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The synthesis, X-ray structure and variable-temperature magnetic study of new compounds of formulaPPh4[Cr(dmbipy)(ox)2]$5H2O (1), AsPh4[Cr(dmbipy)(ox)2]$5H2O (2),{Ba(H2O)2[Cr(dmbipy)(ox)2]2}n$17/2nH2O (3) and {Ag(H2O)[Cr(dmbipy)(ox)2]}n$3nH2O (4) (PPh4+¼ tetraphenylphosphonium cation; AsPh4+¼ tetraphenylarsonium cation; dmbipy ¼ 4,40-dimethyl-2,20-bipyridine; ox2 ¼ oxalate dianion) are reported herein. The isomorphous compounds 1 and 2 aremade up of discrete [Cr(dmbipy)(ox)2] anions, XPh4+cations [X ¼ P (1) and As (2)] and uncoordinatedwater molecules. The chromium environment in 1 and 2 is distorted octahedral with Cr–O and Cr–Nbond distances varying in the ranges 1.950(2)–1.9782(12) and 2.047(3)–2.0567(14) A˚, respectively. Theangles subtended at the chromium atom by the two bidentate oxalate ligands cover the range 82.58(10)–83.11(5) , and they are somewhat greater than those concerning the chelating dmbipy [79.04(10) (1) and79.24(5) (2)]. The [Cr(dmbipy)(ox)2] unit of 1 and 2 also occurs in 3 and 4 but it adopts differentcoordination modes. It acts as a chelating ligand through its two oxalate groups towards the divalentbarium cations in 3 affording neutral chains with diamond-shaped units sharing the barium atoms,while the two other corners are occupied by two crystallographically independent chromium atoms.The barium atom in 3 is coordinated by eight oxygen atoms from four oxalate groups and two aqualigands. The structure of 4 consists of neutral bimetallic layers where the [Cr(dmbipy)(ox)2] unit acts asa ligand towards the univalent silver(I) cation through its two oxalate groups, one of them beingbidentate and the other bidentate/monodentate (outer). Each silver atom is six-coordinated witha water molecule and ve oxygen atoms from three oxalate groups building a highly distortedoctahedral environment. Magnetic susceptibility measurements for 1–4 in the temperature range 1.9–300 K show the occurrence of weak ferro- (1 and 2) and antiferromagnetic (3 and 4) interactions whichare mediated by p–p stacking between dmbipy ligands through the spin polarization mechanism. Acomparative study of the potentiality of the [Cr(AA)(ox)2] unit (AA ¼ bidentate nitrogen donor) asa building bl

crystengcomm

[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