Synthesis and structure of the two-dimensional bimetallic oxide [H4tphz]3[{Zn2(tphz)(H2O)4}{Mo5O15(O3PCH2CH2PO3)}4]·14H2O: the hydrothermal conversion of tetra-2-pyridylpyrazine to tetrapyrido [2,3-a:3′,2′-c:2″,3″-h:3‴,2‴-j]phenazine (tphz)

Syntheses and characterization of phosphonates and diphosphonates of molybdenum, A4[(MoO3)5(O3PR)2]·xH2O, A2[Mo2O5(O3PR)2] and A2[Mo2O5(O3P-R-PO3)] (A = K, Rb, Cs, Tl, NH4)

Cs₄[(MoO₃)₅(O₃PPh)₂]·6H₂O and K_1.5(H₃O)_0.5[Mo₂O₅(O₃PPh)₂] are molecular and non-molecular phenylphosphonates of molybdenum that contain discrete [(MoO₃)₅(O₃PPh)₂]⁴⁻ and layered [Mo₂O₅(O₃PPh)₂]²⁻ anions respectively.

Bis(2,3,5,6-tetra-2-pyridyl-pyrazine-κN,N,N)nickel(II) dithio-cyanate dihydrate

In the title compound, [Ni(C₂₄H₁₆N₆)₂](NCS)₂·2H₂O, the central Ni^II ion is octahedrally coordinated by six N atoms of two tridentate 2,3,5,6-tetra-2-pyridyl­pyrazine ligands (tppz). Two thio­cyanate anions act as counter-ions and two water mol­ecules act as solvation agents. O—H⋯N hydrogen bonds are observed in the crystral structure.

Bis(2,3,5,6-tetra-2-pyridylpyrazine-κN,N,N)iron(II) bis-(dicyanamidate) 4.5-hydrate

In the title compound, [Fe(C(24)H(16)N(6))(2)][N(CN)(2)](2)·4.5H(2)O, the central iron(II) ion is hexa-coordinated by six N atoms of two tridentate 2,3,5,6-tetra-2-pyridylpyrazine (tppz) ligands. Two dicyanamide anions [dca or N(CN)(2) (-)] act as counter-ions, and 4.5 water mol-ecules act as solvation agents. The structure contains isolated cationic iron(II)-tppz complexes and the final neutrality is obtained with the two dicyanamide anions. One of the dicyanamide anions and a water mol-ecule are disordered with an occupancy ratio of 0.614 (8):0.386 (8). O-H⋯O, O-H⋯N and C-H⋯O hydrogen bonds involving dca, water and tppz mol-ecules are observed.

Inorganic−Organic Framework Structures; M(II) Ethylenediphosphonates (M = Co, Ni, Mn) and a Mn(II) Ethylenediphosphonato-phenanthroline

The reaction of nickel, cobalt, and manganese with 1,2-ethylenediphosphonic acid or 1,2-ethylenediphosphonic acid and 1,10-phenanthroline under hydrothermal conditions resulted in the pillared layered structures Co2(H2O)2(O3PC2H4PO3) (I) and Ni2(H2O)2(O3PC2H4PO3) (II), which are isostructural to a zinc phase that has previously been characterized by X-ray powder methods. In addition, a 1D chain structure, Mn(HO3P(CH2)2PO3H)(H2O)2(C12H8N2) (III), and a pillared layered structure, Mn(HO3P(CH2)2PO3H) (IV), were obtained. The structures of these phases were solved by single-crystal X-ray diffraction methods. The crystallographic data are as follows: compound I P21/n (No. 14), a = 5.6500(11) A, b = 4.7800(10) A, c = 15.330(3) A, beta = 98.50(3) degrees, V = 409.47(14) A3, Z = 2; compound II P21/n (No. 14), a = 5.5807(11) A, b = 4.7205(9) A, c = 15.250(3) A, beta = 98.55(3) degrees, V = 397.28(13) A3, Z = 2; compound III C2/c (No. 15), a = 12.109(2) A, b = 15.328(3) A, c = 9.848(2) A, beta = 108.88(3) degrees, V = 1729.5(6) A3, Z = 4; compound IV P (No. 2), a = 5.498(5) A, b = 7.715(6) A, c = 8.093(7) A, alpha = 82.986(12) degrees, beta = 75.565(12) degrees, gamma = 80.582(12)degrees, V = 326.7(5) A3, Z = 2. Magnetic measurements show antiferromagnetic behavior below TN = 7 K for I and 13 K for II.