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Iron complex
Both Fe 2+ and Fe 3+ generate hydroxide precipitation in ammonia water, and do not generate ammonia complexes
.
Of Fe 3+ solution CI - generating yellow [of FeCl .
[Fe(C 2 O 4 ) 3 ] 3- is yellow-green, and C 2 O 4 2- is a bidentate ligand
.
K 3 [Fe(C 2 O 4 ) 3 ]·3H 2 O is a green crystal that is optically active and decomposes into yellow FeC 2 O 4 ·2H 2 O under light
K 4 [Fe(CN) 6 ]·3H 2 O crystals are yellow, commonly known as yellow blood salt
.
Mixing Fe 3+ with yellow blood salt solution produces a blue product called Prussian blue
K 3 [Fe(CN) 6 ] crystals are red, commonly known as red blood salt
.
Mixing Fe 2+ with the red blood salt solution produces a blue product called Ten's Blue
The experimental results show that Prussian blue and Teng’s blue have the same structure and composition, which can be written as K[FeFe(CN) 6 ], Fe 3+ and Fe 2+ are both on the inner boundary, and the C atom of CN - is coordinated to Fe 2+ .
The N atom coordinates to Fe 3+ , as shown in Figure 16-6
.
The structure of K[FeFe(CN) 6 ] can be regarded as Fe 2+ stacked in a cube, CN -is on the edge of the cube, Fe 3+ is embedded between the N atoms of 2 CN - on the edge of the cube, and the cavity of the cube is filled with K + and H 2 O
[FeFe (CN) Figure 16-6 .
6 ] - a schematic structural diagram
The complex formed by Fe 2+ and 1,10-phenanthroline (denoted as phen) [Fe(phen) 3 ] 2+ (red) is more complex than the complex formed by Fe 3+ [Fe(phen) 3 ] 3 + (blue) stable, thus [of Fe (phen) .
3 ] 2+ reducing ratio of Fe 2+ difference
.
Fe 3+ and PO 4 3- produce light yellow FePO 4 ·2H 2 O precipitation, which is dissolved in phosphoric acid to produce colorless [Fe(HPO 4 ) 3 ] 3- or [Fe(PO 4 ) 3 ] 6-
.
By using Fe 2+ and NO to react under acidic conditions to produce brown [Fe(NO)] 2+ or [Fe(NO)(H 2 O) 5 ] 2+ , NO 3 - and NO 2 - can be identified
.
Concentrated sulfuric acid was added along the wall of the test tube containing the mixed solution of Fe 2+ and NO 3 - , a brown product was formed at the interface of the concentrated sulfuric acid and the aqueous solution, and a brown ring was observed from the side of the test tube
The experimental results show that the magnetic moment of [Fe(NO)] 2+ is 3.
9uB
K 4 [Fe(CN) 6 ] can react with HNO 3 to obtain [Fe(CN) 5 NO] 2- (nitroprusside ion), which is diamagnetic, so its center is Fe 2+ and the ligands are CN - and NO +
.
Ferrocene Fe(C 2 H 5 ) 2 is an orange solid with a sandwich structure (Figure 16-7)
.
Further research has proved that ferrocene is neither an overlapping configuration nor a staggered configuration, but an intermediate between the two
.
Figure 16-7 The structure of ferrocene
Under certain conditions, Fe can react with CO to form mononuclear, dinuclear and multinuclear complexes, such as yellow liquid Fe(CO) 5 and yellow solid Fe 2 (CO) 9 (coplanar octahedral structure, Figure 16-8)
.
Reduction of Fe 2 (CO) 9 with metallic sodium produces Na 2 [Fe(CO) 4 ]
.
