Solid state coordination chemistry of oxomolybdenum–organodiphosphonate materials: consequences of introducing xylyldiphosphonate components†
Abstract
Hydrothermal syntheses were used to prepare compounds of the oxomolybdenum/xylyldiphosphonate and oxomolybdenum/M(II)–imine/xylyldiphosphonate families. Four compounds exhibited unadorned molybdophosphonate chains with the common {Mo5O15(O3PR)2}4− building unit: (4,4′-H2dpa)2[Mo5O15(1,2-O3PC8H8PO3)]·H2O (1·H2O), (4,4′-H2dpa)2[Mo5O15(1,3-O3PC8H8PO3)] (2), [Cu(terpy)2](H3O)[Mo5O15(1,4-O3PC8H8PO3)]·H2O (3·H2O), and [Co(2,2′-bpy)3](H3O)[Mo5(H2O)O14(1,4-O3PC8H8PO3)]·6H2O (4·6H2O). The pentanuclear building unit is preserved in the one-dimensional materials [{Cu(2,2′-bpy)2}2Mo5O15(1,4-O3PC8H8PO3)]·6H2O (5·6H2O), [{Cu(H2O)2(o-phen)}2Mo5O15(1,4-HO3PC8H8PO3)]·4H2O (6·4H2O), and (4,4′-Hbpy)[Ni(H2O)4(4,4′-Hbpy)}Mo5O15(1,2-O3PC8H8PO3)]·4H2O (8·4H2O), while a modified, protonated pentanuclear core is observed for [{Cu(H2O)(o-phen)}2(1,4-HO3PC8H8PO3H)][{Cu(o-phen)(H2O)}Mo5O14(OH)(1,4-O3PC8H8PO3)]2 (7), a material that also exhibits two discrete one-dimensional substructures. In contrast, the one-dimensional [{Ni(H2O)(tpypyz)}2Mo6O18(H2O)(1,4-O3PC8H8PO3)]·6H2O (9·6H2O) is constructed from hexanuclear molybdate clusters, and the two-dimensional [{Ni2(H2O)4(tpypyz)}Mo4O10(1,4-O3PC8H8PO3)2]·4H2O (10·4H2O) exhibits a unique tetranuclear core unit. The three-dimensional phase, [{Ni(H2O)(2,2′-dpa)}2Mo5O15(1,4-O3PC8H8PO3)]·2H2O (11·2H2O), reverts to the prototypical pentanuclear building unit. When the HF/Mo ratio of the reaction is increased from 4 : 1 to 8 : 1 or higher, three examples of oxyfluoromolybdate containing materials are observed: the one-dimensional [{Cu(o-phen)}2Mo2F5O4(OH)(H2O)4(1,3-O3PC8H8PO3)]·H2O (12·H2O); a structure displaying two discrete bimetallic oxyfluoride chains, [{Cu(terpy)2(OH)(H2O)}Mo2F4O3(1,2-O3PC8H8PO3)][{Cu(terpy)(H2O)}Mo2F3O4(1,2-O3PC8H8PO3)]·H2O (13·H2O); and a three dimensional compound, [{Cu3(bpy)2}Mo2F2O4(H2O)2(1,3-O3PC8H8PO3)2] (14). The structures of these materials are compared to those of previously described phases of the oxomolybdate/M(II)–imine/organophosphonate and oxyfluoromolybdate/M(II)–imine/organophosphonate families.
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