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The hexahydrate converts to the monohydrate and the anhydrous forms at 100 and 250 °C, respectively. [1] CoSO 4 (H 2 O) 7 → CoSO 4 (H 2 O) 6 + H 2 O CoSO 4 (H 2 O) 6 → CoSO 4 (H 2 O) + 5 H 2 O CoSO 4 (H 2 O) → CoSO 4 + H 2 O. The hexahydrate is a metal aquo complex consisting of octahedral [Co(H 2 O) 6] 2+ ions associated with sulfate ...
Bis(2,4-pentanedionato)nickel(II) is prepared by treating nickel nitrate with acetylacetone in the presence of base. The product is the blue-green diaquo complex Ni(CH 3 COCHCOCH 3) 2 (H 2 O) 2. [9] Ni(NO 3) 2 + 2 CH 3 COCH 2 COCH 3 + 2 H 2 O + 2 NaOH → Ni(CH 3 COCHCOCH 3) 2 (H 2 O) 2 + 2 NaNO 3
The anhydrous sulfate is produced by heating the hydrates above 330 °C. X-ray crystallography measurements show that NiSO 4 ·6H 2 O consists of the octahedral [Ni(H 2 O) 6] 2+ ions. These ions in turn are hydrogen bonded to sulfate ions. [5] Dissolution of the salt in water gives solutions containing the aquo complex [Ni(H 2 O) 6] 2+.
The anhydrous material and dihydrate Mn(CH 3 CO 2) 2 ·2H 2 O are coordination polymers. The dihydrate has been characterized by X-ray crystallography. Each Mn(II) center is surrounded by six oxygen centers provided by aquo ligands and acetates. Subunit of the structure of the dihydrate of manganese(II) acetate. [5]
Applications include their use as NMR "shift reagents" and as catalysts for organic synthesis, and precursors to industrial hydroformylation catalysts. C 5 H 7 O − 2 in some cases also binds to metals through the central carbon atom; this bonding mode is more common for the third-row transition metals such as platinum(II) and iridium(III).
For example, solutions of the hydrates react with two molar equivalents of [(C 2 H 5) 4 N]Cl to give the salt [(C 2 H 5) 4 N] 2 [FeCl 4]. [10] The anhydrous FeCl 2, which is soluble in THF, [2] is a standard precursor in organometallic synthesis. FeCl 2 is used to generate NHC complexes in situ for cross coupling reactions. [11]
Like other iron oxalates, ferrous oxalates feature octahedral Fe centers. The dihydrate FeC 2 O 4 (H 2 O) x is a coordination polymer, consisting of chains of oxalate-bridged ferrous centers, each with two aquo ligands. [3] When heated to 120 °C, the dihydrate dehydrates, and the anhydrous ferrous oxalate decomposes near 190 °C. [4]
Anhydrous Cu(NO 3) 2 is one of the few anhydrous transition metal nitrates. [9] It cannot be prepared by reactions containing or producing water. Instead, anhydrous Cu(NO 3) 2 forms when copper metal is treated with dinitrogen tetroxide: [6] Cu + 2 N 2 O 4 → Cu(NO 3) 2 + 2 NO