John Bacsa

Anatomy and formation of Br···O=C halogen and nonclassical hydrogen bonds and  pi···pi stacking: insights from the conservative electronic force fields in the molecular crystal and the supermolecule of 1-(5-bromopyridin-2-yl)ethan-1-one link.springer.com/article/10.100… @SN #SNAuthor

@DrHelenFry The Fieseler Storch (Stork) had extreme STOL performance, and its typical landing distance was only about 18–20 meters. It would land in the middle of town squares.

Can you share an unusual or little-known fact about a specific WW2 aircraft?

See this Instagram video by @tardibabe instagram.com/reel/DWRjtrRjl…

Sometimes I feel like that guy in the lab environment ...

The best use of Festschrift in an article title. Seriously, a good read.

@SchelterGroup @Nature Of course not. For example, where are all the unpaired electrons in its stable states?

@Nature No

Could the discovery of a catalyst in which aluminium shifts easily between oxidation states be the beginning of the end for costly transition-metal catalysts? go.nature.com/3MzUIwm

@tamuxray There's a town called Fouriesburg in South Africa that is also dear to crystallographers!

Structure Texas. A small community very dear to the crystallographers. tshaonline.org/handbook/entri…

@Robert_Palgrave This results from maximizing the number of interactions between the needles, similar to how molecules behave during crystallization. The entropy and religion point is something else (maybe): order arising from mind! The mind-matter relationship is not clear.

Not getting involved in the theology of nails but a cool thing about this system is that entropy is higher (not lower) when the nails are aligned because they have more ways they can move (along their axis) compared with the unaligned state. This is what drives the nematic phase in liquid crystals, explained by Lars Onsager.

@skdh e^{iπ} + 1 = 0

In which I wonder whether we will just have to accept that the laws of nature are ugly youtube.com/watch?v=OBHdT2…

@skdh Beauty is in the eye of the beholder (not bee holder).

A Rational Design of Chiral Iron(III) Complexes for Photocatalytic Asymmetric Radical Cation (4 + 2) Cycloadditions and the Total Synthesis of (+)-Heitziamide A | Journal of the American Chemical Society pubs.acs.org/doi/10.1021/ja…

@shaoliangzheng @IUCr p.s. I have seen this before and it was often a sign of twinning (the true space group symmetry was lower).

@shaoliangzheng @IUCr If the crystals rotated polarized light, then the symmetry must have been lowered. However, the symmetry may still be sufficient for the structure to be refined in a centrosymmetric space group, the local symmetry is lower. The symmetry violations in the X-ray data may be weak.

😱"Notably, despite crystallizing in achiral point groups (-1 and 2/m), the crystals exhibit optical activity"? 😳 That’s not consistent with basic crystallographic #symmetry. 🤔 doi.org/10.1002/adma.2… @IUCr #crystallography #education

Diverse N2 Functionalization Enabled by an Unsymmetric Dititanium Complex | Journal of the American Chemical Society pubs.acs.org/doi/10.1021/ja…

The orbital-like distributions of electron density can be measured

I remember being taught in undergrad chemistry that the wavefunction ψ is not a physical quantity that can be measured directly, though ψ² is. So orbitals are not physical objects you can measure directly. Though undeniably true, orbitals are useful tool for chemistry.

@Mike_Batt The other side is that dogs are usually completely dependent on humans for food and water. It cannot be easy for them when they are hungry and thirsty!

Dogs have it so easy. They don't have to do anything to keep being told they are a good boy.

@Mike_Batt Could be partly due to shared ancestry...most people with long English histories are distantly related in some way.

My granny thought I looked like Steve Davis when I was younger, my mum thought I looked like Benny Hill when HE was younger) , the filling station guy called me Mr Anderson (thinking I was Clive) and I was also mistaken for Martin McGuinness. And I was once handed a Simply Red album to sign, by a German fan! 😂

Huge congratulations to the Ackerman-Biegasiewicz group on their flash communication in ACS Organometallics: Probing Fe Complex Assembly via Thermogravimetric Analysis! pubs.acs.org/doi/10.1021/ac…

Jack, Aaron, and Maya present an online angular overlap calculator, which can calculate d-orbital splitting for any geometry. Play with it here: aom.hunter-lab.com. Student and teacher manuals in J. Chem. Ed. pubs.acs.org/doi/full/10.10… @ACSPublications @NUChemistry