Add time:10/01/2019         Source:infona.pl

Hydrothermal reaction of cadmium nitrate and the conformationally flexible dipyridine 3‐pyridylnicotinamide (3‐pna) with a substituted succinic acid derivative afforded a pair of crystalline coordination polymers, whose dimensionality depends critically on the number of 2‐position methyl groups on the acid precursor. The two new crystalline extended metal‐organic solids were structurally characterized by single‐crystal X‐ray diffraction. {[Cd(msuc)(3‐pna)]·2H2O}n (1) (msuc = 2‐methylsuccinate) manifests [Cd(msuc)]n layer motifs that contain {Cd2(OCO)2} dimeric units, linked into a non‐interpenetrated 3D 6‐connected pcu network by tethering anti‐conformation 3‐pna ligands. {[Cd2(dmsuc)2(3‐pna)2]·1.5H2O}n (2) (dmsuc = 2,2‐dimethylsuccinate) shows 1D [Cd(dmsuc)]n ribbons containing {Cd2O2} dimeric units. In turn these are connected into 2D [Cd2(dmsuc)2(3‐pna)2]n layer motifs via anti‐conformation 3‐pna linkers; the layers are decorated by pendant monodentate 3‐pna ligands. The subtle steric variance alters the supramolecular environment for co‐crystallized water molecule tetramers, with a discrete chain seen in 1 and a cyclic ring in 2. Thermal and luminescent properties of these two new materials are also presented.

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