2026-04-13T05:59:48Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/117102025-03-18T06:01:38Zcom_2072_452955com_2072_2054col_2072_453073

00925njm 22002777a 4500 dc Fontanet Cepeda, Mònica author Rodríguez Pizarro, Montserrat author Fontrodona, Xavier author Romero García, Isabel author Viñas Teixidor, Clara author Teixidor Bombardó, Francesc author info:eu-repo/date/embargoEnd/2026-01-01 2015 New dinuclear carboranylcarboxylate-bridged and mononuclear copper(II) compounds containing the 1-CO2H-2-H-1,2-closo-C2B10H10 carborane ligand (LH) have been synthesized from the previously synthesized dinuclear compound [Cu-2(mu-L)(4)(THF)(2)], 1. Reaction of LH with CuSO4 in THF leads to the dinuclear compound [CCu2(mu-L)(4)(THF)(2)], 1. The reaction of 1 with different terminal pyridyl ligands leads to the formation of a series of structurally analogous complexes by substitution of the terminal ligand THF (L-t = py, 2; p-CF3-py, 3; p-CH3-py, 4), which maintain the structural Cu-2(mu-O2CR)(4) core in most of the cases except for o-(CH3)(2)-py where a mononuclear compound (5) is exclusively obtained. In the case of 2 and 4, other dinuclear compounds [Cu-2(L)(4)(L-t)(4)], 2' and 4' are obtained in lower yield. These compounds have been characterized using analytical, spectroscopic (NMR, IR, UV-visible) and electrochemical techniques (CV, DPV). X-ray analysis revealed a paddle-wheel structure for the main dinuclear compounds with a square-pyramidal geometry around each copper ion and the carboranylcarboxylate ions bridging two copper atoms in syn-syn mode. In the case of 2' and 4' there are two carboranylcarboxylate ions bridging the copper atoms in syn-anti mode whereas the other two adopt a monodentate coordination mode. The mononuclear complex obtained with the o-(CH3)-py ligand presents a square-planar structure, in which the carboranylcarboxylate ligand adoptsmonodentate coordination. The effect of the substituent group on the cluster of the carboranylcarboxylate ligands on the reactivity of compound 1 is also discussed This research was financed by MEC of Spain through projects, CTQ2010-21532-C02-01, CTQ2013-44670-R, European Union (COST Action CM1302-Smart Inorganic Polymers) and the Generalitat de Catalunya (2014 SGR 149) Coure -- Compostos Copper compounds Enllaços d'hidrogen Hydrogen bonding Reaccions químiques Chemical reactions Intramolecular hydrogen bonding stabilizes the nuclearity of complexes. A comparative study based on the H-carborane and Me-carborane framework