Trinuclear {Sr[UO₂L₃]₂(H₂O)₄} and pentanuclear {Sr[UO₂L₃]₄}²⁻uranyl monocarboxylate complexes (L-acetate or n-butyrate ion)

Uranyl Coordination Compounds with Alkaline Earth Metals and Crotonate Ligands

“…However, pairs of such [UO 2 L 3 ] – units are further bound with one hydrated Ca 2+ cation, resulting in larger trinuclear neutral complex units {Ca(H 2 O) 3 [UO 2 (crt) 3 ] 2 } (Figure ). Similar trinuclear units were earlier reported for strontium and uranyl complexes with acetate and n ‐butyrate ligands …”

“…However, it seems that the elongation of hydrocarbon chain increases the tendency of binding of such smaller [UO 2 L 3 ] – units into larger heteronuclear clusters (in the presence of secondary metals). This tendency was proposed and discussed earlier, and recently we were able to solve crystal structures of several heteronuclear uranyl complexes with up to eight nuclei in the single cluster …”

Studies of Multicenter and Intermolecular Dihydrogen B–H···H–C Bonding in [4,8,8′‐exo‐{PPh3Cu}‐4,8,8′‐(μ‐H)3‐commo‐3,3′‐Co(1,2‐C2B9H9)(1′,2′‐C2B9H10)]

“…[65] The total energy of interactions per molecule, estimated as the sum of individual E A-B values, gives a reasonable value of 40.8 kcal mol -1 , which is 2.5 times as large as the value of 17.0 kcal mol -1 for 1-phenyl-o-carborane. [66] The molecular Hirshfeld surfaces and Voronoi tessellation give the same types of intermolecular bonds, and partial contributions of various types of intermolecular contacts to the total molecular area determined by both methods are similar ( Figure 5, c), as was recently demonstrated for small organic [67] and organometallic [55,68,69] compounds. It is worth noting that in the Voronoi tessellation approach bonding H···H contacts can be distinguished from nonbonding ones by the high value of the Voronoi polyhedron face common to two hydrogen atoms (Ͼ10 % of the full solid angle of 4π steradian, Table S6 in the Supporting Information), and also that the H···H interactions can be separated into B-H···H-C, C-H···H-C, and B-H···H-B contacts, which can be helpful for investigation of dihydrogen bonding in molecular crystals.…”

Unusual Heteronuclear Uranyl Clusters with Aliphatic Monocarboxylate Ligands and Coordination Modes of Crotonate, Butyrate, and Valerate Ions

“…Such examples include the crystal structure of the propionate‐containing compound {Ca(H 2 O) 5 [UO 2 L 3 ]}[UO 2 L 3 ] · H 2 O, where the hydrated Ca ion binds with the typical [UO 2 L 3 ] – anion with the formation of a binuclear cationic cluster {Ca(H 2 O) 5 [UO 2 L 3 ]} + . The acetate‐ and n ‐butyrate‐containing compounds [Sr(H 2 O) 6 ][UO 2 L 3 ] 2 {Sr(H 2 O) 4 [UO 2 L 3 ] 2 } 2 and {Sr(H 2 O) 4 [UO 2 L 3 ] 2 } · 2H 2 O, respectively, are constructed of trinuclear neutral clusters of the {Sr(H 2 O) 4 [UO 2 L 3 ] 2 } composition . Tetranuclear anionic clusters { R (UO 2 L 3 ) 3 } 2– were observed in the Ag‐ and acetate‐containing compound [Zn(H 2 O) 4 (EtOH) 2 ]{Ag[UO 2 L 3 ] 3 } .…”

“…Tetranuclear anionic clusters { R (UO 2 L 3 ) 3 } 2– were observed in the Ag‐ and acetate‐containing compound [Zn(H 2 O) 4 (EtOH) 2 ]{Ag[UO 2 L 3 ] 3 } . Pentanuclear anionic clusters {Sr[UO 2 L 3 ] 4 } 2– were found in the Cs‐, Sr‐, and acetate‐containing compound Cs 2 {Sr[UO 2 L 3 ] 4 } . Recently, the unprecedented neutral octanuclear clusters K[UO 2 L 3 ]{ R (H 2 O) 4 [UO 2 L 3 ] 2 } 2 were reported in the crystal structures of two similar K and Sr or Ba propionates of the uranyl ion K R 2 (H 2 O) 8 [UO 2 L 3 ] 5 , where R = Sr or Ba .…”