## 4 Experimental
### X-ray Crystallography  
Diffraction experiments were carried out at room temperature with an Oxford Diffraction Xcalibur E diffractometer using Mo K\(\alpha\) radiation for **2** and at 131 K with an Oxford Diffraction SuperNova diffractometer using Cu K\(\alpha\) radiation for **8b**. Diffraction data were processed with CrysAlisPro software [21]. In case of **2** the structure was determined from a twinned specimen. The structures were solved with the program SHELXT [22] and refined by full-matrix least-squares method on \(F^{2}\) with SHELXL-2018/3 [23] within the Olex2 software [24]. Hydrogen atoms were placed in calculated positions and refined as riding on their carriers, except that of the O-H group in **2** which was freely refined. CCDC 2082365-2082366 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge via [[http://www.ccdc.cam.ac.uk/conts/retrieving.html](http://www.ccdc.cam.ac.uk/conts/retrieving.html)]([http://www.ccdc.cam.ac.uk/conts/retrieving.html](http://www.ccdc.cam.ac.uk/conts/retrieving.html)) (or from the CCDC, 12 Union Road, Cambridge CB2 1 EZK; Fax: +44-1223-336033; E-mail: [EMAIL_ADDRESS]).  
Crystal data for **2** (C\({}_{11}\)H\({}_{10}\)NO, \(M\) = 172.20 g/mol): triclinic, space group P-1 (no. 2), \(a\) = 7.7520(6) A, \(b\) = 7.9402(6) A, \(c\) = 8.0287(7) A, \(a\) = 75.284(7)\({}^{\circ}\), \(b\) = 70.571(7)\({}^{\circ}\), \(c\) = 81.744(6)\({}^{\circ}\), \(V\) = 449.81(7) A\({}^{3}\), \(Z\) = 2, \(T\) = 293(2) K, _u_(Mo K\(\alpha\)) = 0.082 mm\({}^{-1}\), _D\({}_{calc}\)_ = 1.271 g/cm\({}^{3}\), 9045 reflections measured (6.52\({}^{\circ}\)\(\leq\) 2\(\Theta\)\(\leq\) 50.02\({}^{\circ}\)), unique 3294 (\(R_{\rm int}\) = 0.031, R\({}_{\rm sigma}\) = 0.0292) which were used in all calculations. The final \(R_{1}\) was 0.0361 (I \(>\) 2\(\sigma\)(I)) and _wR\({}_{2}\)_ was 0.0893 (all data). Hydrogen atoms of the methyl groups are disordered due to the rotation of the methyl group around the C-C bond. The molecule of **2** is shown in Figure 1.  
Crystal data for **8b** (C\({}_{38}\)H\({}_{32}\)N\({}_{6}\)O\({}_{4}\).5H\({}_{2}\)O, \(M\) = 726.77 g/mol): triclinic, space group P-1 (no. 2), \(a\) = 16.5969(5) A, \(b\) = 18.1134(4) A, \(c\) = 19.4666(6) A, \(a\) = 104.252(2)\({}^{\circ}\), \(b\) = 95.940(3)\({}^{\circ}\), _\(\gamma\) = 105.512(2)\({}^{\circ}\), \(V\) = 5374.9(3) A\({}^{3}\), \(Z\) = 6, \(T\) = 131 K, _u_(CuK\(\alpha\)) = 0.806 mm\({}^{-1}\), _D\({}_{calc}\)_ = 1.347 g/cm\({}^{3}\), 52232 reflections measured (4.762\({}^{\circ}\)\(\leq\) 2\(\Theta\)\(\leq\) 136.5\({}^{\circ}\)), 19659 unique (\(R_{\rm int}\) = 0.0341, R\({}_{\rm sigma}\) = 0.0394) which were used in all calculations. The final \(R_{1}\) was 0.0563 (I \(>\) 2\(\sigma\)(I)) and _wR\({}_{2}\)_ was 0.1561 (all data). One of the carboxylate groups and one of the ethylene bridges are disordered over two sites. The molecule of **8b** is shown in Figure 4.  
Conceptualization, [PERSON] and J.F.; methodology, [PERSON] and M.G.; software, [PERSON] and M.G.; validation, J.S., J.F., P.W. and M.G.; formal analysis, J.S. and M.G.; investigation, [PERSON], J.F., P.W. and M.G.; resources, [PERSON]; data curation, [PERSON] and M.G.; writing--original draft preparation, [PERSON] and M.G.; writing--review and editing, [PERSON] and M.G.; visualization, [PERSON] and M.G.; supervision, [PERSON]; project administration, [PERSON]; funding acquisition, [PERSON] All authors have read and agreed to the published version of the manuscript.  
This work partially supported by Polish Ministry of Science and Higher Education and National Science Centre, research grant IP2012 055472.  
Not applicable.  
The authors declare no conflict of interest.