C:Corrosive;10139-47-6Relevant articles and documents
Preparation of stable and metastable coordination compounds: Insight into the structural, thermodynamic, and kinetic aspects of the formation of coordination polymers
Naether, Christian,Bhosekar, Gaurav,Jess, Inke
, p. 8079 - 8087 (2007)
The reaction of Znl2 and pyrimidine in acetonitrile results in the formation of the 1:2 compound Znl2(pyrimidine)2 (1), which consists of discrete tetrahedral building blocks. Slow heating of 1 at 1°C/min leads to its transformation into the ligand-deficient intermediate 1:1 compound Znl2(pyrimidine) (3), which upon further heating decomposes into the most ligand-deficient 2:1 compound (Znl2) 2(pyrimidine) (4). In contrast, the 2:3 compound (Znl 2)2(pyrimidine)3 (2) is formed as an intermediate by decomposing 1 using a faster heating rate of 8°C/min. Compound 2 consists of oligomeric units in which each Znl2 unit is coordinated by two iodine atoms and one bridging and one terminal pyrimidine ligand. The crystal structure of compound 3 is built up of Znl2 units, which are connected by the ligands into chains. For the thermal transformation of 1 into 3 via 2 as the intermediate, a smooth reaction pathway is found in the crystal structure, for which only small translational and rotational changes are needed. The metastable solvated compound (Znl 2)(pyrimidine)(acetonitrile)0.25 (5) consisting of (Znl2)4(pyrimidine)4 rings is obtained by quenching the reaction of Znl2 and pyrimidine in acetonitrile using an antisolvent. On heating, 5 decomposes into a new polymorphic 1:1 compound 6, which consists of (Znl2)(pyrimidine) chains. On further heating, 6 transforms into a third polymorphic 1:1 compound 7, which consists of (Znl 2)3(pyrimidine)3 rings, and finally into the 1:1 compound 3. Solvent-mediated conversion experiments reveal that compounds 1-4 are thermodynamically stable, whereas compounds 5-7 are metastable. Time-dependent crystallization experiments unambiguously show that compound 7 is formed by kinetic control and transforms within minutes into compound 6, which finally transforms into 3. Compound 3 represents the thermodynamically most stable 1:1 modification, whereas compounds 6 and 7 are metastable. The different compounds obtained by thermal decomposition and by crystallization from solution represent a snapshot of the species in solution and thus provide insight into the formation of coordination compounds.
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Parsons, L. B.
, p. 1830 - 1835 (1925)
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Partington, J. R.,Torto, F. G.
, (1948)
Synthesis and molecular structure of two zinc complexes of 1,2-bis[(trimethylsilyl)imino]acenaphthene
Fedushkin, Igor L.,Skatova, Alexandra A.,Eremenko, Olga V.,Hummert, Markus,Schumann, Herbert
, p. 1739 - 1742 (2007)
The reaction of 1,2-bis[(trimethylsilyl)imino]acenaphthene (1, tms-BIAN) with ZnCl2 and ZnI2 in THF and Et2O afford (tms-BIAN)ZnCl2 (2) and (tms-BIAN)ZnI2 (3), respectively. The compounds 2 and 3 were characterized by IR- and NMR spectroscopy as well as by single crystal X-ray analysis.
Revealing the structural chemistry of the group 12 halide coordination compounds with 2,2′-bipyridine and 1,10-phenanthroline
Swiatkowski, Marcin,Kruszynski, Rafal
, p. 642 - 675 (2017/02/05)
The coordination compounds of group 12 halides with 2,2′-bipyridine (bpy) and 1,10-phenanthroline (phen), 2[CdF2(bpy)2]·7H2O (1), [ZnI(bpy)2]+·I3 ? (2), [CdI2(bpy)2] (3), [Cd(SiF6)H2O(phen)2]·[Cd(H2O)2(phen)2]2+·F–·0.5(SiF6)2–·9H2O (4), [Hg(phen)3]2+·(SiF6)2–·5H2O (5), [ZnBr2(phen)2] (6), 6[Zn(phen)3]2+·12Br–·26H2O (7) and [ZnI(phen)2]+·I– (8), have been synthesized and characterized by X-ray crystallography, IR spectroscopy, elemental and thermal analysis. Structural investigations revealed that metal : ligand stoichiometry in the inner coordination sphere is 1 : 2 or 1 : 3. A diversity of intra- and intermolecular interactions exists in structures of 1–8, including the rare halogen?halogen and halogen?π interactions. The thermal and spectroscopic properties were correlated with the molecular structures of 1–8. Structural review of all currently known coordination compounds of group 12 halides with bpy and phen is presented.
STABILIZED COMPOSITIONS AND METHODS OF MANUFACTURE
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Paragraph 0026, (2014/09/30)
A method for stabilization of potent alkanone-heterocyclic flavorants in dry powder form is provided. Coordination of alkanone-heterocyclic flavorants to transition metal salts results in the formation of stable crystalline complexes, which upon hydration release the free flavorant. Food and topping products containing the stabilized alkanone-heterocyclic flavorant are provided as are methods for stabilizing the alkanone-heterocyclic flavorant.
