1,2,4-Triazolyl-4-acetate: a ditopic ligand combining soft and hard donor sites in homometallic (Ag^I) and heterometallic (Ag^I/U^VI) coordination polymers

Abstract

A 1,2,4-triazol-4-yl-acetic acid (trGly-H) was used for the synthesis of AgI and AgI/UVI coordination polymers. The composition space diagram was built for the AgNO3/trGly-H/UO2(NO3)2·6H2O system shows the crystallization fields of two AgI/UVI-compounds were found.

Ni(2,2′:6′,2″-Terpyridine-4′-carboxylate)2 Zwitterions and Carboxylate Polyanions in Mixed-Ligand Uranyl Ion Complexes with a Wide Range of Topologies

“…Ni2 is in a trans -N 2 O 4 octahedral environment [Ni–O, 2.021(3) and 2.039(3) Å, Ni–N, 2.096(3) Å]. Uranium and nickel bonding modes are thus in agreement with expectations based on the “soft” and “hard” characters of the donors. , The carboxylate group of tpyc – is bridging two uranium atoms in the μ 2 -κ 1 O :κ 1 O ′ mode, while one carboxylate group of nta 3– , directed away from the nickel atom, is κ 2 O , O ′-chelating uranium, another is bridging uranium and nickel centers in the anti/anti μ 2 -κ 1 O :κ 1 O ′ mode, and the last is monodentate on the same nickel atom, each nta 3– being thus bound to three metal cations. If Ni­(tpyc) 2 and Ni­(nta) 2 4– are considered as 4-c nodes, together with uranium atoms which are also 4-c nodes, the framework is 3-nodal, and it has the {4 2 ·8 3 ·10}­{4 2 ·8 4 } 3 point symbol.…”

“…The uranium atom is chelated by one carboxylate group from nta 3− and bound to three more oxygen donors from two tpyc − and one nta 3− anions. Ni2 is in a transcharacters of the donors 79,80. The carboxylate group of tpyc − is bridging two uranium atoms in the μ 2 -κ 1 O:κ 1 O′ mode, while one carboxylate group of nta 3− , directed away from the nickel atom, is κ 2 O,O′-chelating uranium, another is bridging uranium and nickel centers in the anti/anti μ 2 -κ 1 O:κ 1 O′ mode, and the last is monodentate on the same nickel atom, each nta3− being thus bound to three metal cations.…”

Crystal structure of catena-poly[[methanoldioxidouranium(VI)]-μ-2-[5-(2-oxidophenyl)-1H-1,2,4-triazol-3-yl]acetato-κ2 O:O′]

“…While the number of crystal structures of uranyl acetate complexes in the CSD amounts to 125 hits, those with ligands incorporating an acetate functionality in the 1,2,4-triazole ring are limited to three examples. These are Ag + /UO 2 2+ MOFs based on 1,2,4-triazol-4-yl-acetic acid derivatives (FUHGAT; Senchyk et al, 2020;SIRYAX and SIRYEB;Senchyk et al, 2022). The compounds have uranium(VI) in a pentagonalbipyramidal {UO 7 } arrangement similar to (I), and are distinguished by the acetato group coordination mode, which provides exclusively monodentate coordination to uranyl ions.…”