Accessing yttrium-polyoxometalate-carboxylate hybrids from a versatile arsenotungstate(III) precursor

作者：Healey Merinda R; Gable Robert W; Ritchie Chris^*; Boskovic Colette

来源：Polyhedron, 2013, 64: 13-19.

DOI：10.1016/j.poly.2013.01.058

• Polyoxometalates
• Yttrium
• Arsenotungstate
• Picolinate ligands

Exploration of the reactivity of the versatile polyoxometalate precursor [As2W19O67(H2O)](14-) with yttrium salts and organic proligands derived from 2-picolinic acid: 2,5-pyridinedicarboxylic acid (pdcH(2)) and 5-(methoxycarbonyl)-2-pyridinecarboxylic acid (mcpcH), has afforded the three new hybrid complexes [Y{AsW8O30}(2)(AsO)(2){WO2(pdc)}(2)](13-) (1) and [{Y(H2O)(3)}(2){As2W19O68}{WO2(L)}(2)](8-) (L- = pdcH(-) (2) or mcpc(-) (3)). The structurally-related and organic ligand free species [{Y(H2O)(3))(4){Y(H2O)(6))(2){As2W19 O-68}(2){WO3(H2O)}(4)(AsO)(2)](20-) (4) was also obtained. Structural characterization of the mixed salts of the four complexes, K8H5[1]center dot 9H(2)O, K2.5H5.5[2]center dot 37H(2)O, K2.5H5.5[3]center dot 34H(2)O and K6Na2H4[4]center dot 30H(2)O, has revealed that five membered N,O-chelated {WO2(L)} units play a key structural role in complexes 1-3. With no picolinate-based ligand present in 4, additional arsenite fragments bind to the analogous tungsten coordination sites.

• 出版日期2013-11-12