metal-organic compounds
Bis[2-methoxy-6-(phenyliminiomethyl)phenolate-κ2O,O′]bis(thiocyanato-κN)manganese(II)
aCollege of Chemistry and Life Science, Zhejiang Normal University, Jinhua, Zhejiang 321004, People's Republic of China, and bXingzhi College, Zhejiang Normal University, Jinhua, Zhejiang 321004, People's Republic of China
*Correspondence e-mail: sky53@zjnu.cn
The MnII atom in the title complex, [Mn(NCS)2(C14H13NO2)2], lies on a center of inversion in a MnO4N2 octahedral geometry. The Schiff base is present in its zwitterionic form and is O,O′-chelated to the metal atom. The imino N atom is protonated and is involved in an intramolecular hydrogen bond with the phenolate O atom.
Related literature
For Schiff base ligands derived from o-vanillin and aniline and their rare earth complexes, see: Li et al. (2008); Liu et al. (2009); Xian et al. (2008); Zhao et al. (2005, 2007).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2006); cell SAINT (Bruker, 2006); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.
Supporting information
10.1107/S1600536811009330/ng5130sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811009330/ng5130Isup2.hkl
Reagents and solvents used were of commercially available quality and without purified before using. The Schiff base ligand 2-(phenyliminomethyl)-6-methoxyphenol was synthesized from condensation of o-vanillin and aniline. The title compound was synthesized by traditional method. 1 mmol HL ligand was dissolved in ethanol, then 0.5 mmol Mn(NO3)2.6H2O (in ethanol) was added to the upper solution. The mixture solution was stirred for 2 h at room temperature. Furthermore, 1 mmol NH4SCN (dissolved in ethanol) was added. The mixture was stirred again for 8 h at room temperature. At last, deposit was filtered out and the reddish-brown solution was kept in the open air. The red crystal was obtained after several days.
The structure was solved by
and successive Fourier difference synthesis. The H atoms bonded to C and N atoms were positioned geometrically and refined using a riding model [aliphatic C—H = 0.96 Å (Uiso(H) = 1.5Ueq(C)), aromatic C—H = 0.93 Å (Uiso(H) = 1.2Ueq(C)) and N—H = 0.86 Å with Uiso(H) = 1.2Ueq(N).Data collection: APEX2 (Bruker, 2006); cell
SAINT (Bruker, 2006); data reduction: SAINT (Bruker, 2006); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).[Mn(NCS)2(C14H13NO2)2] | Z = 1 |
Mr = 625.61 | F(000) = 323 |
Triclinic, P1 | Dx = 1.457 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 9.0204 (2) Å | Cell parameters from 4271 reflections |
b = 9.3070 (2) Å | θ = 2.2–25.0° |
c = 9.4087 (2) Å | µ = 0.65 mm−1 |
α = 87.417 (1)° | T = 296 K |
β = 82.010 (1)° | Block, red |
γ = 65.693 (1)° | 0.29 × 0.17 × 0.05 mm |
V = 712.81 (3) Å3 |
Bruker APEXII area-detector diffractometer | 2509 independent reflections |
Radiation source: fine-focus sealed tube | 2233 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.022 |
ϕ and ω scans | θmax = 25.0°, θmin = 2.2° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −10→10 |
Tmin = 0.877, Tmax = 0.970 | k = −11→11 |
9483 measured reflections | l = −11→11 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.028 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.077 | H-atom parameters constrained |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0423P)2 + 0.1242P] where P = (Fo2 + 2Fc2)/3 |
2509 reflections | (Δ/σ)max = 0.001 |
188 parameters | Δρmax = 0.17 e Å−3 |
2 restraints | Δρmin = −0.24 e Å−3 |
[Mn(NCS)2(C14H13NO2)2] | γ = 65.693 (1)° |
Mr = 625.61 | V = 712.81 (3) Å3 |
Triclinic, P1 | Z = 1 |
a = 9.0204 (2) Å | Mo Kα radiation |
b = 9.3070 (2) Å | µ = 0.65 mm−1 |
c = 9.4087 (2) Å | T = 296 K |
α = 87.417 (1)° | 0.29 × 0.17 × 0.05 mm |
β = 82.010 (1)° |
Bruker APEXII area-detector diffractometer | 2509 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 2233 reflections with I > 2σ(I) |
Tmin = 0.877, Tmax = 0.970 | Rint = 0.022 |
9483 measured reflections |
R[F2 > 2σ(F2)] = 0.028 | 2 restraints |
wR(F2) = 0.077 | H-atom parameters constrained |
S = 1.06 | Δρmax = 0.17 e Å−3 |
2509 reflections | Δρmin = −0.24 e Å−3 |
188 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
Mn1 | 0.0000 | 0.5000 | 0.5000 | 0.03697 (13) | |
S1 | 0.00911 (6) | 0.11697 (6) | 0.14672 (6) | 0.05653 (16) | |
O1 | 0.24701 (13) | 0.46530 (13) | 0.41948 (12) | 0.0385 (3) | |
N1 | 0.48105 (16) | 0.51194 (15) | 0.24678 (14) | 0.0354 (3) | |
H1A | 0.3779 | 0.5397 | 0.2737 | 0.043* | |
O2 | 0.16157 (14) | 0.30666 (15) | 0.63303 (13) | 0.0465 (3) | |
C7 | 0.36297 (19) | 0.35112 (18) | 0.47429 (16) | 0.0320 (3) | |
C13 | 0.32723 (19) | 0.25949 (19) | 0.58901 (17) | 0.0361 (4) | |
C9 | 0.53201 (19) | 0.31088 (19) | 0.42564 (17) | 0.0354 (4) | |
C15 | 0.01407 (19) | 0.2348 (2) | 0.26679 (19) | 0.0401 (4) | |
C8 | 0.58045 (19) | 0.3952 (2) | 0.31424 (18) | 0.0389 (4) | |
H8A | 0.6924 | 0.3648 | 0.2870 | 0.047* | |
C4 | 0.5244 (2) | 0.59880 (19) | 0.13313 (17) | 0.0358 (4) | |
C3 | 0.6852 (2) | 0.5520 (2) | 0.06908 (19) | 0.0451 (4) | |
H3A | 0.7678 | 0.4615 | 0.0990 | 0.054* | |
C12 | 0.4481 (2) | 0.1394 (2) | 0.64754 (19) | 0.0452 (4) | |
H12A | 0.4207 | 0.0812 | 0.7213 | 0.054* | |
C5 | 0.4016 (2) | 0.7315 (2) | 0.08693 (19) | 0.0441 (4) | |
H5A | 0.2935 | 0.7612 | 0.1290 | 0.053* | |
C2 | 0.7210 (2) | 0.6418 (2) | −0.0399 (2) | 0.0537 (5) | |
H2A | 0.8288 | 0.6114 | −0.0832 | 0.064* | |
N2 | 0.01391 (19) | 0.3211 (2) | 0.35072 (18) | 0.0554 (4) | |
C10 | 0.6546 (2) | 0.1866 (2) | 0.4902 (2) | 0.0475 (4) | |
H10A | 0.7647 | 0.1625 | 0.4585 | 0.057* | |
C1 | 0.5992 (3) | 0.7757 (2) | −0.0853 (2) | 0.0551 (5) | |
H1B | 0.6248 | 0.8357 | −0.1583 | 0.066* | |
C11 | 0.6141 (2) | 0.1025 (2) | 0.5974 (2) | 0.0514 (5) | |
H11A | 0.6960 | 0.0202 | 0.6380 | 0.062* | |
C6 | 0.4396 (2) | 0.8202 (2) | −0.0220 (2) | 0.0529 (5) | |
H6A | 0.3570 | 0.9103 | −0.0526 | 0.063* | |
C14 | 0.1088 (3) | 0.2163 (3) | 0.7377 (3) | 0.0723 (7) | |
H14A | 0.1511 | 0.2175 | 0.8256 | 0.108* | |
H14B | 0.1487 | 0.1096 | 0.7035 | 0.108* | |
H14C | −0.0089 | 0.2609 | 0.7546 | 0.108* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Mn1 | 0.02590 (19) | 0.0477 (2) | 0.0377 (2) | −0.01664 (16) | −0.00189 (14) | 0.00535 (15) |
S1 | 0.0503 (3) | 0.0525 (3) | 0.0652 (3) | −0.0210 (2) | 0.0012 (2) | −0.0120 (2) |
O1 | 0.0265 (6) | 0.0450 (7) | 0.0419 (6) | −0.0142 (5) | −0.0032 (5) | 0.0135 (5) |
N1 | 0.0272 (7) | 0.0401 (8) | 0.0386 (7) | −0.0153 (6) | 0.0018 (6) | 0.0017 (6) |
O2 | 0.0352 (6) | 0.0583 (8) | 0.0466 (7) | −0.0229 (6) | −0.0025 (5) | 0.0208 (6) |
C7 | 0.0309 (8) | 0.0344 (8) | 0.0321 (8) | −0.0152 (7) | −0.0033 (6) | 0.0011 (6) |
C13 | 0.0345 (9) | 0.0419 (9) | 0.0347 (8) | −0.0188 (7) | −0.0038 (7) | 0.0027 (7) |
C9 | 0.0306 (8) | 0.0381 (9) | 0.0355 (8) | −0.0132 (7) | −0.0018 (6) | 0.0021 (7) |
C15 | 0.0272 (8) | 0.0426 (10) | 0.0477 (10) | −0.0136 (7) | 0.0009 (7) | 0.0048 (7) |
C8 | 0.0263 (8) | 0.0460 (10) | 0.0418 (9) | −0.0139 (7) | 0.0010 (7) | 0.0012 (7) |
C4 | 0.0367 (9) | 0.0379 (9) | 0.0359 (8) | −0.0199 (7) | 0.0000 (7) | −0.0004 (7) |
C3 | 0.0359 (9) | 0.0495 (11) | 0.0469 (10) | −0.0175 (8) | 0.0016 (8) | 0.0083 (8) |
C12 | 0.0488 (11) | 0.0445 (10) | 0.0409 (9) | −0.0184 (8) | −0.0078 (8) | 0.0120 (8) |
C5 | 0.0382 (10) | 0.0441 (10) | 0.0468 (10) | −0.0154 (8) | −0.0008 (8) | 0.0022 (8) |
C2 | 0.0426 (10) | 0.0636 (12) | 0.0546 (11) | −0.0263 (10) | 0.0068 (9) | 0.0085 (9) |
N2 | 0.0465 (9) | 0.0663 (11) | 0.0562 (10) | −0.0280 (8) | 0.0035 (8) | −0.0098 (8) |
C10 | 0.0306 (9) | 0.0516 (11) | 0.0512 (11) | −0.0089 (8) | −0.0038 (8) | 0.0063 (8) |
C1 | 0.0620 (13) | 0.0575 (12) | 0.0500 (11) | −0.0318 (11) | −0.0014 (9) | 0.0142 (9) |
C11 | 0.0422 (10) | 0.0481 (11) | 0.0531 (11) | −0.0073 (8) | −0.0115 (8) | 0.0139 (9) |
C6 | 0.0541 (12) | 0.0450 (11) | 0.0542 (11) | −0.0160 (9) | −0.0076 (9) | 0.0124 (9) |
C14 | 0.0556 (13) | 0.0807 (16) | 0.0782 (15) | −0.0333 (12) | 0.0049 (11) | 0.0363 (12) |
Mn1—O1 | 2.1455 (10) | C4—C5 | 1.379 (2) |
Mn1—O1i | 2.1455 (10) | C4—C3 | 1.384 (2) |
Mn1—N2 | 2.1794 (16) | C3—C2 | 1.381 (2) |
Mn1—N2i | 2.1794 (16) | C3—H3A | 0.9300 |
Mn1—O2 | 2.2525 (12) | C12—C11 | 1.406 (3) |
Mn1—O2i | 2.2525 (12) | C12—H12A | 0.9300 |
S1—C15 | 1.6270 (19) | C5—C6 | 1.381 (3) |
O1—C7 | 1.2942 (19) | C5—H5A | 0.9300 |
N1—C8 | 1.297 (2) | C2—C1 | 1.378 (3) |
N1—C4 | 1.420 (2) | C2—H2A | 0.9300 |
N1—H1A | 0.8600 | C10—C11 | 1.351 (3) |
O2—C13 | 1.3790 (19) | C10—H10A | 0.9300 |
O2—C14 | 1.424 (2) | C1—C6 | 1.376 (3) |
C7—C9 | 1.423 (2) | C1—H1B | 0.9300 |
C7—C13 | 1.429 (2) | C11—H11A | 0.9300 |
C13—C12 | 1.360 (2) | C6—H6A | 0.9300 |
C9—C8 | 1.409 (2) | C14—H14A | 0.9600 |
C9—C10 | 1.414 (2) | C14—H14B | 0.9600 |
C15—N2 | 1.151 (2) | C14—H14C | 0.9600 |
C8—H8A | 0.9300 | ||
O1—Mn1—O1i | 180.0 | C5—C4—C3 | 120.42 (16) |
O1—Mn1—N2 | 90.41 (5) | C5—C4—N1 | 118.22 (14) |
O1i—Mn1—N2 | 89.59 (5) | C3—C4—N1 | 121.36 (15) |
O1—Mn1—N2i | 89.59 (5) | C2—C3—C4 | 119.02 (17) |
O1i—Mn1—N2i | 90.41 (5) | C2—C3—H3A | 120.5 |
N2—Mn1—N2i | 180.00 (7) | C4—C3—H3A | 120.5 |
O1—Mn1—O2 | 74.23 (4) | C13—C12—C11 | 120.51 (16) |
O1i—Mn1—O2 | 105.77 (4) | C13—C12—H12A | 119.7 |
N2—Mn1—O2 | 88.99 (6) | C11—C12—H12A | 119.7 |
N2i—Mn1—O2 | 91.01 (6) | C4—C5—C6 | 119.83 (16) |
O1—Mn1—O2i | 105.77 (4) | C4—C5—H5A | 120.1 |
O1i—Mn1—O2i | 74.23 (4) | C6—C5—H5A | 120.1 |
N2—Mn1—O2i | 91.01 (6) | C1—C2—C3 | 120.86 (17) |
N2i—Mn1—O2i | 88.99 (6) | C1—C2—H2A | 119.6 |
O2—Mn1—O2i | 180.00 (5) | C3—C2—H2A | 119.6 |
C7—O1—Mn1 | 116.71 (9) | C15—N2—Mn1 | 175.35 (17) |
C8—N1—C4 | 126.92 (14) | C11—C10—C9 | 120.88 (16) |
C8—N1—H1A | 116.5 | C11—C10—H10A | 119.6 |
C4—N1—H1A | 116.5 | C9—C10—H10A | 119.6 |
C13—O2—C14 | 119.03 (14) | C6—C1—C2 | 119.66 (18) |
C13—O2—Mn1 | 114.02 (9) | C6—C1—H1B | 120.2 |
C14—O2—Mn1 | 126.09 (12) | C2—C1—H1B | 120.2 |
O1—C7—C9 | 122.31 (14) | C10—C11—C12 | 120.05 (17) |
O1—C7—C13 | 121.33 (14) | C10—C11—H11A | 120.0 |
C9—C7—C13 | 116.36 (14) | C12—C11—H11A | 120.0 |
C12—C13—O2 | 124.73 (15) | C1—C6—C5 | 120.20 (18) |
C12—C13—C7 | 121.84 (15) | C1—C6—H6A | 119.9 |
O2—C13—C7 | 113.42 (14) | C5—C6—H6A | 119.9 |
C8—C9—C10 | 118.78 (15) | O2—C14—H14A | 109.5 |
C8—C9—C7 | 120.86 (15) | O2—C14—H14B | 109.5 |
C10—C9—C7 | 120.35 (15) | H14A—C14—H14B | 109.5 |
N2—C15—S1 | 178.24 (18) | O2—C14—H14C | 109.5 |
N1—C8—C9 | 125.08 (14) | H14A—C14—H14C | 109.5 |
N1—C8—H8A | 117.5 | H14B—C14—H14C | 109.5 |
C9—C8—H8A | 117.5 | ||
N2—Mn1—O1—C7 | −84.38 (11) | C13—C7—C9—C8 | −179.21 (15) |
N2i—Mn1—O1—C7 | 95.62 (11) | O1—C7—C9—C10 | 179.05 (15) |
O2—Mn1—O1—C7 | 4.46 (10) | C13—C7—C9—C10 | −0.2 (2) |
O2i—Mn1—O1—C7 | −175.54 (10) | C4—N1—C8—C9 | −179.22 (15) |
O1—Mn1—O2—C13 | −4.72 (10) | C10—C9—C8—N1 | −179.53 (16) |
O1i—Mn1—O2—C13 | 175.28 (10) | C7—C9—C8—N1 | −0.5 (3) |
N2—Mn1—O2—C13 | 85.99 (11) | C8—N1—C4—C5 | −172.09 (16) |
N2i—Mn1—O2—C13 | −94.01 (11) | C8—N1—C4—C3 | 8.3 (3) |
O1—Mn1—O2—C14 | −173.90 (17) | C5—C4—C3—C2 | 1.1 (3) |
O1i—Mn1—O2—C14 | 6.10 (17) | N1—C4—C3—C2 | −179.25 (16) |
N2—Mn1—O2—C14 | −83.19 (17) | O2—C13—C12—C11 | −178.46 (16) |
N2i—Mn1—O2—C14 | 96.81 (17) | C7—C13—C12—C11 | 0.8 (3) |
Mn1—O1—C7—C9 | 176.96 (11) | C3—C4—C5—C6 | −1.3 (3) |
Mn1—O1—C7—C13 | −3.79 (19) | N1—C4—C5—C6 | 179.06 (16) |
C14—O2—C13—C12 | −6.3 (3) | C4—C3—C2—C1 | −0.3 (3) |
Mn1—O2—C13—C12 | −176.32 (13) | C8—C9—C10—C11 | 179.98 (17) |
C14—O2—C13—C7 | 174.40 (17) | C7—C9—C10—C11 | 1.0 (3) |
Mn1—O2—C13—C7 | 4.39 (17) | C3—C2—C1—C6 | −0.5 (3) |
O1—C7—C13—C12 | −179.92 (15) | C9—C10—C11—C12 | −0.9 (3) |
C9—C7—C13—C12 | −0.6 (2) | C13—C12—C11—C10 | 0.0 (3) |
O1—C7—C13—O2 | −0.6 (2) | C2—C1—C6—C5 | 0.3 (3) |
C9—C7—C13—O2 | 178.68 (13) | C4—C5—C6—C1 | 0.6 (3) |
O1—C7—C9—C8 | 0.1 (2) |
Symmetry code: (i) −x, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | [Mn(NCS)2(C14H13NO2)2] |
Mr | 625.61 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 296 |
a, b, c (Å) | 9.0204 (2), 9.3070 (2), 9.4087 (2) |
α, β, γ (°) | 87.417 (1), 82.010 (1), 65.693 (1) |
V (Å3) | 712.81 (3) |
Z | 1 |
Radiation type | Mo Kα |
µ (mm−1) | 0.65 |
Crystal size (mm) | 0.29 × 0.17 × 0.05 |
Data collection | |
Diffractometer | Bruker APEXII area-detector diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.877, 0.970 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 9483, 2509, 2233 |
Rint | 0.022 |
(sin θ/λ)max (Å−1) | 0.595 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.028, 0.077, 1.06 |
No. of reflections | 2509 |
No. of parameters | 188 |
No. of restraints | 2 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.17, −0.24 |
Computer programs: APEX2 (Bruker, 2006), SAINT (Bruker, 2006), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
References
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Li, H.-Q., Xian, H.-D., Liu, J.-F. & Zhao, G.-L. (2008). Acta Cryst. E64, m1593–m1594. Web of Science CrossRef IUCr Journals Google Scholar
Liu, J.-F., Liu, J.-L. & Zhao, G.-L. (2009). Acta Cryst. E65, m1385–m1386. Web of Science CrossRef IUCr Journals Google Scholar
Sheldrick, G. M. (1996). SADABS. University of Göttingen, Germany. Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Xian, H.-D., Liu, J.-F., Li, H.-Q. & Zhao, G.-L. (2008). Acta Cryst. E64, m1422. Web of Science CSD CrossRef IUCr Journals Google Scholar
Zhao, G.-L., Shi, X. & Ng, S. W. (2007). Acta Cryst. E63, m267–m268. CSD CrossRef IUCr Journals Google Scholar
Zhao, G.-L., Zhang, P.-H. & Feng, Y.-L. (2005). Chin. J. Inorg. Chem. 21, 421–424. CAS Google Scholar
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For many years, there has been considerable interest in the study of Schiff base compounds due to their biological activity (Zhao et al., 2005). Interested in this field, we have been synthesized several analogous Schiff bases derived from o-vanillin and prepared their transitional and rare metal complexes further. In a few of articles we have reported our partial research results (Zhao et al., 2007; Xian et al. 2008; Li et al. 2008; Liu et al. 2009). Herein, we describe a new Mn(II) complex.
The structure of complex (1) was shown in Fig. 1 and the coordination environment of Mn(II) was shown in Fig. 2. In this complex the Mn(II) is six- coordinated by two N atoms from thiocyanate ions and four O atoms from the Schiff bases (HL), which can be described as a distorted octahedral geometry. There thiocyanate anions coordinate to Mn(II) ion with N atoms occupying the apices and two HL ligands chelate the Mn(II) ion with four O atoms from deprotonated phenol groups and methoxyl groups occupying the equatorial positions. The Mn—O and Mn—N bond distances were listed in Table 1, The distances between Mn(II) and methoxyl O atoms are obvious longer than Mn—O(phenolic) bond distances, which are similar to the analogous complexes (Zhao et al., 2007; Li et al., 2008, Liu et al., 2009).
The hydrogen bonds and π–π weak non-covalent interactions lend stability to the structure. The stacking plot of this compound was shown in Fig. 3. In HL ligand, two protons of phenolic hydroxyl groups considered to have transferred to imine N atoms involve in forming intramolecular hydrogen bonds. The π–π interactions exist both intra and extra molecules between the approximate paralleled participating benzene rings, which may be the primary forces keep the complex molecules packing together.