in Advanced Materials provides basic and advanced knowledge to design porous materials.
We curated beautiful examples to illustrate state of the art strategies, and we hope you'll like it!!
onlinelibrary.wiley.com/doi/10.1002/...

I am excited to share our group's latest manuscript, now live on the #ChemRxiv! We show by electron diffraction that Zn3(HOTP)2 isn't a typical 2D MOF, but is instead a 3D connected structure with incommensurate modulations. #crystallography

Read the preprint here: doi.org/10.26434/che...

You could 3D print the PORMAKE building blocks and add magnets/Lego type joints to each connection point

pubs.acs.org/doi/full/10....

github.com/Sangwon91/PO...

Here is Mathematica notebook to calculate the isosteric enthalpy of adsorption (here written for the Unilan model, but I can add for dual-site Langmuir or virial upon request). These fits use error propagation to generate error bars for the ∆H.

github.com/JulesOpp/Iso...

Here is a set of Mathematica notebooks to generate Tanabe-Sugano diagrams for d1 to d10.

github.com/JulesOpp/Tan...

Here you can adjust the Racah parameters, and use the equations to directly fit to experimental values. The diagrams are generated from doi.org/10.1143/JPSJ...

Hello Bluesky! Here are some useful resources that I've compiled over the years (1/n)

sites.mit.edu/oppenheim/wa...

A fairly comprehensive database of MOF and COF water sorption parameters (including capacity, RH, reference, and pore sizes). As used in our recent paper: doi.org/10.1021/jacs...