Three new compounds, namely, [Mn(hpcH)(H2O)2]•H2O (1), [Cd(hpcH)(DMF)(H2O)] (2), [Cu(hpcH2)2(H2O)2] (3), (hpcH3=5-hydroxy-1H-pyrazole-3-carboxylic acid), were solvothermally synthesized and characterized in detail. Compounds 1 and 2 are coordination polymers (CPs), exhibit two-dimensional (2D)...

Two new transition metal dicyanamide complexes [Co2(tppz)(dca)4]·CH3CN (1) [tppz=tetra(2‐pyridyl)pyrazine, dca=dicyanamide] and [Co(tptz)(dca)(H2O)](dca) (2) [tptz=2,4,6‐tri(2‐pyridyl)‐1,3,5‐triazine] were synthesized and characterized by single crystal X‐ray diffraction analysis. In 1 each cobalt(II) atom is coordinated to three dca anions and one tppz molecule to form a distorted octahedral geometry, the neigbour two cobalt(II) atoms are bridged by one tppz ligand to form a dimer, then the cobalt(II) atoms in each dimer are joined together to form a ladder chain structure. In 2 the coordination geometry around the central metal is also distorted octahedral, each cobalt(II) atom is coordinated by two dca anions, one tptz molecule and one water ligand to form a cationic part, and the cationic part is linked with the free dca anions via the electrostatic attraction to give an infinite chain structure. Magnetic susceptibility measurement in the range of 2–300 K indicates that there are antiferromagnetic couplings between adjacent metal ions in 1 (T>29 K, (=−9.78 K, C=4.92 cm3·K·mol−1) and ferromagnetic couplings in 2 (T>150 K, (=7.97 K, C=2.59 cm3·K·mol−1) respectively.

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The title complex, [Co(C15H11N3)2](C4N3)2, is built up from discrete [Co(terpy)2]2+ cations (terpy is 2,2′:6′,2′′-terpyridine) and [C(CN)3]− anions. In the cation, the CoII atom is coordinated by two terpy mol­ecules, giving a distorted octa­hedral geometry. The tricyano­methanide anions are not directly coordinated to the CoII atom, but some weak C—H⋯N hydrogen bonds involving the terminal N atoms of the tricyaomethanide ions and the terpyridine H atoms link anions and cations building a three-dimensional network.

In the title complex, [Mn(C4N3)2(C10H8N2O2)2], the MnII atom lies on an inversion center and is coordinated by two 2,2′-bipyridine N,N′-dioxide (dpdo) mol­ecules and two tricyano­methanide (tcm) ligands to form a distorted octa­hedral geometry. Weak inter­molecular C—H⋯O or C—H⋯N hydrogen bonds, involving either the O atom of the dpdo mol­ecule and the pyridyl H atom, or the N atom of the tcm anion and the pyridyl H atom, result in the formation of a three-dimensional network structure.