. 2019 Apr 23;24(8):1598. doi: 10.3390/molecules24081598

Table 7.

Comparison of bond distances (Å) of metal complexes of diacetylcurcumin and acetylacetonates.

Compounds	M-O (Å)	Melting Point	Geometry
(DAC)₂Mg (2)	Mg(1)-O(1) 2.022 Mg(1)-O(2) 2.053	245.6 °C	octahedral
acac-Mg	Mg(1)-O(1) 2.040 Mg(1)-O(2) 2.027	265 °C	octahedral
(DAC)₂Zn (3)	Zn(1)-O(1) 2.021 Zn(1)-O(2) 1.987 Zn(1)-O(9) 2.031 Zn(1)-O(10) 1.991	247.7 °C	trigonal bipyramid
acac-Zn	Zn(1)-O(11) 2.002 Zn(1)-O(12) 1.971 Zn(1)-O(21) 2.008 Zn(1)-O(22) 2.096	136.5 °C	trigonal bipyramid
(DAC)₂Cu (4)	Cu(1)-O(1) 1.906 Cu(1)-O(2) 1.900 Cu(1)-O(9) 1.916 Cu(1)-O(10) 1.913	242.5 °C	square planar
acac-Cu	Cu(1)-O(1) 1.914 Cu(1)-O(2) 1.912	285.5 °C	square planar
(DAC)₂Mn (5)	Mn(1)-O(1) 2.108 Mn(1)-O(2) 2.132	191 °C	octahedral
acac-Mn	Mn(1)-O(1) 2.150 Mn(1)-O(2) 2.129	249 °C	octahedral