Abstract
Four 3d–4f heterometallic coordination polymers, [Cu3(IDA)6Ln2]·n(H2O) [IDA= iminodiacetate dianion; Ln=Gd, n=3 (1); Ln=Nd, n=6 (2); Ln=Sm, n=6 (3)] and [Cu(Cl)(NTA)Sm(H2O)6]·(ClO4)·(H2O) (4) [NTA=nitrilotriacetate trianion], have heen synthesized and characterized by single crystal X-ray diffraction analysis. Complexes 1–3 are isomorphous, showing a 3D coordination framework having tubular channels filled by lattice water molecules running parallel to the c axis. Whereas complex 4 is a 1D polymer of alternating copper and samarium ions connected by NTA, and the chains get involved in H-bonding interactions resulting in a 3D network. A low temperature magnetic study reveals ferromagnetic interactions for complex 1. Thermogravimetric and X-ray powder diffraction analyses of 1, 2 and 3 show that the covalently bonded 3D network remains almost unaffected after deaquation.
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