Synthesis, Characterization, and Catalytic Studies of Mn(III)-Schiff Base-Dicyanamide Complexes: Checking the Rhombicity Effect in Peroxidase Studies

Table 6

Peroxidase activity for complexes 1–22, axial and equatorial crystal distances around the manganese ion for each complex with solved crystallographic structure, resulting tetragonal elongation, and corresponding reference.

Complex	Crystal distances		Tetragonal elongation	Peroxidase activity	Reference
	Mn-	Mn-
1	2.28	1.870	1.22	33 ± 2	This work
2 [MnL^2(D)(DCA)](D)	un.	un.	un.	53 ± 3	This work
3 [MnL^3(D)(DCA)]	un.	un.	un.	1.9 ± 0.4	This work
4 [MnL^4(D)2(DCA)2]	2.303	1.885	1.225	37 ± 2	[16]
5 [MnL^5(D)2](NO3)(D)	2.326	1.872	1.243	34 ± 3	[22]
6 [MnL^5(D)Cl](D)2.5	2.318	1.878	1.234	31 ± 2	[15]
7 [MnL^5(D)2](ClO4)	2.314	1.865	1.24	19 ± 2	[23]
8 [MnL^6(D)2](NO3)(D)	2.373	1.862	1.27	50 ± 3	[15]
9 [MnL^7(D)2](NO3)(D)	2.263	1.880	1.203	32 ± 1	[22]
10 [MnL^8(D)2](NO3)(D)	2.271	1.870	1.214	33 ± 1	[24]
11 [MnL^1(D)2](ClO4)	2.36	1.851	1.27	30 ± 3	[23]
12A [MnL^2(D)2](NO3)(D)	2.246	1.871	1.200	29 ± 1	[15]
12B [MnL^2(D)(D2)](NO3)	2.258	1.879	1.202	29 ± 1	[15]
13 [MnL^2(D)(OAc)](D)	2.282	1.893	1.205	33 ± 1	[15]
14A [MnL^2(D)(O2CEt)]	2.308	1.869	1.235	28 ± 2	[14]
14B [MnL^2(D)(O2CEt)]	2.338	1.876	1.246	28 ± 2	[14]
15 [MnL^2(D)(O2CPe)]	2.339	1.865	1.254	39 ± 2	[14]
16 [MnL^9(D)2](NO3)(D)2	2.25	1.872	1.202	18 ± 1	[15]
17 [MnL^10(D)2](NO3)(D)2	2.243	1.889	1.187	2.0 ± 0.4	[24]
18 [MnL^11(D)(D2)](ClO4)	2.203	1.863	1.183	3.2 ± 0.4	[25]
19 [MnL^12(D)2](ClO4)(D)	2.22	1.88	1.181	2.4 ± 0.4	[26]
20 [MnL^13(D)2](ClO4)(D)	2.21	1.90	1.163	2.1 ± 0.4	[27]
21 [MnL^14(D)2](NO3)(D)2	2.206	1.904	1.159	1.1 ± 0.3	[22]
22 [MnL^15(D)2](NO3)(D)2	2.258	1.888	1.196	1.8 ± 0.3	[24]

Tetragonal elongation expressed as the ratio between the manganese-axial oxygen distances and the manganese-equatorial oxygen distances. Peroxidase activity expressed as percentage of conversion of ABTS to ABTS^•+ measured 10 min after mixing the solutions; D = H₂O or other solvent molecule (such as CH₃OH); un.: unavailable (structure not solved).