[Cr(dpa)(ox)2]–: a new bis-oxalato building block for the design of heteropolymetallic systems. Crystal structures and magnetic properties of PPh4[Cr(dpa)(ox)2], AsPh4[Cr(dpa)(ox)2], Hdpa[Cr(dpa)(ox)2]·4H2O, Rad[Cr(dpa)(ox)2]·H2O and Sr[Cr(dpa)(ox)2]2·8H2O (dpa = 2,2′-dipyridylamine)

Oxalato‐Bridged [CuIICrIII] and [MnIICrIII] Binuclear Complexes: Synthesis, Crystal Structures, Magnetic and EPR Investigations

“…Ϫ [AA ϭ 2,2Ј-bipyridine (bipy), [5] 1,10-phenanthroline (phen), [6] 2,2Ј-bipyrimidine (bpym), [7] and 2,2Ј-dipyridylamine (dpa) [8] ], and tris(oxalato),…”

[Cr(dmbipy)(ox)2]−: a new bis-oxalato building block for metal assembling. Crystal structures and magnetic properties of XPh4[Cr(dmbipy)(ox)2]·5H2O (X = P and As), {Ba(H2O)2[Cr(dmbipy)(ox)2]2}n·17/2nH2O and {Ag(H2O)[Cr(dmbipy)(ox)2]}n·3nH2O

“…13,14a,b,15,16a,17-21 The topology and dimensionality of the resulted product depends on type of 15,17a,21a Apparently, the AA ligand determines the type of structure that is formed and the coordination modes of the oxalate ligand, as shown in Scheme 2. The coordination number of the alkaline earth cations is eight in the case of Sr(II) (eight oxalate-oxygens), 15 whereas for Ba(II) is ten (nine oxalate-oxygens and one water molecule) for the complex with the bipy ligand 17a and also (eight oxalate-oxygens and two water molecules) for complexes containing phen and À building block with the same ligand, i.e. bipy affords two compounds with different dimensionality, the number of coordinated water molecules being the main factor to establish the dimensionality.…”

“…[13][14][15][16][17][18][19][20][21] Their relative stability, the possibility that they have to act as a ligand towards a second metal ion through the oxalate groups and the supramolecular interactions involving the AA ligand [p-p stacking between the aromatic rings or hydrogen bonds (when AA ¼ dpa)] make them very appropriate tools for metal assembling in crystal engineering. In the present work, we have enlarged this chemistry by preparing the new precursor [Cr(dmbipy)(ox) 2 ]…”

“…À were synthesized where one of the oxalate groups has been replaced by a bidentate [13][14][15] or potentially bis-bidentate 16 nitrogen donor (AA). The self-assembly of these species with uni-or divalent metal ions has afforded a good number of oxalato-bridged heterometallic complexes with different structures, depending on the assembling cation.…”

Hydrothermal Synthesis and Structural Characterization of Two pH‐Controlled Cd–Squarate Coordination Frameworks, [Cd2(C4O4)2.5(H2O)4]·(dpaH)·1.5(H2O) and [Cd(C4O4)(dpa)(OH2)] (dpa = 2,2′‐dipyridylamine)

“…The free, monoprotonated dpaH + cation shown in Figure 1 lengths and bond angles in the dpaH + molecule are comparable to those reported previously. [27] The overall 3D architecture is depicted in Figure 3, and can be described as the self-assembly of 2D anionic Cdsquarate frameworks and free dpaH + cations. A face-sharing double-box shown in Figure 4 (top) is the fundamental building unit for the construction of the 2D anionic MOF.…”