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1. Metal→Carbon Dative Bonding

   https://doi.org/10.1002/anie.202201841  

   Litle, Elishua D.; Gabbaï, François P. (April 2022, Angewandte Chemie International Edition)

   Abstract As part of our interest in unusual bonding situations, we are now targeting complexes featuring metal→carbon dative bonds. Here, we report on the formation of such linkages in a series of Group 10 complexes featuring a triarylphosphine ligand functionalized at the γ position by a carbenium ion. Through combined synthetic, spectroscopic, and computational studies, we show that the M→C_carbeniuminteraction present in these complexes scales with the basicity of the donor, confirming its dative nature. 

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2. Imidazole and 1-Methylimidazole Hydrogen Bonding and Nonhydrogen Bonding Liquid Dynamics: Ultrafast IR Experiments

   https://doi.org/10.1021/acs.jpcb.8b11299  

   Shin, Jae Yoon; Wang, Yong-Lei; Yamada, Steven A.; Hung, Samantha T.; Fayer, Michael D. (February 2019, The Journal of Physical Chemistry B)
3. Structure and Bonding in π-Stacked Perylenes: The Impact of Charge on Pancake Bonding

   https://doi.org/10.1021/jacs.3c14065  

   Bhattacharjee, Rameswar; Jervis, Henry; McCormack, Megan E.; Petrukhina, Marina A.; Kertesz, Miklos (April 2024, Journal of the American Chemical Society)
4. Unlocking the geometry of bonding

   https://doi.org/10.1038/s44160-024-00539-z  

   Li, Fangzhou; Ke, Chenfeng (July 2024, Nature Synthesis)
5. Hydrogen Bonding in Amorphous Indomethacin

   https://doi.org/10.3390/pharmaceutics16081002  

   Benmore, C J; Yarger, J L; Davidowski, S K; Shrader, C D; Smith, P A; Byrn, S R (July 2024, Pharmaceutics)

   Amorphous Indomethacin has enhanced bioavailability over its crystalline forms, yet amorphous forms can still possess a wide variety of structures. Here, Empirical Potential Structure Refinement (EPSR) has been used to provide accurate molecular models on the structure of five different amorphous Indomethacin samples, that are consistent with their high-energy X-ray diffraction patterns. It is found that the majority of molecules in amorphous Indomethacin are non-bonded or bonded to one neighboring molecule via a single hydrogen bond, in contrast to the doubly bonded dimers found in the crystalline state. The EPSR models further indicate a substantial variation in hydrogen bonding between different amorphous forms, leading to a diversity of chain structures not found in any known crystal structures. The majority of hydrogen bonds are associated with the carboxylic acid group, although a significant number of amide hydrogen bonding interactions are also found in the models. Evidence of some dipole–dipole interactions are also observed in the more structurally ordered models. The results are consistent with a distribution of Z-isomer intramolecular type conformations in the more disordered structures, that distort when stronger intermolecular hydrogen bonding occurs. The findings are supported by 1H and 2H NMR studies of the hydrogen bond dynamics in amorphous Indomethacin. 

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