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2D supramolecular structure for a chiral heterotrinuclear ZnII2HoIII complex through varied H-bonds connecting solvates and counterions
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1  Dpt. of Inorganic Chemistry. Universidade de Santiago de Compostela. 15782. SPAIN


We report the crystal structure of [Zn2HoIII(L)(ald)(HO)(H2O)3(MeCN)](NO3)2·EtOH [being H3L = 2-(5‑bromo-2-hydroxy-3-methoxyphenyl)-1,3-bis[4-(5-bromo-2-hydroxy-3-methoxy phenyl)-3-azabut-3-enyl]-1,3-imidazolidine); and Hald = 5‑bromo-2-hydroxy-3-methoxybenzaldehyde]. Despite the presence of two bulky multidentate ligands, as well as several monodentate ligands surrounding the nonacoordinated holmium cation, and the two pseudooctahedral zinc ions, the intricate H-bonded system formed by this chiral heterotrinuclear complex is only expanded in a 2D supramolecular structure. The interactions involve the nitrate counterions and the solvated ethanol, in such way that each complex unit is connected to an identical enantiomer, and to two units of inverted chirality through H bonds

Keywords: H-bond system, metallosupramolecular structure, heterotrinuclear complex, holmium, lanthanide
Comments on this paper
Cándida Pastor
Comment and question
Very interesting structure, I have some questions, will they carry out mangetic studies? and How viable is it to prepare the Zinc compound before and not everything from the beginning?

Ana Garcia-Deibe
Answers to questions
Thanks, for your comments and interest. Regarding to your questions:
1st Q: No, we cannot measure by the moment, as we do not have got enough pure sample of this by-product.
2ndQ: The preparation of the Zn2(L)AcO metalloligand is simple and, finally, after multiple attempts, this was the best synthetic route.

Cándida Pastor
Ok, thank you for your answers.

Samuel Hernandez Anzaldo
Chemical features
The combination of 3d and +3d metal ions is always interesting and tricky to characterize, however you did a perfect job. Just two questions? 1) Did you try with a different Ho salt? or with a different anion? What did you get? or what would you excpect?
2) If you said that the deprotonated ald and the OH came from a hydrolyzes in the crystallization process, do you think you would be able to add different functional groups?
Have a nice day
Ana Garcia-Deibe
Thank you for your interest.

Regarding to your first question. We have to recognise that Ho was not our first option, so we do not use it very frequently. Consequently, we were using the only salt available in that moment. In my opinion, and as you probably suspect, another salt, or a less hydrated sample, could probably yield different results. But, we have stopped attempting, as this was not our preferred metal.

2nd Q: We have worked with this kind of ligands a long time, and other groups as well, and HO- and ald- are two of the ions "commonly" found after hydrolysis, so it sis not surprinsing. Of course, there are many other possibilities...

I hope to have solved your doubts. thank you again.