Crystal structure of 3-(diethylamino)-7-ethyl-2′-((pyridin-3-ylmethylene)amino)-7 H -spiro[chromeno[2,3- b ]phenothiazine-14,1′-isoindolin]-3′-one-methanol, C ₃₈ H ₃₃ N ₅ O ₂ S

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Key Points

Determine the precise three-dimensional crystal structure and unit cell parameters of a newly synthesized spiro-chromenophenothiazine derivative methanol solvate.
Single-crystal X-ray diffraction intensity data collected at a temperature of 293 K.
Structural refinement and space group determination using crystallographic software.
The compound (C38H33N5O2S) crystallizes in the monoclinic space group P21/c with unit cell parameters a = 11.9158(10) Å, b = 12.4994(10) Å, c = 22.4826(2) Å, and β = 97.022(10)°.
The unit cell contains Z = 4 formula units with a total volume of V = 3323.45(5) Å³.
Structure refinement converged to final residual factors of R_gt(F) = 0.0455 and wR_ref(F²) = 0.1274.

Crystallographic analysis reveals the monoclinic structure of a novel spiro-phenothiazine derivative, highlighting its exact molecular geometry.

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Guo et al. (2026) studied this question.

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